Debt - Additional Information (Detail) (USD $)	12 Months Ended
Dec. 31, 2010	Dec. 31, 2011
Debt Disclosure [Line Items]
Debt financing program through the issuance of commercial paper		$ 3,000,000,000
Amounts of commercial paper outstanding	3,000,000,000	750,000,000
Weighted average yield for commercial paper outstanding	0.30%	0.10%
Revolving credit facility established in conjunction with debt financing program		3,000,000,000
Amount outstanding under the credit facility program
Short-term debt	3,465,000,000	1,218,000,000
Estimated fair value of long-term debt		3,200,000,000
1.25% Notes due on May 19, 2014
Debt Disclosure [Line Items]
Secured promissory note, interest rate		1.25%
Effective interest rate		1.258%
2.125% Notes due on May 19, 2016
Debt Disclosure [Line Items]
Secured promissory note, interest rate		2.125%
Effective interest rate		2.241%
3.625% Notes due on May 19, 2021
Debt Disclosure [Line Items]
Secured promissory note, interest rate		3.625%
Effective interest rate		3.734%
Unsecured Senior Notes
Debt Disclosure [Line Items]
Debt instrument, face amount		3,000,000,000
Promissory Notes
Debt Disclosure [Line Items]
Short-term debt	468,000,000	468,000,000
Secured promissory note, maturity date		2012-12
Secured promissory note, interest rate		1.00%
Debt instrument, face amount	$ 468,000,000
Secured promissory note, maturity period	1 year

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Debt Instrument, Maturity, Month and Year

+ References

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- Definition

Debt Instrument Maturity Period

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No definition available.

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- Definition

Maximum US dollar capacity of the commercial paper program.

+ References

No definition available.

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- Definition

Outstanding balance under the commercial paper program.

+ References

No definition available.

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- Definition

Outstanding balance under the revolving credit facility.

+ References

No definition available.

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- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16, 20

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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- Definition

Interest rate stated in the contractual debt agreement.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

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-Name Regulation S-X (SX)

-Number 210

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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-Number 210

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-Name Regulation S-X (SX)

-Number 210

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- Definition

Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of short-term debt outstanding by type or by instrument at that time.

+ References

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-Publisher SEC

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