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Income Taxes - Additional Durational Information (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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| Income Taxes [Line Items] | |||
| Income before income taxes, income from domestic operations amount | $ 4,693 | $ 4,948 | $ 3,579 |
| Income before income taxes, income from foreign operations amount | $ 7,633 | $ 5,848 | $ 4,802 |
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Federal
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| Income Taxes [Line Items] | |||
| Net operating loss carryforwards expiration date | 2018 | ||
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State
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| Income Taxes [Line Items] | |||
| Net operating loss carryforwards expiration date | 2014 | ||