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Reconciliation of Beginning and Ending Balance of Unrecognized Tax Benefits (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Income Tax Contingency [Line Items] | |||
| Balance at January 1, | $ 2,943 | $ 3,078 | $ 3,242 |
| Additions based on tax positions related to the current year | 116 | 131 | 111 |
| Additions for tax positions of prior years | 250 | 92 | 456 |
| Reductions for tax positions of prior years | (801) | (415) | (644) |
| Settlements | (210) | 100 | (56) |
| Lapses of statutes of limitations | (168) | (43) | (31) |
| Balance at December 31, | $ 2,130 | $ 2,943 | $ 3,078 |
| X | ||||||||||
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- Details
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- Definition
Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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