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Segment and Geographic Area Information - Schedule of Segment Reporting Information to Consolidated Assets (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Schedule Of Assets By Segment [Line Items] |  |  |  |
Total segment assets | $ 31,912 | $ 32,039 |  |
Elimination of intersegment receivables | (444) | (483) |  |
Cash and cash equivalents | 1,861 | 1,939 | 1,543 | 1,481
Corporate goodwill | 5,170 | 5,157 | 5,028 |
Corporate fixed assets, net | 18,947 | 19,282 |  |
Consolidated assets | 40,179 | 40,120 |  |
Unallocated Amounts (Net of Tax) [Member] |  |  |  |
Schedule Of Assets By Segment [Line Items] |  |  |  |
Cash and cash equivalents | 1,861 | 1,939 |  |
Deferred income taxes | 4,061 | 3,738 |  |
Corporate goodwill | 1,272 | 1,281 |  |
Corporate fixed assets, net | 961 | 935 |  |
LIFO reserve | (770) | (801) |  |
Other | $ 1,326 | $ 1,472 |  |

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