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Summary of Significant Accounting Policies Income Statement Impact of Accounting Policy Change (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Change in Accounting Principle [Line Items] |  |  |  |
Cost of goods sold | $ 5,165 | $ 4,779 | $ 17,415 | $ 16,558
Income (loss) from continuing operations before income taxes | 228 | (175) | 3,367 | 3,122
(Benefit from) provision for income taxes on continuing operations | (35) | (135) | 687 | 654
Income (loss) from continuing operations after income taxes | 263 | (40) | 2,680 | 2,468
Income from discontinued operations after income taxes | 25 | 48 | 1,997 | 219
Net income | 288 | 8 | 4,677 | 2,687
As Reported [Member] |  |  |  |
Change in Accounting Principle [Line Items] |  |  |  |
Cost of goods sold | 5,165 | 4,779 | 17,415 | 16,558
Income (loss) from continuing operations before income taxes | 228 | (175) | 3,367 | 3,122
(Benefit from) provision for income taxes on continuing operations | (35) | (135) | 687 | 654
Income (loss) from continuing operations after income taxes | 263 | (40) | 2,680 | 2,468
Income from discontinued operations after income taxes | 25 | 48 | 1,997 | 219
Net income | 288 | 8 | 4,677 | 2,687
As reported under LIFO [Member] |  |  |  |
Change in Accounting Principle [Line Items] |  |  |  |
Cost of goods sold | 5,176 | 4,778 | 17,447 | 16,549
Income (loss) from continuing operations before income taxes | 217 | (174) | 3,335 | 3,131
(Benefit from) provision for income taxes on continuing operations | (38) | (134) | 678 | 657
Income (loss) from continuing operations after income taxes | 255 | (40) | 2,657 | 2,474
Income from discontinued operations after income taxes | 25 | 53 | 1,997 | 227
Net income | 280 | 13 | 4,654 | 2,701
Impact of change in accounting principle [Member] |  |  |  |
Change in Accounting Principle [Line Items] |  |  |  |
(Decrease) Increase to cost of goods sold | (11) | 1 | (32) | 9
(Decrease) Increase to income (loss) from continuing operations before income taxes | 11 | (1) | 32 | (9)
(Decrease) Increase to provision for (benefit from) income taxes on continuing operations | 3 | (1) | 9 | (3)
(Decrease) Increase to income (loss) from continuing operations after income taxes | 8 | 0 | 23 | (6)
(Decrease) Increase to income from discontinued operations after taxes | 0 | (5) | 0 | (8)
(Decrease) Increase to net income | $ 8 | $ (5) | $ 23 | $ (14)

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