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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)