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Income Taxes (Income Tax Reconciliation) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income (loss) before income taxes [Abstract]                      
United States                 $ 1,713 $ 4,983 $ 5,121
Foreign                 478 1,061 624
Income from continuing operations before income taxes $ 62 $ 813 $ 720 $ 596 $ 832 $ 2,359 $ 1,465 $ 1,388 $ 2,191 $ 6,044 $ 5,745
United States, percent of pre-tax income                 78.20% 82.40% 89.10%
Foreign, percent of pre-tax income                 21.80% 17.60% 10.90%
Total, percent of pre-tax income                 100.00% 100.00% 100.00%
Income Tax Expense (Benefit), Income Tax Reconciliation                      
Federal statutory income tax                 $ 767 $ 2,115 $ 2,011
Goodwill allocated to assets sold                 0 41 18
Sale of foreign subsidiaries                 0 (125) (293)
Foreign rate differential                 (152) (239) (184)
German tax legislation                 0 (103) 0
Change in valuation allowance                 (81) (17) (14)
Federal manufacturing deduction                 0 (77) (81)
State income tax, net of federal benefit                 12 150 180
Other                 1 19 17
Income tax expense                 $ 547 $ 1,764 $ 1,654
Effective Income Tax Rate, Tax Rate Reconciliation                      
Federal statutory income tax, percent                 35.00% 35.00% 35.00%
Goodwill allocated to assets sold, percent                 0.00% 0.70% 0.30%
Sale of foreign subsidiaries, percent                 0.00% (2.10%) (5.10%)
Foreign rate differential, percent                 (6.90%) (3.90%) (3.20%)
German tax legislation, percent                 0.00% (1.70%) 0.00%
Change in valuation allowance, percent                 (3.70%) (0.20%) (0.20%)
Federal manufacturing deduction, percent                 (0.00%) (1.30%) (1.40%)
State income tax, net of federal benefit, percent                 0.60% 2.50% 3.10%
Other, percent                 0.00% 0.20% 0.30%
Effective income tax rate                 25.00% 29.20% 28.80%