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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Tax Disclosure [Abstract]        
Earnings before income taxes $ 268 $ 305 $ 678 $ 806
Income tax (benefit) expense computed at United States statutory tax rate 94 107 237 282
Valuation allowances (releases) (84) (59) (77) (164)
Audits and settlements 7 (3) 1 (35)
U.S. foreign income items, net of credits (17) 4 (70) (6)
Foreign government tax incentive (4) (2) (7) (5)
Other 0 14 (15) (8)
Income tax (benefit) expense computed at effective worldwide tax rates $ (4) $ 61 $ 69 $ 64