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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Income Tax Disclosure [Abstract]        
Earnings before income taxes $ 305 $ 267 $ 806 $ 749
Income tax expense computed at United States statutory tax rate 107 93 282 262
Valuation allowance releases (59) (68) (164) (126)
Audits and settlements (3) 6 (35) 8
U.S. foreign income items, net of credits 4 (18) (6) (32)
Foreign government tax incentive (2) 0 (5) (8)
Other 14 4 (8) 12
Income tax expense computed at effective worldwide tax rates $ 61 $ 17 $ 64 $ 116