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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Tax Disclosure [Abstract]    
Earnings before income taxes $ 215 $ 207
Income tax expense computed at United States statutory tax rate 75 72
Valuation allowance releases 0 (58)
U.S. foreign income items, net of credits (5) (2)
Foreign government tax incentive (2) (4)
Other (9) 1
Income tax expense computed at effective worldwide tax rates $ 59 $ 9