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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Tax Disclosure [Abstract]    
Earnings before income taxes $ 109 $ 198
Income tax expense computed at United States statutory tax rate 23 69
U.S. foreign income items, net of credits (11) (19)
Foreign government tax incentive 0 (2)
Other 3 (8)
Income tax expense computed at effective worldwide tax rates $ 15 $ 40