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Income Taxes - Summary of Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Income Tax Disclosure [Abstract]    
Earnings before income taxes $ 342 $ 109
Income tax (benefit) expense computed at United States statutory tax rate 72 23
Valuation allowances (235) 0
U.S. foreign income items, net of credits 7 (11)
Other 24 3
Income tax (benefit) expense computed at effective worldwide tax rates $ (132) $ 15