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Income Taxes - Summary of Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]        
Earnings (loss) before income taxes $ 223 $ 268 $ (277) $ 678
Income tax (benefit) expense computed at United States statutory tax rate 47 94 (58) 237
Valuation allowances (releases) 4 (84) 43 (77)
U.S. transition tax 78 0 78 0
U.S. foreign income items, net of credits (108) (17) (146) (70)
Changes in enacted rates (54) 0 (54) 0
Non deductible impairments 0 0 138 0
Non deductible government payments 0 0 37 0
Other 40 3 14 (21)
Income tax (benefit) expense computed at effective worldwide tax rates $ 7 $ (4) $ 52 $ 69