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Income Taxes - Summary of Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Tax Disclosure [Abstract]        
Earnings (loss) before income taxes $ (609) $ 212 $ (500) $ 410
Income tax expense computed at United States statutory tax rate (128) 74 (105) 143
Valuation allowances 39 6 39 7
Audits and settlements (3) (9) (3) (6)
U.S. foreign income items, net of credits (34) (34) (45) (53)
Non deductible impairments 138 0 138 0
Non deductible government payments 37 0 37 0
Other (19) (4) (16) (18)
Income tax expense computed at effective worldwide tax rates $ 30 $ 33 $ 45 $ 73