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Income Taxes - Summary of Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Income Tax Disclosure [Abstract]        
Earnings before income taxes $ 43 $ 202 $ 261 $ 544
Income tax expense computed at United States statutory tax rate 9 42 55 114
Valuation allowances 5 39 6 (196)
Audits and settlements 5 (13) 17 (13)
U.S. foreign income items, net of credits (2) 4 1 11
Changes in enacted tax rates 0 25 0 25
Other 1 33 10 57
Income tax expense (benefit) computed at effective worldwide tax rates $ 18 $ 130 $ 89 $ (2)