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Income Taxes - Summary of Tax Provisions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Tax Disclosure [Abstract]        
Pre-tax income at estimated annual effective income tax rate before discrete items $ (69) $ 52 $ 22 $ 106
Impact of change in estimated annual effective tax rate on previous quarter’s pre-tax income 24 1 0 0
Interim period treatment of operational losses in foreign jurisdictions for which no tax benefit is recognized 7 0 9 1
Other discrete items (36) 21 (35) 23
Provision for income taxes $ (74) $ 74 $ (4) $ 130