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Income Taxes - Provision for Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Current income taxes $ 235 $ 203 $ 353
Deferred income taxes (285) (474) 64
Total income tax provision (benefit) $ (50) $ (271) $ 417