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Income Taxes - Net Deferred Tax Assets Reflected in Consolidated Balance Sheets (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
Deferred tax assets $ 1,451 $ 1,134
Deferred tax liabilities (112) (172)
Net deferred tax assets $ 1,339 $ 962