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Income Taxes Components of Net Deferred Tax Liability (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Components of Net Deferred Income Tax [Abstract]    
Total deferred income tax assets $ 1,081 $ 1,028
Deferred Tax Liabilities, Net (3,428) (3,208)
Valuation allowance 134 95
Net deferred income tax assets $ 947 $ 933