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Income Taxes Components of Net Deferred Tax Liability (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Components of Net Deferred Income Tax [Abstract]    
Total deferred income tax assets $ 1,028 $ 996
Deferred Tax Liabilities, Net (3,208) (2,926)
Valuation allowance 95 96
Net deferred income tax assets $ 933 $ 900