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Income Taxes and Accounting for Uncertainty in Income Taxes - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Taxes and Accounting for Uncertainty in Income Taxes      
Unrecognized tax benefits if recognized, could favorably affect our effective tax rate $ 370    
Interest 22 $ 13 $ 13
Accrued interest and penalties $ 75 $ 53