Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Narrative (Details)

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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Investments, Owned, Federal Income Tax Note [Line Items]        
Income tax expense $ 81 $ 80    
Effective income tax rate percent 33.30% 21.70%    
Valuation allowance $ 88     $ 66
Forecast        
Investments, Owned, Federal Income Tax Note [Line Items]        
Effective income tax rate percent     24.00%