Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Narrative (Details)

v3.19.3
Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Investments, Owned, Federal Income Tax Note [Line Items]            
Income tax expense $ 70 $ 12 $ 227 $ 162    
Effective income tax rate percent 22.20% 3.30% 25.30% 14.90%    
Valuation allowance $ 86   $ 86     $ 66
Forecast            
Investments, Owned, Federal Income Tax Note [Line Items]            
Effective income tax rate percent         24.00%