Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Details)

v3.20.2
Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Operating Loss Carryforwards [Line Items]            
Income tax expense $ (72) $ (70) $ (226) $ (227)    
Effective income tax rate percent 20.90% 22.20% 21.90% 25.30%    
Valuation allowance $ 69   $ 69     $ 70
Forecast            
Operating Loss Carryforwards [Line Items]            
Effective income tax rate percent         23.00%