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Income Taxes - Tax Effected Operating Loss, Capital Loss, and Tax Credit Carryovers (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Income tax          
Net UTB impacting the effective tax rate $ 1,140   $ 1,140   $ 1,178
Deferred tax assets valuation allowance $ 150   $ 150   $ 158
Effective tax rate (as a percent) 21.00% 21.80% 19.20% 20.10%  
Increase (decrease) in effective income tax rate from prior reporting period to current reporting period (as a percent) (0.80%)   (0.90%)    
Decrease in unrecognized tax benefits due to resolution of a lawsuit     $ 52