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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Income taxes          
Effective tax rate on income from continuing operations (as a percent) 18.10% (2.40%) 15.40% 18.00%  
Valuation allowance $ 15   $ 15   $ 15
Gross unrecognized tax benefits 124   124   110
Unrecognized tax benefits net of federal tax benefits that would affect the effective tax rate 92   92   80
Increase in interest and penalties 0 $ 0   $ 1  
Decrease in interest and penalties     1    
Payable related to accrued interest and penalties 9   9   $ 10
Minimum          
Income taxes          
Amount of decrease in unrecognized tax benefits reasonably possible within next 12 months 40   40    
Maximum          
Income taxes          
Amount of decrease in unrecognized tax benefits reasonably possible within next 12 months 50   50    
State          
Income taxes          
Deferred tax assets, loss carryforwards 16   16    
Valuation allowance, net operating losses 12   12    
Valuation allowance 2   2    
Foreign          
Income taxes          
Valuation allowance $ 1   $ 1