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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Income taxes          
Effective tax rate on income from continuing operations (as a percent) 21.10% 21.10% 19.90% 19.50%  
Valuation allowance, deferred tax assets $ 66   $ 66   $ 65
Gross unrecognized tax benefits 154   154   150
Unrecognized tax benefits, net of federal tax benefits, that would affect the effective tax rate if recognized 125   125   120
Additions to unrecognized tax benefits for tax positions of prior years   $ 71      
Reductions to unrecognized tax benefits for tax positions of prior years   80      
Amount of decrease in unrecognized tax benefits reasonably possible within next 12 months 8   8    
Increase (decrease) in interest and penalties 1 $ 7 3 $ 8  
Payable related to accrued interest and penalties 29   29   26
Estimated CAMT 43   43   $ 0
State net operating losses          
Income taxes          
Valuation allowance, deferred tax assets 31   31    
State deferred tax assets          
Income taxes          
Valuation allowance, deferred tax assets 2   2    
Foreign net operating losses          
Income taxes          
Valuation allowance, deferred tax assets 33   33    
State          
Income taxes          
Deferred tax assets, loss carryforwards 32   32    
Foreign          
Income taxes          
Deferred tax assets, loss carryforwards $ 43   $ 43