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Stock Compensation Plans - Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
ESPP    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Discount stock purchase price percentage 15.00%  
Look-back feature period of discount stock purchase price 3 months  
Minimum contribution by participant percentage 1.00%  
Maximum contribution by participant percentage 10.00%  
Stocks purchased by employees during the period (in shares) 0.3 0.2
Discounted price per share of stocks purchased by employees (in dollar per share) $ 34.16 $ 30,820,000
Share-based Payment Arrangement, Tranche One [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 100.00%  
Restricted Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate period of U.S. Treasury yield 3 years  
Restricted Stock Units | Restricted stock units granted February 23, 2021    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 57.67  
Restricted Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation cost related to unvested awards $ 228  
Weighted average period to recognized compensation cost related to unvested awards 1 year 2 months 12 days  
Stock Option    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation cost related to unvested awards $ 15  
Weighted average period to recognized compensation cost related to unvested awards 6 months