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Stock Repurchases (Details) - USD ($)
shares in Millions
2 Months Ended 3 Months Ended
Apr. 16, 2021
Feb. 04, 2021
Apr. 16, 2021
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 13, 2019
Stock Repurchased During Period, Shares 0.1 0.6 0.7        
Percentage Of Accelerated Share Repurchases Of Shares Expected To Be Repurchased   85.00%          
Stock repurchase program, authorized amount           $ 3,000,000,000 $ 500,000,000
Stock repurchase program, remaining authorized amount       $ 246,000,000      
Stock Repurchased During Period, Shares 0.1 0.6 0.7        
Stock Repurchased During Period, Value   $ 200,000,000.0          
Shares repurchased from employees who surrendered shares to satisfy minimum tax withholding obligations, value       $ 6,000,000.0 $ 5,500,000