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Stock Repurchase Program (Details Numeric) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 3 Months Ended
Mar. 31, 2021
Mar. 05, 2021
Feb. 28, 2020
Dec. 10, 2020
May 21, 2018
Payments for Repurchase of Common Stock   $ 950 $ 850    
Repurchase of common stock, Shares, Acquired   1.9 2.4    
Treasury Stock Acquired, Average Cost Per Share   $ 478.14 $ 332.59    
Up Front Payments Treasury Stock Remaining Balance   $ 317      
Stock Repurchase Authority 2018          
Stock Repurchase Program, Authorized Amount         $ 8,000
Stock Repurchase Authority 2020          
Stock Repurchase Program, Authorized Amount       $ 15,000  
Subsequent Event | Stock Repurchase Authority 2018          
Payments for Repurchase of Common Stock $ 1,000        
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 100