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Stock Repurchase Program (Details Numeric) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 04, 2021
May 29, 2020
Dec. 10, 2020
May 21, 2018
Payments for Repurchase of Common Stock   $ 1,950 $ 1,700    
Repurchase of common stock, Shares, Acquired   3.9 5.0    
Treasury Stock Acquired, Average Cost Per Share   $ 478.58 $ 332.31    
Up Front Payments Treasury Stock Remaining Balance   $ 333      
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 $ 14,100