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Stock-Based Compensation, Restricted Stock Units (Details) - Restricted Stock [Member] - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Weighted average grant date fair value (in dollars per share) $ 205.73 $ 169.23 $ 116.72
Length of service after grant date 1 year    
Retirement eligibility, employee age 60 years    
Service period, minimum 5 years    
Retirement eligibility, employee age with no service requirement 65 years    
Unrecognized compensation costs related to stock awards $ 46    
Unrecognized compensation costs related to equity awards after income taxes $ 36    
Weighted average remaining period for recognition of unrecognized costs related to equity awards 1 year 4 months 24 days    
Fair value of restricted stock unit awards vested $ 67 $ 53 $ 57
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Beginning Balance, Nonvested (in shares) 902,700    
Granted (in shares) 317,900    
Vested (in shares) (320,700)    
Forfeited (in shares) (86,200)    
Ending Balance, Nonvested (in shares) 813,700 902,700  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Beginning Balance, Nonvested (in dollars per share) $ 137.12    
Granted (in dollars per share) 205.73 $ 169.23 $ 116.72
Vested (in dollars per share) 137.00    
Forfeited (in dollars per share) 142.21    
Ending Balance, Nonvested (in dollars per share) $ 163.44 $ 137.12  
Directors [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year