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Stock-Based Compensation - Stock Options (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stock Option Program      
Balance at the beginning of the period 34,569 34,965  
Balance at the end of the period   34,569 34,965
Weighted average exercise price - Beginning balance $ 138.98 $ 125.73  
Weighted average exercise price - Ending balance   138.98 $ 125.73
Share- based compensation assumptions      
Weighted average exercise price $ 201.12 $ 233.63 $ 175.76
Risk-free interest rate (as a percent) 2.60% 2.70% 2.10%
Dividend yield (as a percent) 2.50% 2.40% 2.50%
Expected volatility (as a percent) 20.40% 21.00% 17.30%
Expected life 79 months 78 months 78 months
Black-Scholes fair value $ 34.19 $ 41.59 $ 23.51
Stock Options      
Stock Option Program      
Balance at the beginning of the period 34,569 34,965 36,196
Granted - Annual 3,434 3,211 5,410
Exercised (4,193) (3,482) (6,474)
Forfeited (135) (125) (167)
Balance at the end of the period 33,675 34,569 34,965
Options exercisable 26,487 26,117 24,281
Options exercisable, exercise price $ 136.75 $ 121.98 $ 108.50
Weighted average exercise price - Beginning balance 138.98 125.73 112.07
Weighted average exercise price - Granted - Annual 200.80 233.19 175.93
Weighted average exercise price - Exercised 89.89 91.01 90.37
Weighted average exercise price - Forfeited 201.27 188.00 162.36
Weighted average exercise price - Ending balance $ 151.15 $ 138.98 $ 125.73
Weighted average remaining contractual life for options outstanding 64 months    
Weighted average remaining contractual life for options exercisable 54 months    
Aggregate intrinsic value for options outstanding $ 1,100    
Aggregate intrinsic value for options exercisable $ 1,100    
Expiration of annual grants 10 years    
Compensation expense yet to be recognized $ 62    
Expense recognition period 20 months    
Total intrinsic value of stock options exercised $ 433 $ 469 $ 703
Cash received from options exercised 375 316 585
Tax benefit realized from exercise of stock options $ 91 $ 99 $ 238
Stock Options | Maximum      
Stock Option Program      
Vesting period 3 years    
Stock Options | Minimum      
Stock Option Program      
Vesting period 1 year