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Stock Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jan. 04, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Number of shares remaining available for future issuance (in shares)   40,334,683    
Future compensation not yet recognized in the Statements of Income   $ 237    
Future compensation to be recognized in 2021   115    
Future compensation to be recognized in 2022   77    
Future compensation to be recognized in 2023   40    
Future compensation to be recognized in 2024   5    
Remaining stock repurchase authorizations   $ 10,630    
Employee stock purchase plan        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Percent of the underlying common stock's market price participants pay for options (in hundredths)   85.00%    
ESPP option term (in months)   three    
Number of shares remaining available for future issuance (in shares)   33,097,602    
Aggregate intrinsic values of options exercised   $ 14 $ 13 $ 13
Weighted-average exercise price, Exercised (in dollars per share)   $ 103.48    
Outstanding options exercisable (in shares)   0    
Weighted average grant date fair value of options granted (dollars per share)   $ 19.19 $ 18.05 $ 15.43
Employee stock purchase plan | Subsequent Event        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Weighted-average exercise price, Exercised (in dollars per share) $ 137.89      
Long-term incentive and director compensation plans | Employee Stock Option        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Term of the long term incentive stock options   10 years    
Award vesting period (in years)   4 years    
Aggregate intrinsic values of options exercised   $ 681 $ 819 $ 561
Future compensation not yet recognized in the Statements of Income   $ 103    
Weighted-average exercise price, Exercised (in dollars per share)   $ 53.28    
Outstanding options exercisable (in shares)   17,221,451    
Long-term incentive and director compensation plans | Restricted Stock Units (RSUs)        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Award vesting period (in years)   4 years    
Weighted-average grant-date fair value, Granted (in dollars per share)   $ 130.59 $ 106.58 $ 110.05
Total fair values of shares vested from RSU lapses   $ 110 $ 125 $ 123
Future compensation not yet recognized in the Statements of Income   $ 134