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Capital Stock (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Capital Stock [Line Items]      
Common and Preferred Stock, shares authorized (in shares) 1,000,500,000    
Preferred Stock, Shares Authorized 500,000    
Preferred stock, par per share $ 1    
Common stock, authorized (in shares) 1,000,000,000    
Common stock, par value (in dollars per share) $ 0.10 $ 0.10  
Preferred stock, outstanding (in shares) 0    
Remaining shares authorized to be repurchased $ 1,033    
Capital shares reserved for future issuance 28,000,000 31,000,000  
Aggregate intrinsic value of options exercised $ 258 $ 294 $ 247
Options exercised during period, exercise price range, lower range limit $ 53.60    
Options exercised during period, exercise price range, upper range limit $ 216.35    
Compensation cost not yet recognized $ 99    
Compensation cost not yet recognized, period for recognized 1 year 4 months 24 days    
Restricted Stock Units (RSUs)      
Capital Stock [Line Items]      
Compensation cost not yet recognized $ 68    
Compensation cost not yet recognized, period for recognized 1 year    
Weighted average grant date fair value, Granted (in dollars per share) $ 208.96 $ 175.96  
Shares vested during the period $ 55    
Performance Stock Units (PSUs)      
Capital Stock [Line Items]      
Compensation cost not yet recognized $ 16    
Compensation cost not yet recognized, period for recognized 1 year    
Weighted average grant date fair value, Granted (in dollars per share) $ 217.73    
Shares vested during the period $ 9    
Employee Stock Purchase Plans      
Capital Stock [Line Items]      
Percentage of closing stock price under ESPP 95.00%    
Shares issued under the ESPP 209,837 166,758