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Capital Stock (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Capital Stock [Line Items]      
Shares repurchased (in shares) 135,000 7,400,000 1,300,000
Repurchase and retirement of shares of common stock $ 13 $ 700 $ 100
Remaining shares authorized to be repurchased $ 1,870    
Capital shares reserved for future issuance 11,000,000 15,000,000  
Preferred stock, capital shares reserved for future issuance 500,000    
Preferred stock, par per share $ 1    
Aggregate intrinsic value of options exercised $ 128 $ 98 $ 113
Options exercised during period, exercise price range, lower range limit $ 38.71    
Options exercised during period, exercise price range, upper range limit $ 115.35    
Compensation cost not yet recognized $ 84    
Compensation cost not yet recognized, period for recognized 1 year 7 months    
Restricted Stock Units (RSUs)      
Capital Stock [Line Items]      
Compensation cost not yet recognized $ 53    
Compensation cost not yet recognized, period for recognized 1 year    
Weighted average grant date fair value, granted (in dollars per share) $ 94.70 $ 88.47  
Shares vested during the period $ 40    
Performance Stock Units (PSUs)      
Capital Stock [Line Items]      
Compensation cost not yet recognized $ 12    
Compensation cost not yet recognized, period for recognized 1 year    
Weighted average grant date fair value, granted (in dollars per share) $ 98.10    
Shares vested during the period $ 0    
Employee Stock Purchase Plans      
Capital Stock [Line Items]      
Percentage of closing stock price under ESPP 95.00%    
Shares issued under the ESPP 159,329 157,931