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Capital Stock (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended 15 Months Ended 18 Months Ended
Sep. 30, 2016
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2015
Sep. 30, 2014
Oct. 31, 2016
Jul. 31, 2015
Jul. 31, 2014
Aug. 31, 2013
Apr. 30, 2013
Class of Stock [Line Items]                        
Common stock, shares authorized (in shares)   12,000,000,000                    
Increase in quarterly dividend rate 8.00%                      
Cash dividends declared (USD per share) $ 0.61 $ 2.35 $ 0.565 $ 2.17 $ 2.00              
Annualized dividend rate (USD per share)   $ 2.44                    
Repurchase of common stock (in shares)   16,221,001   10,682,419 22,452,599              
Average price of repurchased shares (USD per share)   $ 63.48   $ 51.83 $ 41.79              
Aggregate cost of shares repurchased   $ 1,030,000,000   $ 554,000,000 $ 939,000,000              
April 2013 Share Repurchase Program [Member]                        
Class of Stock [Line Items]                        
Stock repurchase program, authorized amount                     $ 1,000,000,000 $ 300,000,000
Repurchase of common stock (in shares)             27,100,000          
Average price of repurchased shares (USD per share)             $ 36.97          
July 2014 Share Repurchase Program [Member]                        
Class of Stock [Line Items]                        
Stock repurchase program, authorized amount                   $ 1,000,000,000    
Repurchase of common stock (in shares)           20,400,000            
Average price of repurchased shares (USD per share)           $ 48.90            
July 2015 Share Repurchase Program [Member]                        
Class of Stock [Line Items]                        
Stock repurchase program, authorized amount               $ 3,000,000,000 $ 1,000,000,000      
Repurchase of common stock (in shares)   16,200,000   600,000                
Average price of repurchased shares (USD per share)   $ 63.48   $ 57.66                
Aggregate cost of shares repurchased   $ 1,030,000,000   $ 35,000,000                
Amount remaining in the share repurchased program   $ 1,935,000,000                    
Serial Preferred Stock [Member]                        
Class of Stock [Line Items]                        
Preferred stock, shares authorized (in shares)   10,000,000                    
Preferred stock, par value (USD per share)   $ 1.00                    
Preferred stock, shares issued (in shares)   0                    
Stock Compensation Plan [Member]                        
Class of Stock [Line Items]                        
Shares of common stock reserved for stock-based awards (in shares)   41,952,545