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Stockholders' Equity and Noncontrolling Interests Preferred and Common Stock (Details)
$ / shares in Units, shares in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
Class of Stock [Line Items]        
Preferred Stock, Shares Authorized   2,000    
Common Stock, Shares Authorized   5,000    
Common Stock, Shares, Issued   1,500 1,500  
Common Stock, Shares, Outstanding   1,500 1,500  
Dividends declared per common share | $ / shares   $ 1.52 $ 1.38 $ 1.20
Cash dividends paid on common stock | $   $ 2,337 $ 2,174 $ 1,928
Number of Votes per Share | $ / shares   1    
Common Shares Purchased During Period   77 102  
Common Stock Purchased, Amount | $   $ 2,500 $ 3,500  
Series A Preferred Stock [Member]        
Class of Stock [Line Items]        
Payments for Repurchase of Preferred Stock | $ $ 3,900      
Charges related to preferred shares redemption | $ $ 809