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Stockholders' Equity Preferred and Common Stock (Details) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Stockholders' Equity Note [Abstract]          
Preferred Stock, Shares Authorized 2,000   2,000    
Common Stock, Shares Authorized 5,000   5,000    
Common Stock, Shares Issued 1,500   1,500   1,500
Common Stock, Shares Outstanding 1,500   1,500   1,500
Common Stock Purchased, Shares     48 85  
Common Stock Purchased, Amount     $ 1,500 $ 2,900  
Dividends Paid on Common Stock $ 585 $ 563 $ 1,763 $ 1,618