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Stockholders' Equity Preferred and Common Stock (Details) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 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 1,600   1,600   1,500
Common Stock, Shares Outstanding 1,600   1,600   1,500
Common Stock Purchased, Shares     10 55  
Common Stock Purchased, Amount     $ 300 $ 2,000  
Dividends Declared on Common Stock $ 591 $ 570 $ 1,200 $ 1,100