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Acquired Property Net Acquired Property Net (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Acquired Property [Roll Forward]          
Acquired Property, Beginning Balance $ 12,744 $ 10,719 $ 12,307 $ 11,158  
Acquired Property, Additions 3,425 4,195 7,197 7,969  
Acquired Property, Disposals (3,873) (4,108) (7,208) (8,321)  
Acquired Property, Ending Balance 12,296 10,806 12,296 10,806  
Real Estate Owned Valuation Allowance [Roll Forward]          
Valuation Allowance, Beginning Balance (784) (570) (686) (669)  
Valuation Allowance, Period (Increase) Decrease 48 30 (50) 129  
Valuation Allowance, Ending Balance (736) (540) (736) (540)  
Acquired property, net $ 11,560 $ 10,266 $ 11,560 $ 10,266 $ 11,621