Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Nonrecurring Fair Value Inputs (Details)

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Fair Value Measurements - Nonrecurring Fair Value Inputs (Details) (Nonrecurring, Level 3, USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Market Comparables | Minimum
   
Fair Value Inputs [Abstract]    
Discount Rate 0.00% 0.00%
Cost to sell 8.00% 8.00%
Market Comparables | Maximum
   
Fair Value Inputs [Abstract]    
Discount Rate 28.00% 19.00%
Cost to sell 8.00% 8.00%
Instruments backed by residential real estate assets
   
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, fair value $ 4,298 $ 5,240
Instruments backed by residential real estate assets | Market Comparables | Weighted Average
   
Fair Value Inputs [Abstract]    
Discount Rate 8.00% 8.00%
Instruments backed by residential real estate assets | Loans and leases
   
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, fair value $ 4,298 $ 5,240