Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Nonrecurring Fair Value Inputs (Details)

v2.4.0.8
Fair Value Measurements - Nonrecurring Fair Value Inputs (Details) (Nonrecurring [Member], Level 3 [Member], USD $)
In Millions, unless otherwise specified
6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Instruments Backed by Residential Real Estate Assets [Member]
Loans and Securities [Member]
Discounted cash flow, Market comparables [Member]
Dec. 31, 2013
Instruments Backed by Residential Real Estate Assets [Member]
Loans and Securities [Member]
Discounted cash flow, Market comparables [Member]
Jun. 30, 2014
Instruments Backed by Residential Real Estate Assets [Member]
Loans and Securities [Member]
Market Comparables [Member] [Domain]
Minimum [Member]
Dec. 31, 2013
Instruments Backed by Residential Real Estate Assets [Member]
Loans and Securities [Member]
Market Comparables [Member] [Domain]
Minimum [Member]
Jun. 30, 2014
Instruments Backed by Residential Real Estate Assets [Member]
Loans and Securities [Member]
Market Comparables [Member] [Domain]
Maximum [Member]
Dec. 31, 2013
Instruments Backed by Residential Real Estate Assets [Member]
Loans and Securities [Member]
Market Comparables [Member] [Domain]
Maximum [Member]
Jun. 30, 2014
Instruments Backed by Residential Real Estate Assets [Member]
Loans and Securities [Member]
Market Comparables [Member] [Domain]
Weighted average [Member]
Dec. 31, 2013
Instruments Backed by Residential Real Estate Assets [Member]
Loans and Securities [Member]
Market Comparables [Member] [Domain]
Weighted average [Member]
Fair Value Inputs Assets and Liabilities, Quantitative Information [Line Items]                    
Instruments backed by residential real estate assets     $ 3,244 $ 5,240            
Loans and leases $ 3,244 $ 4,489 $ 3,244 $ 5,240            
Fair Value Inputs [Abstract]                    
Discount Rate         0.00% 0.00% 28.00% 19.00% 10.00% 8.00%
Cost to sell         8.00% 8.00% 8.00% 8.00%