Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Nonrecurring Fair Value Inputs (Details)

v2.4.0.6
Fair Value Measurements - Nonrecurring Fair Value Inputs (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Mar. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Mar. 31, 2013
Discounted Cash Flow Market Comparables [Member]
Loans and Securities [Member]
Instruments Backed by Residential Real Estate Assets [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Dec. 31, 2012
Discounted Cash Flow Market Comparables [Member]
Loans and Securities [Member]
Instruments Backed by Residential Real Estate Assets [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Mar. 31, 2013
Discounted Cash Flow Market Comparables [Member]
Loans and Securities [Member]
Minimum [Member]
Instruments Backed by Residential Real Estate Assets [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Dec. 31, 2012
Discounted Cash Flow Market Comparables [Member]
Loans and Securities [Member]
Minimum [Member]
Instruments Backed by Residential Real Estate Assets [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Mar. 31, 2013
Discounted Cash Flow Market Comparables [Member]
Loans and Securities [Member]
Maximum [Member]
Instruments Backed by Residential Real Estate Assets [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Dec. 31, 2012
Discounted Cash Flow Market Comparables [Member]
Loans and Securities [Member]
Maximum [Member]
Instruments Backed by Residential Real Estate Assets [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Mar. 31, 2013
Discounted Cash Flow [Member]
Loans and Securities [Member]
Instruments Backed by Commercial Real Estate Assets [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Dec. 31, 2012
Discounted Cash Flow [Member]
Loans and Securities [Member]
Instruments Backed by Commercial Real Estate Assets [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Mar. 31, 2013
Discounted Cash Flow [Member]
Loans and Securities [Member]
Minimum [Member]
Instruments Backed by Commercial Real Estate Assets [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Dec. 31, 2012
Discounted Cash Flow [Member]
Loans and Securities [Member]
Minimum [Member]
Instruments Backed by Commercial Real Estate Assets [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Mar. 31, 2013
Discounted Cash Flow [Member]
Loans and Securities [Member]
Maximum [Member]
Instruments Backed by Commercial Real Estate Assets [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Dec. 31, 2012
Discounted Cash Flow [Member]
Loans and Securities [Member]
Maximum [Member]
Instruments Backed by Commercial Real Estate Assets [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]                                
Loans and Securities Fair Value Disclosure         $ 4,312 $ 9,932         $ 102 $ 388        
Fair Value Inputs Yield, Weighted Average         4.00% 3.00%         9.00% 6.00%        
Loans Held-for-sale, Fair Value Disclosure 13,887 11,659 795 857 693 748         102 388        
Fair Value Inputs, Prepayment Rate, Weighted Average         14.00% 15.00%                    
Loans and leases     $ 3,619 [1] $ 5,813 [1] $ 3,619 $ 9,184                    
Fair Value Inputs, Probability of Default, Weighted Average         7.00% 7.00%                    
Fair Value Inputs, Loss Severity, Weighted Average         44.00% 48.00%         81.00% 53.00%        
Fair Value Inputs, Discount Rate, Weighted Average         15.00% 15.00%                    
Fair Value Inputs, Yield             4.00% 3.00% 5.00% 5.00%     5.00% 4.00% 11.00% 13.00%
Fair Value Inputs, Prepayment Rate             3.00% 3.00% 26.00% 30.00%            
Fair Value Inputs, Probability of Default             0.00% 0.00% 51.00% 55.00%            
Fair Value Inputs, Loss Severity             5.00% 6.00% 63.00% 66.00%     31.00% 24.00% 93.00% 88.00%
Fair Value Inputs, Discount Rate             0.00% 0.00% 28.00% 28.00%            
Fair Value Inputs, Cost to Sell         8.00% 8.00%                    
[1] Losses represent charge-offs on real estate-secured loans