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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 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Mar. 31, 2013
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Dec. 31, 2012
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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]
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| 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% | ||||||||||||||||||
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