Fair Value Measurements - Nonrecurring Fair Value Inputs (Details) (USD $)
In Millions, unless otherwise specified |
6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | |||||||||||||||||||||||||||||
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Jun. 30, 2013
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Dec. 31, 2012
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Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
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Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
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Jun. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
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Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
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Jun. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Nonrecurring [Member]
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Jun. 30, 2012
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Nonrecurring [Member]
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Dec. 31, 2012
Instruments Backed by Commercial Real Estate Assets [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
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Jun. 30, 2013
Private Equity Investments and Funds [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
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Dec. 31, 2012
Private Equity Investments and Funds [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
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Jun. 30, 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, Recurring [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, Recurring [Member]
|
Jun. 30, 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]
|
Jun. 30, 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, Recurring [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, Recurring [Member]
|
Jun. 30, 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]
|
Jun. 30, 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, Recurring [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, Recurring [Member]
|
Jun. 30, 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]
|
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, Recurring [Member]
|
Jun. 30, 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]
|
Jun. 30, 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, Recurring [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, Recurring [Member]
|
Jun. 30, 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]
|
Jun. 30, 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, Recurring [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, Recurring [Member]
|
Jun. 30, 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 | $ 3,271 | [1] | $ 4,478 | [2] | $ 5,068 | $ 9,932 | $ 1,910 | [2] | $ 81 | $ 388 | |||||||||||||||||||||||||||||||||||||||||
Fair Value Inputs Yield, Weighted Average | 6.00% | 6.00% | 4.00% | 3.00% | 9.00% | 6.00% | |||||||||||||||||||||||||||||||||||||||||||||
Loans Held-for-sale, Fair Value Disclosure | 10,878 | 11,659 | 10,878 | 11,659 | 2,153 | [3],[4] | 2,733 | [3],[4] | 660 | 1,139 | 1,979 | [1] | 2,733 | [2] | 579 | 748 | 81 | 388 | |||||||||||||||||||||||||||||||||
Fair Value Inputs, Prepayment Rate, Weighted Average | 10.00% | 10.00% | 12.00% | 15.00% | |||||||||||||||||||||||||||||||||||||||||||||||
Loans and leases | 9,461 | 9,002 | 1,901 | 2,287 | 4,489 | [5] | 6,902 | [5] | 858 | [1] | 1,286 | [2] | 4,489 | 9,184 | |||||||||||||||||||||||||||||||||||||
Fair Value Inputs, Probability of Default, Weighted Average | 7.00% | 6.00% | 7.00% | 7.00% | |||||||||||||||||||||||||||||||||||||||||||||||
Fair Value Inputs, Loss Severity, Weighted Average | 41.00% | 43.00% | 43.00% | 48.00% | 88.00% | 83.00% | 53.00% | ||||||||||||||||||||||||||||||||||||||||||||
Fair Value Inputs, Discount Rate, Weighted Average | 15.00% | 15.00% | |||||||||||||||||||||||||||||||||||||||||||||||||
Fair Value Inputs, Yield | 2.00% | 2.00% | 3.00% | 3.00% | 25.00% | 25.00% | 6.00% | 5.00% | 0.00% | 5.00% | 5.00% | 4.00% | 0.00% | 5.00% | 9.00% | 13.00% | |||||||||||||||||||||||||||||||||||
Fair Value Inputs, Prepayment Rate | 1.00% | 1.00% | 3.00% | 3.00% | 35.00% | 30.00% | 20.00% | 30.00% | |||||||||||||||||||||||||||||||||||||||||||
Fair Value Inputs, Probability of Default | 0.00% | 0.00% | 0.00% | 0.00% | 28.00% | 44.00% | 28.00% | 55.00% | |||||||||||||||||||||||||||||||||||||||||||
Fair Value Inputs, Loss Severity | 8.00% | 6.00% | 8.00% | 6.00% | 85.00% | 85.00% | 61.00% | 66.00% | 0.00% | 51.00% | 82.00% | 24.00% | 0.00% | 100.00% | 86.00% | 88.00% | |||||||||||||||||||||||||||||||||||
Fair Value Inputs, Discount Rate | 0.00% | 0.00% | 29.00% | 28.00% | |||||||||||||||||||||||||||||||||||||||||||||||
Fair Value Inputs, Cost to Sell | 8.00% | 8.00% | |||||||||||||||||||||||||||||||||||||||||||||||||
Other Assets, Fair Value Disclosure | $ 21,746 | $ 26,490 | $ 21,746 | $ 26,490 | $ 1,700 | $ 3,129 | $ 12 | $ 11 | $ 1,900 | $ 976 | $ 1,200 | $ 1,910 | [2] | ||||||||||||||||||||||||||||||||||||||
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