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Fair Value Disclosures - Quantitative Information About Level 3 Fair Value Measurements (Details) (Level 3, Fair Value, Measurements, Recurring, USD $)
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12 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2012
Private equity investments and funds
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Dec. 31, 2012
Borrowings
Industry Standard Derivative Pricing
Long-term borrowings (structured notes)
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Dec. 31, 2012
Borrowings
Maximum
Industry Standard Derivative Pricing
Long-term borrowings (structured notes)
|
Dec. 31, 2012
Borrowings
Minimum
Industry Standard Derivative Pricing
Long-term borrowings (structured notes)
|
Dec. 31, 2012
Loans and Securities
Discounted Cash Flow
Instruments backed by residential real estate assets
|
Dec. 31, 2012
Loans and Securities
Discounted Cash Flow
Instruments backed by commercial real estate assets
|
Dec. 31, 2012
Loans and Securities
Discounted Cash Flow Market Comparables
Commercial loans, debt securities and other
|
Dec. 31, 2012
Loans and Securities
Discounted Cash Flow Market Comparables
Auction rate securities
|
Dec. 31, 2012
Loans and Securities
Weighted Average
Discounted Cash Flow
Instruments backed by residential real estate assets
|
Dec. 31, 2012
Loans and Securities
Weighted Average
Discounted Cash Flow
Instruments backed by commercial real estate assets
|
Dec. 31, 2012
Loans and Securities
Weighted Average
Discounted Cash Flow Market Comparables
Commercial loans, debt securities and other
|
Dec. 31, 2012
Loans and Securities
Weighted Average
Discounted Cash Flow Market Comparables
Auction rate securities
|
Dec. 31, 2012
Loans and Securities
Maximum
Discounted Cash Flow
Instruments backed by residential real estate assets
|
Dec. 31, 2012
Loans and Securities
Maximum
Discounted Cash Flow
Instruments backed by commercial real estate assets
|
Dec. 31, 2012
Loans and Securities
Maximum
Discounted Cash Flow Market Comparables
Commercial loans, debt securities and other
|
Dec. 31, 2012
Loans and Securities
Maximum
Discounted Cash Flow Market Comparables
Auction rate securities
|
Dec. 31, 2012
Loans and Securities
Minimum
Discounted Cash Flow
Instruments backed by residential real estate assets
|
Dec. 31, 2012
Loans and Securities
Minimum
Discounted Cash Flow
Instruments backed by commercial real estate assets
|
Dec. 31, 2012
Loans and Securities
Minimum
Discounted Cash Flow Market Comparables
Commercial loans, debt securities and other
|
Dec. 31, 2012
Loans and Securities
Minimum
Discounted Cash Flow Market Comparables
Auction rate securities
|
Dec. 31, 2012
Net Derivative Contracts
|
Dec. 31, 2012
Net Derivative Contracts
Discounted Cash Flow
Commodity contracts
|
Dec. 31, 2012
Net Derivative Contracts
Industry Standard Derivative Pricing
Equity derivatives
|
Dec. 31, 2012
Net Derivative Contracts
Industry Standard Derivative Pricing
Interest rate derivatives
|
Dec. 31, 2012
Net Derivative Contracts
Discounted Cash Flow Hazard Rate Model Stochastic Recovery Correlation Model
Credit derivatives
|
Dec. 31, 2012
Net Derivative Contracts
Maximum
Discounted Cash Flow
Commodity contracts
|
Dec. 31, 2012
Net Derivative Contracts
Maximum
Industry Standard Derivative Pricing
Equity derivatives
|
Dec. 31, 2012
Net Derivative Contracts
Maximum
Industry Standard Derivative Pricing
Interest rate derivatives
|
Dec. 31, 2012
Net Derivative Contracts
Maximum
Discounted Cash Flow Hazard Rate Model Stochastic Recovery Correlation Model
Credit derivatives
|
Dec. 31, 2012
Net Derivative Contracts
Minimum
Discounted Cash Flow
Commodity contracts
|
Dec. 31, 2012
Net Derivative Contracts
Minimum
Industry Standard Derivative Pricing
Equity derivatives
|
Dec. 31, 2012
Net Derivative Contracts
Minimum
Industry Standard Derivative Pricing
Interest rate derivatives
|
Dec. 31, 2012
Net Derivative Contracts
Minimum
Discounted Cash Flow Hazard Rate Model Stochastic Recovery Correlation Model
Credit derivatives
|
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| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||
| Derivative Asset, Fair Value, Net | $ 1,544,000,000 | $ (5,000,000) | $ (814,000,000) | $ 731,000,000 | $ 1,632,000,000 | ||||||||||||||||||||||||||||||||||||||||||
| Loans and Securities | 1,608,000,000 | 6,787,000,000 | |||||||||||||||||||||||||||||||||||||||||||||
| Loans, notes and mortgages | 1,681,000,000 | 1,726,000,000 | 1,231,000,000 | 450,000,000 | |||||||||||||||||||||||||||||||||||||||||||
| Trading assets - Mortgages, mortgage-backed and asset-backed | 377,000,000 | 4,437,000,000 | |||||||||||||||||||||||||||||||||||||||||||||
| Other assets | 1,534,000,000 | 1,349,000,000 | 287,000,000 | 1,534,000,000 | |||||||||||||||||||||||||||||||||||||||||||
| Trading assets - Corporate debt | 1,900,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||
| Trading assets - Municipals and money markets | 1,295,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||
| Long-term borrowings | 1,316,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||
| Fair Value Inputs [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||
| Yield | 7.00% | 5.00% | 5.00% | 25.00% | 5.00% | 25.00% | 4.00% | 5.00% | 0.00% | 25.00% | 2.00% | ||||||||||||||||||||||||||||||||||||
| Prepayment Speed | 7.00% | 20.00% | 10.00% | 30.00% | 3.00% | 5.00% | 30.00% | 3.00% | |||||||||||||||||||||||||||||||||||||||
| Default Rates | 2.00% | 4.00% | 3.00% | 5.00% | 1.00% | 1.00% | 5.00% | 1.00% | |||||||||||||||||||||||||||||||||||||||
| Loss Severities | 41.00% | 88.00% | 35.00% | 45.00% | 100.00% | 40.00% | 35.00% | 51.00% | 25.00% | 40.00% | 25.00% | ||||||||||||||||||||||||||||||||||||
| Enterprise Value/EBITDA multiple | 6 | 11 | 2 | ||||||||||||||||||||||||||||||||||||||||||||
| Projected tender price / re-financing level | 90.00% | 100.00% | 50.00% | ||||||||||||||||||||||||||||||||||||||||||||
| Equity Correlation | 0.97 | [1],[2] | 0.30 | [1],[2] | 0.97 | [3] | 0.30 | [3] | |||||||||||||||||||||||||||||||||||||||
| Long- Dated Volatilities | 70.00% | [1],[2] | 20.00% | [1],[2] | 70.00% | [3] | 20.00% | [3] | |||||||||||||||||||||||||||||||||||||||
| Credit spreads | 615 | 58 | |||||||||||||||||||||||||||||||||||||||||||||
| Upfront points | 99 | 25 | |||||||||||||||||||||||||||||||||||||||||||||
| Spread to index | 1,972 | (2,080) | |||||||||||||||||||||||||||||||||||||||||||||
| Credit correlation | 75.00% | 19.00% | |||||||||||||||||||||||||||||||||||||||||||||
| Long-term Natural Gas Basis | $ 0.30 | $ (0.30) | |||||||||||||||||||||||||||||||||||||||||||||
| Correlation (IR/IR) | 99.00% | [3] | 15.00% | [3] | |||||||||||||||||||||||||||||||||||||||||||
| Correlation (FX/IR) | 50.00% | [3] | (65.00%) | [3] | |||||||||||||||||||||||||||||||||||||||||||
| Long-Dated Inflation Rates | 3.00% | [3] | 2.00% | [3] | |||||||||||||||||||||||||||||||||||||||||||
| Long-Dated Inflation Volatilities | 1.00% | [3] | 0.00% | [3] | |||||||||||||||||||||||||||||||||||||||||||
| Long-Dated Volatilities (FX) | 36.00% | [3] | 5.00% | [3] | |||||||||||||||||||||||||||||||||||||||||||
| Long-Dated Swap Rates | 10.00% | [3] | 8.00% | [3] | |||||||||||||||||||||||||||||||||||||||||||
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