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Derivatives - Credit-related Contingent Features and Collateral (Details) (USD $)
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Mar. 31, 2013
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Dec. 31, 2012
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| Derivative [Line Items] | ||
| Collateral Held, Cash and Securities | $ 85,900,000,000 | $ 85,600,000,000 |
| Collateral Already Posted, Aggregate Fair Value | 68,700,000,000 | 74,100,000,000 |
| Collateral Not Yet Posted Aggregate Fair Value | 2,000,000,000 | |
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Unilateral Derivative Termination Contract [Member]
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| Derivative [Line Items] | ||
| Collateral Already Posted, Aggregate Fair Value | 1,200,000,000 | |
| Derivative Liability, Fair Value, Amount Offset Against Collateral | 1,300,000,000 | |
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Unilateral Derivative Termination Contract For Rating Downgrade of Long-Term Senior Debt [Member]
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| Derivative [Line Items] | ||
| Collateral Already Posted, Aggregate Fair Value | 3,100,000,000 | |
| Derivative Liability, Fair Value, Amount Offset Against Collateral | 3,900,000,000 | |
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Rating Agency Downgrade By One Notch [Member]
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| Derivative [Line Items] | ||
| Additional Collateral, Aggregate Fair Value | 2,700,000,000 | |
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Rating Agency Downgrade by Two Notches [Member]
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| Derivative [Line Items] | ||
| Additional Collateral, Aggregate Fair Value | 5,400,000,000 | |
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Rating Agency Downgrade by Two Notches [Member] | Unilateral Derivative Termination Contract For Rating Downgrade of Long-Term Senior Debt [Member]
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| Derivative [Line Items] | ||
| Collateral Already Posted, Aggregate Fair Value | 972,000,000 | |
| Derivative Liability, Incremental Increase, Fair Value, Amount Offset Against Collateral | 1,500,000,000 | |
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Bank of America, N.A. [Member]
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| Derivative [Line Items] | ||
| Collateral Not Yet Posted Aggregate Fair Value | 681,000,000 | |
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Bank of America, N.A. [Member] | Rating Agency Downgrade By One Notch [Member]
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| Derivative [Line Items] | ||
| Additional Collateral, Aggregate Fair Value | 2,300,000,000 | |
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Bank of America, N.A. [Member] | Rating Agency Downgrade by Two Notches [Member]
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| Derivative [Line Items] | ||
| Additional Collateral, Aggregate Fair Value | 1,400,000,000 | |
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Merrill Lynch [Member]
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| Derivative [Line Items] | ||
| Collateral Not Yet Posted Aggregate Fair Value | 1,300,000,000 | |
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Merrill Lynch [Member] | Rating Agency Downgrade By One Notch [Member]
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| Derivative [Line Items] | ||
| Additional Collateral, Aggregate Fair Value | 407,000,000 | |
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Merrill Lynch [Member] | Rating Agency Downgrade by Two Notches [Member]
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| Derivative [Line Items] | ||
| Additional Collateral, Aggregate Fair Value | $ 4,000,000,000 |