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Derivatives Derivatives - Additional Information (Details) (USD $)
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3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | |||||||||||||||||||
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Mar. 31, 2013
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Dec. 31, 2012
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Jun. 30, 2013
Monoline
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Jun. 30, 2013
Monoline
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Dec. 31, 2012
Monoline
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Jun. 30, 2013
Unilateral Derivative Termination Contract [Member]
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Jun. 30, 2013
Rating Agency Downgrade By One Notch
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Jun. 30, 2013
Rating Agency Downgrade By One Notch
Unilateral Derivative Termination Contract For Rating Downgrade of Long-Term Senior Debt [Member]
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Jun. 30, 2013
Rating Agency Downgrade by Two Notches
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Jun. 30, 2013
Rating Agency Downgrade by Two Notches
Unilateral Derivative Termination Contract For Rating Downgrade of Long-Term Senior Debt [Member]
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Dec. 31, 2012
Interest and Other Receivables
MBIA, Inc.
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Mar. 31, 2013
Other Revenues [Member]
MBIA, Inc.
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| Derivative [Line Items] | ||||||||||||||||||||||||
| Cash collateral received | $ (26,143,000,000) | $ (26,143,000,000) | $ (27,993,000,000) | |||||||||||||||||||||
| Cash collateral paid | 26,189,000,000 | 26,189,000,000 | 32,140,000,000 | |||||||||||||||||||||
| Credit Valuation Gains Losses Net Of Hedges Recognized In Trading Account Profits For Counterparty Credit Risk | 91,000,000 | [1] | (52,000,000) | [1] | (11,000,000) | [1] | 173,000,000 | [1] | ||||||||||||||||
| Derivative Credit Risk Valuation Adjustment, Derivative Assets | 1,200,000,000 | 1,200,000,000 | 1,100,000,000 | |||||||||||||||||||||
| Credit Valuation Gains (Losses) Net of Hedges Recognized In Trading Account Profit (Loss) | 80,000,000 | [2] | (73,000,000) | [2] | 209,000,000 | [2] | (770,000,000) | [2] | 18,000,000 | 57,000,000 | ||||||||||||||
| Derivative Credit Risk Valuation Adjustment, Derivative Liabilities | 600,000,000 | 600,000,000 | 400,000,000 | |||||||||||||||||||||
| Notional value of Monoline derivative credit exposure | 11,200,000,000 | 11,200,000,000 | 12,100,000,000 | |||||||||||||||||||||
| Fair value of monoline derivative credit exposure | 400,000,000 | 400,000,000 | 900,000,000 | |||||||||||||||||||||
| Credit risk valuation adjustment related to monoline derivative trading instruments exposure | 332,000,000 | 332,000,000 | 44,000,000 | 44,000,000 | 117,000,000 | |||||||||||||||||||
| Increase (Decrease) in Interest and Other Receivables | 450,000,000 | |||||||||||||||||||||||
| Derivative liability performance guaranteed by Bank of America | 1,300,000,000 | 1,300,000,000 | ||||||||||||||||||||||
| Receivable from Counterparty | 1,300,000,000 | |||||||||||||||||||||||
| Cash and securities collateral held | 37,000,000,000 | 37,000,000,000 | 38,200,000,000 | |||||||||||||||||||||
| Posted collateral | 31,200,000,000 | 31,200,000,000 | 38,300,000,000 | 200,000,000 | 700,000,000 | 600,000,000 | ||||||||||||||||||
| Collateral not yet posted to counterparties | 800,000,000 | 800,000,000 | ||||||||||||||||||||||
| Derivative liability, amount offset against collateral | 200,000,000 | 1,200,000,000 | ||||||||||||||||||||||
| Contractually required additional collateral | 400,000,000 | 4,100,000,000 | ||||||||||||||||||||||
| Derivative liability, incremental increase, amount offset against collateral | 1,000,000,000 | |||||||||||||||||||||||
| Notional Value of Credit Default Swaps | 7,400,000,000 | |||||||||||||||||||||||
| Market Value of Credit Default Swaps | $ 813,000,000 | |||||||||||||||||||||||
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