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Derivative Instruments (Effect Of Derivative Instruments On Consolidated Statements Of Operations) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Nondesignated [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net gain/(loss) recognized in income | $ 275 | $ (40) | $ 96 | $ 1,019
Fair Value Hedging [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain/(loss) recognized in income on derivative |  | (12) |  | 25
Gain/(loss) recognized in income on hedged item |  | 12 |  | (25)
Net gain/(loss) recognized in income |  | 0 |  | (3)
Unrealized Gains Losses On Insured Derivatives [Member] | Credit Default Swap [Member] | Nondesignated [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net gain/(loss) recognized in income | 287 | (40) | 1,502 | 1,463
Unrealized Gains Losses On Insured Derivatives [Member] | All Other [Member] | Nondesignated [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net gain/(loss) recognized in income | (2) | 7 | 60 | 10
Unrealized Gains Losses On Insured Derivatives [Member] | Insured Swaps [Member] | Nondesignated [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net gain/(loss) recognized in income | 0 |  | 0 | 0
Realized Gains Losses And Other Settlements On Insured Derivatives [Member] | Credit Default Swap [Member] | Nondesignated [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net gain/(loss) recognized in income | (28) | 12 | (1,548) | (420)
Foreign Exchange And Other Derivative Financial Instruments [Member] | Non Insured Credit Default Swaps [Member] | Nondesignated [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net gain/(loss) recognized in income | 0 | 0 | 0 | (1)
Foreign Exchange And Other Derivative Financial Instruments [Member] | Interest Rate Swap [Member] | Nondesignated [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net gain/(loss) recognized in income | 17 | (26) | 58 | (76)
Foreign Exchange And Other Derivative Financial Instruments [Member] | Interest Rate Swap [Member] | Fair Value Hedging [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain/(loss) recognized in income on derivative |  | (12) |  | 25
Gain/(loss) recognized in income on hedged item |  | 12 |  | (25)
Net gain/(loss) recognized in income |  | 0 |  | 0
Foreign Exchange And Other Derivative Financial Instruments [Member] | Currency Swap [Member] | Nondesignated [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net gain/(loss) recognized in income | (1) | 1 | 1 | 1
Foreign Exchange And Other Derivative Financial Instruments [Member] | Currency Swap [Member] | Fair Value Hedging [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain/(loss) recognized in income on derivative |  |  |  | 0
Gain/(loss) recognized in income on hedged item |  |  |  | 0
Net gain/(loss) recognized in income |  |  |  | 0
Foreign Exchange And Other Derivative Financial Instruments [Member] | All Other [Member] | Nondesignated [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net gain/(loss) recognized in income | 0 | 0 | 0 | 11
Foreign Exchange And Other Derivative Financial Instruments Attributable To V I E [Member] | Non Insured Credit Default Swaps V I E [Member] | Nondesignated [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net gain/(loss) recognized in income | 0 | 0 | 0 | (1)
Foreign Exchange And Other Derivative Financial Instruments Attributable To V I E [Member] | Interest Rate Swaps V I E [Member] | Nondesignated [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net gain/(loss) recognized in income | 2 | 8 | 17 | 39
Foreign Exchange And Other Derivative Financial Instruments Attributable To V I E [Member] | Currency Swaps Vie [Member] | Nondesignated [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net gain/(loss) recognized in income | 0 | (2) | 6 | (5)
Foreign Exchange And Other Derivative Financial Instruments Attributable To V I E [Member] | All Other V I E [Member] | Nondesignated [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net gain/(loss) recognized in income | 0 | 0 | 0 | (2)
Interest Income Expense [Member] | Interest Rate Swap [Member] | Fair Value Hedging [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain/(loss) recognized in income on derivative |  | 0 |  | 0
Gain/(loss) recognized in income on hedged item |  | 0 |  | 0
Net gain/(loss) recognized in income |  | $ 0 |  | $ (3)

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- Definition Gain Loss On Derivatives Recognized In Income + References No definition available. + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Definition Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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