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Derivative Instruments (Effect Of Derivative Instruments On Consolidated Statements Of Operations) (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Nondesignated [Member] |  |  |
Derivative [Line Items] |  |  |
Net gain/(loss) recognized in income | $ 325 | $ 1,445 | $ (2,960)
Fair Value Hedging [Member] |  |  |
Derivative [Line Items] |  |  |
Gain/(loss) recognized in income on derivative |  | 12 | (6)
Gain/(loss) recognized in income on hedged item |  | (12) | 6
Net gain/(loss) recognized in income |  | (3) | (9)
Unrealized Gains Losses On Insured Derivatives [Member] | Credit Default Swap [Member] | Nondesignated [Member] |  |  |
Derivative [Line Items] |  |  |
Net gain/(loss) recognized in income | 1,725 | 1,847 | (389)
Unrealized Gains Losses On Insured Derivatives [Member] | All Other [Member] | Nondesignated [Member] |  |  |
Derivative [Line Items] |  |  |
Net gain/(loss) recognized in income | 52 | 22 | (52)
Unrealized Gains Losses On Insured Derivatives [Member] | Insured Swaps [Member] | Nondesignated [Member] |  |  |
Derivative [Line Items] |  |  |
Net gain/(loss) recognized in income | 0 | 1 | 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 | (1,545) | (406) | (2,371)
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 | (1) | (2)
Foreign Exchange And Other Derivative Financial Instruments [Member] | Interest Rate Swap [Member] | Nondesignated [Member] |  |  |
Derivative [Line Items] |  |  |
Net gain/(loss) recognized in income | 65 | (75) | (193)
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 | (8)
Gain/(loss) recognized in income on hedged item |  | (12) | 8
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 | (2) | (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 | 2
Gain/(loss) recognized in income on hedged item |  | 0 | (2)
Net gain/(loss) recognized in income |  | 0 | 0
Foreign Exchange And Other Derivative Financial Instruments [Member] | All Other [Member] | Nondesignated [Member] |  |  |
Derivative [Line Items] |  |  |
Net gain/(loss) recognized in income | 0 | 11 | (6)
Foreign Exchange And Other Derivative Financial Instruments [Member] | Credit Linked Notes [Member] | Nondesignated [Member] |  |  |
Derivative [Line Items] |  |  |
Net gain/(loss) recognized in income |  |  | 0
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 | (1) | 12
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 | 17 | 55 | 53
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 | 10 | (4) | (3)
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 | (2) | (8)
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 |  | $ (3) | $ (9)

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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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