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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Nondesignated [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net Gain (Loss) Recognized in Income | $ (137) | $ 724 | $ (180) | $ 1,059
Fair Value Hedging [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (Loss) Recognized in Income on Derivative |  | 10 | 0 | 37
Gain (Loss) Recognized in Income on Hedged Item |  | (10) | 0 | (37)
Net Gain (Loss) Recognized in Income |  | (1) | 0 | (2)
Unrealized Gains Losses On Insured Derivatives [Member] | Credit Default Swap [Member] | Nondesignated [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net Gain (Loss) Recognized in Income | 1,318 | 1,202 | 1,216 | 1,502
Unrealized Gains Losses On Insured Derivatives [Member] | All Other [Member] | Nondesignated [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net Gain (Loss) Recognized in Income | 32 | 1 | 61 | 3
Unrealized Gains Losses On Insured Derivatives [Member] | Insured Swaps [Member] | Nondesignated [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net Gain (Loss) Recognized in Income | 0 |  | 0 | 1
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 | (1,532) | (428) | (1,520) | (432)
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 | 38 | (60) | 41 | (50)
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 |  | 10 | 0 | 37
Gain (Loss) Recognized in Income on Hedged Item |  | (10) | 0 | (37)
Net Gain (Loss) Recognized in Income |  | 0 | 0 | 0
Foreign Exchange And Other Derivative Financial Instruments [Member] | Currency Swap [Member] | Nondesignated [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net Gain (Loss) Recognized in Income | 0 | 2 | 2 | 0
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 | 0 | 10 | 14 | 31
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 | 7 | (2) | 6 | (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 | (1) | 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 | 0
Gain (Loss) Recognized in Income on Hedged Item |  | 0 | 0 | 0
Net Gain (Loss) Recognized in Income |  | $ (1) | $ 0 | $ (2)

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- Definition The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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 4: 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 Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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