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Derivative Instruments (Credit Derivatives Sold) (Detail) (Insurance Operations [Member], USD $) In Millions, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | $ 55,064 | $ 73,551
Total Fair Value of Credit Derivatives | (3,332) | (5,343)
Insured Credit Default Swaps [Member] |  |
Derivative [Line Items] |  |
Weighted Average Remaining Expected Maturity | 5.3 Years | 5.6 Years
Total Notional Value of Credit Derivatives | 48,852 | 65,557
Total Fair Value of Credit Derivatives | (3,243) | (4,716)
Insured Swaps [Member] |  |
Derivative [Line Items] |  |
Weighted Average Remaining Expected Maturity | 19.8 Years | 19.7 Years
Total Notional Value of Credit Derivatives | 6,017 | 7,156
Total Fair Value of Credit Derivatives | (9) | (9)
All Other [Member] |  |
Derivative [Line Items] |  |
Weighted Average Remaining Expected Maturity | 2.1 Years | 2.8 Years
Total Notional Value of Credit Derivatives | 195 | 195
Total Fair Value of Credit Derivatives | (80) | (91)
Non-Insured Credit Default Swaps-VIE [Member] |  |
Derivative [Line Items] |  |
Weighted Average Remaining Expected Maturity |  | 3.6 Years
Total Notional Value of Credit Derivatives |  | 643
Total Fair Value of Credit Derivatives |  | (527)
AAA [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 10,456 | 15,475
Total Fair Value of Credit Derivatives | (16) | (114)
AAA [Member] | Insured Credit Default Swaps [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 10,456 | 15,475
AA [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 7,706 | 12,229
Total Fair Value of Credit Derivatives | (81) | (116)
AA [Member] | Insured Credit Default Swaps [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 7,519 | 12,065
AA [Member] | Insured Swaps [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 187 | 164
A [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 8,958 | 10,606
Total Fair Value of Credit Derivatives | (148) | (205)
A [Member] | Insured Credit Default Swaps [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 5,196 | 6,336
A [Member] | Insured Swaps [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 3,762 | 4,270
BBB [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 13,808 | 16,631
Total Fair Value of Credit Derivatives | (1,001) | (1,355)
BBB [Member] | Insured Credit Default Swaps [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 11,811 | 14,042
BBB [Member] | Insured Swaps [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 1,997 | 2,589
Below Investment Grade [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 14,136 | 18,610
Total Fair Value of Credit Derivatives | (2,086) | (3,553)
Below Investment Grade [Member] | Insured Credit Default Swaps [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 13,870 | 17,639
Below Investment Grade [Member] | Insured Swaps [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 71 | 133
Below Investment Grade [Member] | All Other [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 195 | 195
Below Investment Grade [Member] | Non-Insured Credit Default Swaps-VIE [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives |  | $ 643

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- Definition Weighted Average Remaining Maturity Credit Derivatives In Years + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of credit risk derivative liabilities, which includes all such derivative instruments in hedging and non-hedging relationships that are recognized as liabilities on the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 17 -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. + Details
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- Definition Aggregate notional amount of credit risk derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 + Details
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