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Derivative Instruments (Credit Derivatives Sold) (Detail) (Insurance Operations [Member], USD $) In Millions, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | $ 32,401 | $ 53,014
Total Fair Value of Credit Derivatives | (1,655) | (2,934)
Credit Default Swap [Member] |  |
Derivative [Line Items] |  |
Weighted Average Remaining Expected Maturity | 2 years 9 months 18 days | 5 years 1 month 6 days
Total Notional Value of Credit Derivatives | 26,826 | 47,002
Total Fair Value of Credit Derivatives | (1,641) | (2,858)
Insured Swaps [Member] |  |
Derivative [Line Items] |  |
Weighted Average Remaining Expected Maturity | 19 years 2 months 12 days | 19 years 4 months 24 days
Total Notional Value of Credit Derivatives | 5,539 | 5,817
Total Fair Value of Credit Derivatives | (7) | (8)
Other Credit Derivatives [Member] |  |
Derivative [Line Items] |  |
Weighted Average Remaining Expected Maturity | 28 years 6 months 0 days | 1 year 9 months 18 days
Total Notional Value of Credit Derivatives | 36 | 195
Total Fair Value of Credit Derivatives | (7) | (68)
Credit Rating Aaa [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 7,418 | 10,457
Total Fair Value of Credit Derivatives | (4) | (7)
Credit Rating Aaa [Member] | Credit Default Swap [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 7,418 | 10,457
Credit Rating Aaa [Member] | Insured Swaps [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 0 | 0
Credit Rating Aaa [Member] | Other Credit Derivatives [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 0 | 0
Credit Rating Aa [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 3,301 | 5,965
Total Fair Value of Credit Derivatives | 0 | (70)
Credit Rating Aa [Member] | Credit Default Swap [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 3,217 | 5,862
Credit Rating Aa [Member] | Insured Swaps [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 84 | 103
Credit Rating Aa [Member] | Other Credit Derivatives [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 0 | 0
Credit Rating A [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 6,522 | 8,914
Total Fair Value of Credit Derivatives | (6) | (72)
Credit Rating A [Member] | Credit Default Swap [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 2,856 | 5,253
Credit Rating A [Member] | Insured Swaps [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 3,666 | 3,661
Credit Rating A [Member] | Other Credit Derivatives [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 0 | 0
Credit Rating Bbb [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 8,929 | 13,553
Total Fair Value of Credit Derivatives | (603) | (732)
Credit Rating Bbb [Member] | Credit Default Swap [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 7,140 | 11,571
Credit Rating Bbb [Member] | Insured Swaps [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 1,789 | 1,982
Credit Rating Bbb [Member] | Other Credit Derivatives [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 0 | 0
Credit Rating Below Investment Grade [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 6,231 | 14,125
Total Fair Value of Credit Derivatives | (1,042) | (2,053)
Credit Rating Below Investment Grade [Member] | Credit Default Swap [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 6,195 | 13,859
Credit Rating Below Investment Grade [Member] | Insured Swaps [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | 0 | 71
Credit Rating Below Investment Grade [Member] | Other Credit Derivatives [Member] |  |
Derivative [Line Items] |  |
Total Notional Value of Credit Derivatives | $ 36 | $ 195

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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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