Derivative Instruments (Summary Of Credit Derivatives Sold) (Details) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Insurance Operations [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives	$ 94,048	$ 112,765
Total Fair Value of Credit Derivatives	(6,374)	(5,830)
Insurance Operations [Member] | Credit Rating AAA [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives	16,132	20,721
Total Fair Value of Credit Derivatives	(147)	(41)
Insurance Operations [Member] | Credit Rating AAA [Member] | Insured Credit Default Swaps [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives	16,132	20,721
Insurance Operations [Member] | Credit Rating AA [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives	16,304	18,851
Total Fair Value of Credit Derivatives	(114)	(86)
Insurance Operations [Member] | Credit Rating AA [Member] | Insured Credit Default Swaps [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives	16,023	18,530
Insurance Operations [Member] | Credit Rating AA [Member] | Insured Swaps [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives	281	321
Insurance Operations [Member] | Credit Rating A [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives	11,323	16,237
Total Fair Value of Credit Derivatives	(147)	(315)
Insurance Operations [Member] | Credit Rating A [Member] | Insured Credit Default Swaps [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives	7,000	11,323
Insurance Operations [Member] | Credit Rating A [Member] | Insured Swaps [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives	4,323	4,801
Insurance Operations [Member] | Credit Rating A [Member] | All Others [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives		113
Insurance Operations [Member] | Credit Rating BBB [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives	19,454	20,096
Total Fair Value of Credit Derivatives	(1,052)	(477)
Insurance Operations [Member] | Credit Rating BBB [Member] | Insured Credit Default Swaps [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives	16,791	15,356
Insurance Operations [Member] | Credit Rating BBB [Member] | Insured Swaps [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives	2,663	4,740
Insurance Operations [Member] | Credit Rating Below BBB [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives	30,835	36,860
Total Fair Value of Credit Derivatives	(4,914)	(4,911)
Insurance Operations [Member] | Credit Rating Below BBB [Member] | Insured Credit Default Swaps [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives	28,022	33,377
Insurance Operations [Member] | Credit Rating Below BBB [Member] | Non-Insured Credit Default Swaps-VIE [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives	2,476	2,612
Insurance Operations [Member] | Credit Rating Below BBB [Member] | Insured Swaps [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives	142	676
Insurance Operations [Member] | Credit Rating Below BBB [Member] | All Others [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives	195	195
Insurance Operations [Member] | Insured Credit Default Swaps [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives	83,968	99,307
Total Fair Value of Credit Derivatives	(4,838)	(4,325)
Weighted Average Remaining Maturity credit derivatives in years	6.0Y	7.6 Y
Insurance Operations [Member] | Non-Insured Credit Default Swaps-VIE [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives	2,476	2,612
Total Fair Value of Credit Derivatives	(1,473)	(1,455)
Weighted Average Remaining Maturity credit derivatives in years	4.1Y	4.8Y
Insurance Operations [Member] | Insured Swaps [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives	7,409	10,538
Total Fair Value of Credit Derivatives	(9)	(11)
Weighted Average Remaining Maturity credit derivatives in years	20.2Y	16.6Y
Insurance Operations [Member] | All Others [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives	195	308
Total Fair Value of Credit Derivatives	(54)	(39)
Weighted Average Remaining Maturity credit derivatives in years	3.1Y	8.5Y
Asset / Liability Products [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives	4,331	4,237
Total Fair Value of Credit Derivatives
Asset / Liability Products [Member] | Credit Rating AAA [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives	4,331	4,237
Total Fair Value of Credit Derivatives
Asset / Liability Products [Member] | Credit Rating AAA [Member] | Principal Protection Guarantees [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives	4,331	4,237
Asset / Liability Products [Member] | Credit Rating AA [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives
Total Fair Value of Credit Derivatives
Asset / Liability Products [Member] | Credit Rating AA [Member] | Principal Protection Guarantees [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives
Asset / Liability Products [Member] | Credit Rating A [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives
Total Fair Value of Credit Derivatives
Asset / Liability Products [Member] | Credit Rating A [Member] | Principal Protection Guarantees [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives
Asset / Liability Products [Member] | Credit Rating BBB [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives
Total Fair Value of Credit Derivatives
Asset / Liability Products [Member] | Credit Rating BBB [Member] | Principal Protection Guarantees [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives
Asset / Liability Products [Member] | Credit Rating Below BBB [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives
Total Fair Value of Credit Derivatives
Asset / Liability Products [Member] | Credit Rating Below BBB [Member] | Principal Protection Guarantees [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives
Asset / Liability Products [Member] | Principal Protection Guarantees [Member]
Derivative [Line Items]
Total Notional Value of Credit Derivatives	4,331	4,237
Total Fair Value of Credit Derivatives
Weighted Average Remaining Maturity credit derivatives in years	0.3Y	1.0Y