Derivative Instruments (Summary Of Credit Derivatives Sold) (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Insurance Operations [Member]
Total Notional Value of Credit Derivatives	$ 103,003	$ 112,765
Total Fair Value of Credit Derivatives	(7,268)	(5,830)
Insurance Operations [Member] \| Credit Rating AAA [Member]
Total Notional Value of Credit Derivatives	16,403	20,721
Total Fair Value of Credit Derivatives	(56)	(41)
Insurance Operations [Member] \| Credit Rating AAA [Member] \| Insured Credit Default Swaps [Member]
Total Notional Value of Credit Derivatives	16,403	20,721
Insurance Operations [Member] \| Credit Rating AA [Member]
Total Notional Value of Credit Derivatives	17,687	18,851
Total Fair Value of Credit Derivatives	(133)	(86)
Insurance Operations [Member] \| Credit Rating AA [Member] \| Insured Credit Default Swaps [Member]
Total Notional Value of Credit Derivatives	17,385	18,530
Insurance Operations [Member] \| Credit Rating AA [Member] \| Insured Swaps [Member]
Total Notional Value of Credit Derivatives	302	321
Insurance Operations [Member] \| Credit Rating A [Member]
Total Notional Value of Credit Derivatives	13,417	16,237
Total Fair Value of Credit Derivatives	(175)	(315)
Insurance Operations [Member] \| Credit Rating A [Member] \| Insured Credit Default Swaps [Member]
Total Notional Value of Credit Derivatives	9,057	11,323
Insurance Operations [Member] \| Credit Rating A [Member] \| Insured Swaps [Member]
Total Notional Value of Credit Derivatives	4,360	4,801
Insurance Operations [Member] \| Credit Rating A [Member] \| All Others [Member]
Total Notional Value of Credit Derivatives		113
Insurance Operations [Member] \| Credit Rating BBB [Member]
Total Notional Value of Credit Derivatives	20,446	20,096
Total Fair Value of Credit Derivatives	(1,135)	(477)
Insurance Operations [Member] \| Credit Rating BBB [Member] \| Insured Credit Default Swaps [Member]
Total Notional Value of Credit Derivatives	17,172	15,356
Insurance Operations [Member] \| Credit Rating BBB [Member] \| Insured Swaps [Member]
Total Notional Value of Credit Derivatives	3,274	4,740
Insurance Operations [Member] \| Credit Rating Below BBB [Member]
Total Notional Value of Credit Derivatives	35,050	36,860
Total Fair Value of Credit Derivatives	(5,769)	(4,911)
Insurance Operations [Member] \| Credit Rating Below BBB [Member] \| Insured Credit Default Swaps [Member]
Total Notional Value of Credit Derivatives	32,144	33,377
Insurance Operations [Member] \| Credit Rating Below BBB [Member] \| Non-Insured Credit Default Swaps-VIE [Member]
Total Notional Value of Credit Derivatives	2,558	2,612
Insurance Operations [Member] \| Credit Rating Below BBB [Member] \| Insured Swaps [Member]
Total Notional Value of Credit Derivatives	153	676
Insurance Operations [Member] \| Credit Rating Below BBB [Member] \| All Others [Member]
Total Notional Value of Credit Derivatives	195	195
Insurance Operations [Member] \| Insured Credit Default Swaps [Member]
Total Notional Value of Credit Derivatives	92,161	99,307
Total Fair Value of Credit Derivatives	5,595	(4,325)
Weighted average remaining maturity credit derivatives in years	6.2Y	7.6Y
Insurance Operations [Member] \| Non-Insured Credit Default Swaps-VIE [Member]
Total Notional Value of Credit Derivatives	2,558	2,612
Total Fair Value of Credit Derivatives	1,590	(1,455)
Weighted average remaining maturity credit derivatives in years	4.8Y	4.8Y
Insurance Operations [Member] \| Insured Swaps [Member]
Total Notional Value of Credit Derivatives	8,089	10,538
Total Fair Value of Credit Derivatives	10	(11)
Weighted average remaining maturity credit derivatives in years	18.9Y	16.6Y
Insurance Operations [Member] \| All Others [Member]
Total Notional Value of Credit Derivatives	195	308
Total Fair Value of Credit Derivatives	73	(39)
Weighted average remaining maturity credit derivatives in years	3.3Y	8.5Y
Asset / Liability Products [Member]
Total Notional Value of Credit Derivatives	4,995	4,237
Total Fair Value of Credit Derivatives
Asset / Liability Products [Member] \| Credit Rating AAA [Member]
Total Notional Value of Credit Derivatives	4,995	4,237
Total Fair Value of Credit Derivatives
Asset / Liability Products [Member] \| Credit Rating AAA [Member] \| Principal Protection Guarantees [Member]
Total Notional Value of Credit Derivatives	4,995	4,237
Asset / Liability Products [Member] \| Credit Rating AA [Member]
Total Notional Value of Credit Derivatives
Total Fair Value of Credit Derivatives
Asset / Liability Products [Member] \| Credit Rating AA [Member] \| Principal Protection Guarantees [Member]
Total Notional Value of Credit Derivatives
Asset / Liability Products [Member] \| Credit Rating A [Member]
Total Notional Value of Credit Derivatives
Total Fair Value of Credit Derivatives
Asset / Liability Products [Member] \| Credit Rating A [Member] \| Principal Protection Guarantees [Member]
Total Notional Value of Credit Derivatives
Asset / Liability Products [Member] \| Credit Rating BBB [Member]
Total Notional Value of Credit Derivatives
Total Fair Value of Credit Derivatives
Asset / Liability Products [Member] \| Credit Rating BBB [Member] \| Principal Protection Guarantees [Member]
Total Notional Value of Credit Derivatives
Asset / Liability Products [Member] \| Credit Rating Below BBB [Member]
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]
Total Notional Value of Credit Derivatives
Asset / Liability Products [Member] \| Principal Protection Guarantees [Member]
Total Notional Value of Credit Derivatives	4,995	4,237
Total Fair Value of Credit Derivatives
Weighted average remaining maturity credit derivatives in years	0.5Y	1Y