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Investments (Details 5) (USD $) In Millions	3 Months Ended		9 Months Ended
Investments (Details 5) (USD $) In Millions	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments
Realized before impairments	$ 18	$ 68	$ 68	$ 120
Realized - impairments	(10)	(11)	(41)	(48)
Fixed Maturity Securities [Member]
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments
Realized before impairments	27	46	51	115
Realized - impairments	(12)	(12)	(49)	(62)
Change in unrealized	172	498	417	1,131
Equity Securities [Member]
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments
Realized before impairments	6	27	41	29
Realized - impairments	(2)	(1)	(2)	(1)
Change in unrealized	(75)	(8)	(77)	(11)
Mortgage Loans and other investments [Member]
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments
Realized before impairments	(15)	(1)	(22)	(15)
Realized - impairments		(2)	(4)	(5)
Other [Member]
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments
Realized before impairments		(4)	(2)	(9)
Realized - impairments	4	4	14	20
Change in unrealized	(100)	(177)	(194)	(434)
Tax Effects [Member]
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments
Realized before impairments	(6)	(23)	(24)	(41)
Realized - impairments	3	4	14	17
Change in unrealized	2	(109)	(51)	(240)
Noncontrolling Interests [Member]
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments
Realized before impairments		(1)	(1)	(2)
Change in unrealized	(2)	(4)	(4)	(6)
Marketable Securities [Member]
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments
Realized before impairments	12	44	43	77
Realized - impairments	(7)	(7)	(27)	(31)
Change in unrealized	$ (3)	$ 200	$ 91	$ 440

The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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