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Investments (details) - Impairment Charges (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Impairment charges
Impairment charges	$ 25	$ 26	$ 258
Fixed maturities [Member]
Impairment charges
Impairment charges	18	13	169
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities [Member]
Impairment charges
Impairment charges	13	4	81
All other corporate bonds [Member]
Impairment charges
Impairment charges	5	9	88
Equity securities [Member]
Impairment charges
Impairment charges	6	3	79
Equity securities, common stock [Member]
Impairment charges
Impairment charges	6	2	15
Equity securities, non-redeemable preferred stock [Member]
Impairment charges
Impairment charges		1	64
Other investments [Member]
Impairment charges
Impairment charges	$ 1	$ 10	$ 10

The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

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