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Investments (Components of other-than-temporary impairment losses recognized in earnings) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net OTTI Losses
Net other-than-temporary impairment losses recognized in earnings	$ 23	$ 62	$ 50	$ 103
Corporate and other bonds [Member]
Net OTTI Losses
Net other-than-temporary impairment losses recognized in earnings	6	15	16	24
Residential mortgage-backed [Member]
Net OTTI Losses
Net other-than-temporary impairment losses recognized in earnings	15	46	29	74
U.S. Treasury and obligations of government-sponsored enterprises [Member]
Net OTTI Losses
Net other-than-temporary impairment losses recognized in earnings			1
Total fixed maturity securities available-for-sale [Member]
Net OTTI Losses
Net other-than-temporary impairment losses recognized in earnings	21	61	46	98
Common stock [Member]
Net OTTI Losses
Net other-than-temporary impairment losses recognized in earnings	2	1	4	4
Preferred stock [Member]
Net OTTI Losses
Net other-than-temporary impairment losses recognized in earnings				1
Total equity securities available-for-sale [Member]
Net OTTI Losses
Net other-than-temporary impairment losses recognized in earnings	$ 2	$ 1	$ 4	$ 5

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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