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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
	Mar. 31, 2013	Mar. 31, 2012
Net other-than-temporary impairment losses recognized in earnings	$ 18	$ 27
Corporate and other bonds [Member]
Net other-than-temporary impairment losses recognized in earnings	3	10
Residential mortgage-backed [Member]
Net other-than-temporary impairment losses recognized in earnings		14
U.S. Treasury and obligations of government-sponsored enterprises [Member]
Net other-than-temporary impairment losses recognized in earnings		1
Total fixed maturity securities available-for-sale [Member]
Net other-than-temporary impairment losses recognized in earnings	3	25
Common stock [Member]
Net other-than-temporary impairment losses recognized in earnings		2
Preferred stock [Member]
Net other-than-temporary impairment losses recognized in earnings	15
Total equity securities available-for-sale [Member]
Net other-than-temporary impairment losses recognized in earnings	$ 15	$ 2

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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