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Investments (details) - Net Investment Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net investment income
Gross investment income	$ 2,925	$ 2,910	$ 3,093
Fixed maturities [Member]
Net investment income
Gross investment income	2,439	2,543	2,710
Equity securities [Member]
Net investment income
Gross investment income	28	29	31
Short-term securities [Member]
Net investment income
Gross investment income	10	12	13
Real estate [Member]
Net investment income
Gross investment income	34	34	35
Other investments [Member]
Net investment income
Gross investment income	$ 414	$ 292	$ 304

Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.

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