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Investments (Details 3) (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 investment income
Investment income, before expense	$ 680	$ 698	$ 1,381	$ 1,387
Investment expense	(30)	(25)	(58)	(52)
Net investment income	650	673	1,323	1,335
Fixed income securities
Net investment income
Investment income, before expense	525	581	1,046	1,172
Mortgage loans
Net investment income
Investment income, before expense	85	85	170	173
Equity securities
Net investment income
Investment income, before expense	2	1	3	2
Limited partnership interests
Net investment income
Investment income, before expense	39	11	106	16
Short-term investments
Net investment income
Investment income, before expense				1
Other
Net investment income
Investment income, before expense	$ 29	$ 20	$ 56	$ 23

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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