CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities
Net income	$ 709	$ 766
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and other non-cash items	87	96
Realized capital gains and losses	(131)	(168)
Gain on disposition of operations	(2)	(3)
Interest credited to contractholder funds	345	378
Changes in:
Policy benefits and other insurance reserves	(514)	(346)
Unearned premiums	(146)	(180)
Deferred policy acquisition costs	(30)	52
Premium installment receivables, net	(22)	19
Reinsurance recoverables, net	406	57
Income taxes	277	333
Other operating assets and liabilities	(239)	(197)
Net cash provided by operating activities	740	807
Proceeds from sales
Fixed income securities	5,474	5,689
Equity securities	210	1,059
Limited partnership interests	160	403
Mortgage loans	2	6
Other investments	15	36
Investment collections
Fixed income securities	1,745	966
Mortgage loans	237	170
Other investments	54	23
Investment purchases
Fixed income securities	(6,084)	(7,008)
Equity securities	(317)	(128)
Limited partnership interests	(255)	(318)
Mortgage loans	(75)	(216)
Other investments	(196)	(163)
Change in short-term investments, net	(808)	(379)
Change in other investments, net	34	(9)
Purchases of property and equipment, net	(60)	(51)
Disposition of operations		(1)
Net cash provided by investing activities	136	79
Cash flows from financing activities
Proceeds from issuance of long-term debt	492	493
Repayment of long-term debt		(350)
Contractholder fund deposits	591	485
Contractholder fund withdrawals	(1,259)	(1,299)
Dividends paid		(106)
Treasury stock purchases	(739)	(309)
Shares reissued under equity incentive plans, net	17	15
Excess tax benefits on share-based payment arrangements	23	(1)
Other	13	(13)
Net cash used in financing activities	(862)	(1,085)
Net increase (decrease) in cash	14	(199)
Cash at beginning of period	806	776
Cash at end of period	$ 820	$ 577