CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities
Net income	$ 695	$ 246
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and other non-cash items	119	91
Realized capital gains and losses	(134)	149
Gain on disposition of operations	(2)	(2)
Interest credited to contractholder funds	173	190
Changes in:
Policy benefits and other insurance reserves	183	459
Unearned premiums	(248)	(205)
Deferred policy acquisition costs	14	(7)
Premium installment receivables, net	(19)	11
Reinsurance recoverables, net	11	(40)
Income taxes	284	(26)
Other operating assets and liabilities	(219)	(152)
Net cash provided by operating activities	857	714
Proceeds from sales
Fixed income securities	7,083	6,216
Equity securities	2,601	1,664
Limited partnership interests	210	180
Other investments	24	94
Investment collections
Fixed income securities	1,029	949
Mortgage loans	223	79
Other investments	174	43
Investment purchases
Fixed income securities	(8,800)	(5,401)
Equity securities	(2,383)	(1,733)
Limited partnership interests	(268)	(270)
Mortgage loans	(86)	(44)
Other investments	(219)	(253)
Change in short-term investments, net	1,572	(1,357)
Change in other investments, net	(10)	(19)
Purchases of property and equipment, net	(74)	(52)
Acquisition of operations	(1,356)	0
Net cash (used in) provided by investing activities	(280)	96
Cash flows from financing activities
Repayments of long-term debt	0	(16)
Contractholder fund deposits	257	261
Contractholder fund withdrawals	(483)	(492)
Dividends paid on common stock	(122)	(115)
Dividends paid on preferred stock	(29)	(29)
Treasury stock purchases	(264)	(456)
Shares reissued under equity incentive plans, net	67	30
Excess tax benefits on share-based payment arrangements	0	12
Other	3	31
Net cash used in financing activities	(571)	(774)
Net increase in cash	6	36
Cash at beginning of period	436	495
Cash at end of period	$ 442	$ 531