Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities
Net income	$ 2,521	$ 1,940
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and other non-cash items	376	358
Realized capital gains and losses	(17)	(318)
Gain on disposition of operations	(4)	(15)
Interest credited to contractholder funds	489	522
Changes in:
Policy benefits and other insurance reserves	90	1,276
Unearned premiums	785	525
Deferred policy acquisition costs	(203)	(176)
Premium installment receivables, net	(422)	(267)
Reinsurance recoverables, net	(103)	(1,017)
Income taxes	(227)	119
Other operating assets and liabilities	533	267
Net cash provided by operating activities	3,818	3,214
Proceeds from sales
Fixed income securities	26,223	19,508
Equity securities	4,637	5,179
Limited partnership interests	490	767
Other investments	234	170
Investment collections
Fixed income securities	2,388	3,038
Mortgage loans	378	477
Other investments	370	458
Investment purchases
Fixed income securities	(29,049)	(23,935)
Equity securities	(4,791)	(5,296)
Limited partnership interests	(1,317)	(1,082)
Mortgage loans	(435)	(311)
Other investments	(686)	(700)
Change in short-term investments, net	(665)	2,257
Change in other investments, net	(28)	(28)
Purchases of property and equipment, net	(195)	(216)
Acquisition of operations	(10)	(1,356)
Net cash used in investing activities	(2,456)	(1,070)
Cash flows from financing activities
Proceeds from issuance of long-term debt	498	0
Redemption and repayment of long-term debt	(401)	0
Proceeds from issuance of preferred stock	557	0
Contractholder fund deposits	756	767
Contractholder fund withdrawals	(1,474)	(1,416)
Dividends paid on common stock	(455)	(391)
Dividends paid on preferred stock	(97)	(87)
Treasury stock purchases	(1,062)	(848)
Shares reissued under equity incentive plans, net	66	132
Other	93	(47)
Net cash used in financing activities	(1,519)	(1,890)
Net (decrease) increase in cash	(157)	254
Cash at beginning of period	617	436
Cash at end of period	$ 460	$ 690