Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities
Net income	$ 1,292	$ 1,006
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and other non-cash items	157	122
Realized capital gains and losses	(662)	134
Pension and other postretirement remeasurement gains and losses	15	14
Gain on disposition of operations	(1)	(1)
Interest credited to contractholder funds	162	161
Changes in:
Policy benefits and other insurance reserves	(114)	(364)
Unearned premiums	(201)	(204)
Deferred policy acquisition costs	33	10
Premium installment receivables, net	(39)	(58)
Reinsurance recoverables, net	179	(12)
Income taxes	303	189
Other operating assets and liabilities	(410)	(371)
Net cash provided by operating activities	714	626
Proceeds from sales
Fixed income securities	9,034	10,619
Equity securities	633	1,138
Limited partnership interests	241	53
Other investments	44	76
Investment collections
Fixed income securities	628	583
Mortgage loans	104	46
Other investments	68	122
Investment purchases
Fixed income securities	(9,056)	(9,789)
Equity securities	(871)	(1,535)
Limited partnership interests	(282)	(415)
Mortgage loans	(114)	(192)
Other investments	(89)	(330)
Change in short-term investments, net	(552)	(1,533)
Change in other investments, net	47	(27)
Purchases of property and equipment, net	(80)	(62)
Acquisition of operations	(18)	(5)
Net cash used in investing activities	(263)	(1,251)
Cash flows from financing activities
Proceeds from issuance of long-term debt	0	498
Proceeds from issuance of preferred stock	0	558
Contractholder fund deposits	254	253
Contractholder fund withdrawals	(458)	(492)
Dividends paid on common stock	(158)	(132)
Dividends paid on preferred stock	(31)	(29)
Treasury stock purchases	0	(270)
Shares reissued under equity incentive plans, net	(5)	10
Other	(1)	62
Net cash (used in) provided by financing activities	(399)	458
Net increase (decrease) in cash	52	(167)
Cash at beginning of period	499	617
Cash at end of period	$ 551	$ 450