Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Cash flows from operating activities
Net income	$ 549	$ 1,292
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and other non-cash items	155	157
Realized capital (gains) losses	462	(662)
Pension and other postretirement remeasurement (gains) losses	318	15
Gain on disposition of operations	(1)	(1)
Interest credited to contractholder funds	132	162
Increase (Decrease) in Future Policy Benefit Reserves and Other Insurance Liabilities	(654)	(114)
Changes in:
Unearned premiums	(272)	(201)
Deferred policy acquisition costs	38	33
Premium installment receivables, net	26	(39)
Reinsurance recoverables, net	24	179
Income taxes	28	303
Other operating assets and liabilities	222	(410)
Net cash provided by operating activities	1,027	714
Proceeds from sales
Fixed income securities	12,114	9,034
Equity securities	5,250	633
Limited partnership interests	749	241
Other investments	116	44
Investment collections
Fixed income securities	555	628
Mortgage loans	118	104
Other investments	61	68
Investment purchases
Fixed income securities	(14,667)	(9,056)
Equity securities	(1,619)	(871)
Limited partnership interests	(357)	(282)
Mortgage loans	(142)	(114)
Other investments	(129)	(89)
Change in short-term investments, net	(1,953)	(552)
Change in other investments, net	37	47
Purchases of property and equipment, net	(65)	(80)
Acquisition of operations	0	(18)
Net cash provided by (used in) investing activities	68	(263)
Cash flows from financing activities
Redemption of preferred stock	(288)		$ 0
Contractholder fund deposits	246	254
Contractholder fund withdrawals	(471)	(458)
Dividends paid on common stock	(159)	(158)
Dividends paid on preferred stock	(29)	(31)
Treasury stock purchases	(414)	0
Shares reissued under equity incentive plans, net	8	(5)
Other	12	(1)
Net cash used in financing activities	(1,095)	(399)
Net increase in cash	0	52
Cash at beginning of period	338	499	499
Cash at end of period	$ 338	$ 551	$ 338