Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities
Net (loss) income	$ (1,364)	$ 1,566	$ 5,576
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and other non-cash items	847	1,086	686
Net (gains) losses on investments and derivatives	1,072	(1,279)	(1,356)
Pension and other postretirement remeasurement (gains) losses	116	(644)	(51)
Amortization of deferred gain on reinsurance	0	(4)	(4)
Loss on disposition of operations, net of tax	0	4,031	0
Changes in:
Accident, health and other policy benefits	4,503	2,432	(44)
Unearned premiums	2,541	1,618	598
Deferred policy acquisition costs	(702)	(608)	(125)
Premium installment receivables, net	(1,038)	(498)	(3)
Reinsurance recoverables, net	408	(1,565)	(11)
Income taxes	(721)	349	(232)
Other operating assets and liabilities	(541)	(1,368)	457
Net cash provided by operating activities	5,121	5,116	5,491
Proceeds from sales
Fixed income securities	31,494	31,774	31,950
Equity securities	10,969	4,513	8,405
Limited partnership interests	970	886	1,350
Mortgage loans	0	0	230
Other investments	1,071	1,406	340
Investment collections
Fixed income securities	728	2,284	2,235
Mortgage loans	163	860	626
Other investments	167	550	209
Investment purchases
Fixed income securities	(36,920)	(33,857)	(38,121)
Equity securities	(9,294)	(6,409)	(4,648)
Limited partnership interests	(1,258)	(1,766)	(1,265)
Mortgage loans	(104)	(221)	(203)
Other investments	(295)	(1,647)	(371)
Change in short-term and other investments, net	792	4,017	(3,871)
Purchases of property and equipment, net	(420)	(345)	(308)
Proceeds from sale of property and equipment	209	0	0
Acquisition of operations, net of cash acquired	0	(3,593)	1
Proceeds from disposition of operations, net of cash transferred	0	2,058	0
Net cash (used in) provided by investing activities	(1,728)	510	(3,441)
Cash flows from financing activities
Proceeds from issuance of debt	0	0	1,189
Redemption and repayment of debt	0	(436)	0
Redemption of preferred stock	0	(450)	(288)
Contractholder fund deposits	133	826	991
Contractholder fund withdrawals	(49)	(1,140)	(1,494)
Dividends paid on common stock	(926)	(885)	(668)
Dividends paid on preferred stock	(105)	(114)	(108)
Treasury stock purchases	(2,520)	(3,120)	(1,737)
Shares reissued under equity incentive plans, net	82	114	63
Other	(35)	(35)	41
Net cash used in financing activities	(3,420)	(5,240)	(2,011)
Net (decrease) increase in cash, including cash classified as assets held for sale	(27)	386	39
Cash from continuing operations at beginning of period	763	311	273
Cash classified as assets held for sale at beginning of period	0	66	65
Less: Cash classified as assets held for sale at end of period	0	0	66
Cash from continuing operations at end of period	$ 736	$ 763	$ 311