Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities
Net income	$ 1,566	$ 5,576	$ 4,847
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and other non-cash items	1,086	686	647
Net (gains) losses on investments and derivatives	(1,279)	(1,356)	(1,885)
Pension and other postretirement remeasurement (gains) losses	(644)	(51)	114
Amortization of deferred gain on reinsurance	(4)	(4)	(6)
Interest credited to contractholder funds	448	638	640
Impairment of purchased intangibles	0	0	106
Loss on disposition of operations, net of tax	4,031	0	0
Changes in:
Policy benefits and other insurance reserves	1,984	(682)	(508)
Unearned premiums	1,618	598	801
Deferred policy acquisition costs	(608)	(125)	(85)
Premium installment receivables, net	(498)	(3)	(299)
Reinsurance recoverables, net	(1,565)	(11)	320
Income taxes	349	(232)	487
Other operating assets and liabilities	(1,368)	457	(50)
Net cash provided by operating activities	5,116	5,491	5,129
Proceeds from sales
Fixed income securities	31,774	31,950	29,849
Equity securities	4,513	8,405	5,277
Limited partnership interests	886	1,350	756
Mortgage loans	0	230	0
Other investments	1,406	340	303
Investment collections
Fixed income securities	2,284	2,235	2,570
Mortgage loans	860	626	695
Other investments	550	209	254
Investment purchases
Fixed income securities	(33,857)	(38,121)	(31,317)
Equity securities	(6,409)	(4,648)	(7,176)
Limited partnership interests	(1,766)	(1,265)	(1,332)
Mortgage loans	(221)	(203)	(844)
Other investments	(1,647)	(371)	(666)
Change in short-term and other investments, net	4,017	(3,871)	(725)
Purchases of property and equipment, net	(345)	(308)	(433)
Acquisition of operations, net of cash acquired	(3,593)	1	(18)
Proceeds from disposition of operations, net of cash transferred	2,058	0	0
Net cash provided by (used in) investing activities	510	(3,441)	(2,807)
Cash flows from financing activities
Proceeds from issuance of long-term debt	0	1,189	491
Redemption and repayment of long-term debt	(436)	0	(317)
Proceeds from issuance of preferred stock	0	0	(1,132)
Redemption of preferred stock	(450)	(288)	1,414
Contractholder fund deposits	826	991	996
Contractholder fund withdrawals	(1,140)	(1,494)	(1,662)
Dividends paid on common stock	(885)	(668)	(653)
Dividends paid on preferred stock	(114)	(108)	(134)
Treasury stock purchases	(3,120)	(1,737)	(1,735)
Shares reissued under equity incentive plans, net	114	63	120
Other	(35)	41	129
Net cash used in financing activities	(5,240)	(2,011)	(2,483)
Net increase (decrease) in cash, including cash classified as assets held for sale	386	39	(161)
Cash from continuing operations at beginning of period	311	273	425
Cash classified as assets held for sale at beginning of period	66	65	74
Less: Cash classified as assets held for sale at end of period	0	66	65
Cash from continuing operations at end of period	$ 763	$ 311	$ 273