Consolidated Statement of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities
Net income	$ 2,842	$ 3,662	$ 2,697
Adjustments to reconcile net income to net cash provided by operating activities:
Net realized investment (gains) losses	204	(171)	(2)
Depreciation and amortization	826	870	789
Deferred federal income tax expense (benefit)	(186)	62	(29)
Amortization of deferred acquisition costs	5,515	5,043	4,773
Equity in income from other investments	(336)	(993)	(130)
Premiums receivable	(877)	(258)	94
Reinsurance recoverables	344	(101)	(162)
Deferred acquisition costs	(5,824)	(5,227)	(4,854)
Claims and claim adjustment expense reserves	2,050	2,388	2,622
Unearned premium reserves	1,862	1,249	592
Other operating activities	45	750	129
Net cash provided by operating activities	6,465	7,274	6,519
Cash flows from investing activities
Proceeds from maturities of fixed maturities	6,837	8,852	7,387
Proceeds from sales of investments:
Fixed maturities	5,657	3,165	3,057
Equity securities	138	102	116
Real estate investments	10	31	0
Other investments	302	427	276
Purchases of investments:
Fixed maturities	(15,908)	(18,153)	(14,073)
Equity securities	(136)	(407)	(127)
Real estate investments	(41)	(28)	(113)
Other investments	(574)	(520)	(472)
Net sales (purchases) of short-term securities	355	1,671	(566)
Securities transactions in the course of settlement	21	(19)	(47)
Acquisitions, net of cash acquired	(4)	(38)	0
Other investing activities	(385)	(279)	(330)
Net cash used in investing activities	(3,728)	(5,196)	(4,892)
Cash flows from financing activities
Treasury stock acquired — share repurchase authorization	(2,000)	(2,156)	(625)
Treasury stock acquired — net employee share-based compensation	(61)	(44)	(47)
Dividends paid to shareholders	(875)	(869)	(861)
Payment of debt	0	0	(500)
Issuance of debt	0	739	490
Issuance of common stock -- employee share options	267	293	127
Net cash used in financing activities	(2,669)	(2,037)	(1,416)
Effect of exchange rate changes on cash	(30)	(1)	16
Net increase in cash	38	40	227
Cash at beginning of year	761	721	494
Cash at end of year	799	761	721
Supplemental disclosure of cash flow information
Income taxes paid	817	707	578
Interest paid	$ 349	$ 337	$ 339