Consolidated Statement of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities
Net income	$ 2,991	$ 2,842	$ 3,662
Adjustments to reconcile net income to net cash provided by operating activities:
Net realized investment (gains) losses	105	204	(171)
Depreciation and amortization	722	826	870
Deferred federal income tax expense (benefit)	(163)	(186)	62
Amortization of deferred acquisition costs	6,226	5,515	5,043
Equity in income from other investments	(157)	(336)	(993)
Premiums receivable	(1,341)	(877)	(258)
Reinsurance recoverables	(63)	344	(101)
Deferred acquisition costs	(6,689)	(5,824)	(5,227)
Claims and claim adjustment expense reserves	2,843	2,050	2,388
Unearned premium reserves	2,590	1,862	1,249
Other operating activities	647	45	750
Net cash provided by operating activities	7,711	6,465	7,274
Cash flows from investing activities
Proceeds from maturities of fixed maturities	6,371	6,837	8,852
Proceeds from sales of investments:
Fixed maturities	4,981	5,657	3,165
Equity securities	138	138	102
Real estate investments	0	10	31
Other investments	255	302	427
Purchases of investments:
Fixed maturities	(15,690)	(15,908)	(18,153)
Equity securities	(105)	(136)	(407)
Real estate investments	(67)	(41)	(28)
Other investments	(495)	(574)	(520)
Net sales (purchases) of short-term securities	(1,664)	355	1,671
Securities transactions in the course of settlement	(83)	21	(19)
Acquisitions, net of cash acquired	0	(4)	(38)
Other investing activities	(462)	(385)	(279)
Net cash used in investing activities	(6,821)	(3,728)	(5,196)
Cash flows from financing activities
Treasury stock acquired — share repurchase authorizations	(958)	(2,000)	(2,156)
Treasury stock acquired — net employee share-based compensation	(64)	(61)	(44)
Dividends paid to shareholders	(908)	(875)	(869)
Issuance of debt	738	0	739
Issuance of common stock — employee share options	141	267	293
Net cash used in financing activities	(1,051)	(2,669)	(2,037)
Effect of exchange rate changes on cash	12	(30)	(1)
Net increase (decrease) in cash	(149)	38	40
Cash at beginning of year	799	761	721
Cash at end of year	650	799	761
Supplemental disclosure of cash flow information
Income taxes paid	201	817	707
Interest paid	$ 370	$ 349	$ 337