Consolidated Statement 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	$ 3,662	$ 2,697	$ 2,622
Adjustments to reconcile net income to net cash provided by operating activities:
Net realized investment gains	(171)	(2)	(113)
Depreciation and amortization	870	789	763
Deferred federal income tax expense (benefit)	62	(29)	(33)
Amortization of deferred acquisition costs	5,043	4,773	4,601
Equity in income from other investments	(993)	(130)	(251)
Premiums receivable	(258)	94	(384)
Reinsurance recoverables	(101)	(162)	157
Deferred acquisition costs	(5,227)	(4,854)	(4,747)
Claims and claim adjustment expense reserves	2,388	2,622	1,047
Unearned premium reserves	1,249	592	1,008
Other operating activities	750	129	535
Net cash provided by operating activities	7,274	6,519	5,205
Cash flows from investing activities
Proceeds from maturities of fixed maturities	8,852	7,387	6,845
Proceeds from sales of investments:
Fixed maturities	3,165	3,057	2,187
Equity securities	102	116	165
Real estate investments	31	0	0
Other investments	427	276	434
Purchases of investments:
Fixed maturities	(18,153)	(14,073)	(10,711)
Equity securities	(407)	(127)	(100)
Real estate investments	(28)	(113)	(107)
Other investments	(520)	(472)	(491)
Net sales (purchases) of short-term securities	1,671	(566)	(957)
Securities transactions in the course of settlement	(19)	(47)	158
Acquisition, net of cash acquired	(38)	0	0
Other investing activities	(279)	(330)	(325)
Net cash used in investing activities	(5,196)	(4,892)	(2,902)
Cash flows from financing activities
Treasury stock acquired — share repurchase authorization	(2,156)	(625)	(1,500)
Treasury stock acquired — net employee share-based compensation	(44)	(47)	(48)
Dividends paid to shareholders	(869)	(861)	(844)
Payment of debt	0	(500)	(500)
Issuance of debt	739	490	492
Issuance of common stock -- employee share options	293	127	213
Net cash used in financing activities	(2,037)	(1,416)	(2,187)
Effect of exchange rate changes on cash	(1)	16	5
Net increase in cash	40	227	121
Cash at beginning of year	721	494	373
Cash at end of year	761	721	494
Supplemental disclosure of cash flow information
Income taxes paid	707	578	428
Interest paid	$ 337	$ 339	$ 338