Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities
Net income	$ 733	$ 600
Adjustments to reconcile net income to net cash provided by operating activities:
Net realized investment (gains) losses	(44)	98
Depreciation and amortization	235	203
Deferred federal income tax expense	56	6
Amortization of deferred acquisition costs	1,207	1,178
Equity in income from other investments	(200)	(67)
Premiums receivable	(333)	(326)
Reinsurance recoverables	12	(15)
Deferred acquisition costs	(1,258)	(1,215)
Claims and claim adjustment expense reserves	777	388
Unearned premium reserves	509	414
Other operating activities	(504)	(636)
Net cash provided by operating activities	1,190	628
Cash flows from investing activities
Proceeds from maturities of fixed maturities	2,064	1,461
Proceeds from sales of investments:
Fixed maturities	1,238	388
Equity securities	25	33
Other investments	79	64
Purchases of investments:
Fixed maturities	(4,754)	(2,630)
Equity securities	(19)	(35)
Real estate investments	(5)	(16)
Other investments	(97)	(103)
Net sales of short-term securities	524	906
Securities transactions in course of settlement	269	85
Acquisition, net of cash acquired	(38)	0
Other investing activities	(60)	(69)
Net cash provided by (used in) investing activities	(774)	84
Cash flows from financing activities
Treasury stock acquired — share repurchase authorization	(356)	(425)
Treasury stock acquired — net employee share-based compensation	(41)	(46)
Dividends paid to shareholders	(214)	(210)
Issuance of common stock — employee share options	134	31
Net cash used in financing activities	(477)	(650)
Effect of exchange rate changes on cash	3	(12)
Net increase (decrease) in cash	(58)	50
Cash at beginning of year	721	494
Cash at end of period	663	544
Supplemental disclosure of cash flow information
Income taxes paid	58	15
Interest paid	$ 59	$ 60