Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities
Net income	$ 1,667	$ 560
Adjustments to reconcile net income to net cash provided by operating activities:
Net realized investment (gains) losses	(105)	85
Depreciation and amortization	450	391
Deferred federal income tax expense (benefit)	57	(71)
Amortization of deferred acquisition costs	2,461	2,351
Equity in (income) loss from other investments	(513)	186
Premiums receivable	(718)	(571)
Reinsurance recoverables	154	60
Deferred acquisition costs	(2,601)	(2,453)
Claims and claim adjustment expense reserves	1,313	1,455
Unearned premium reserves	968	643
Other operating activities	(94)	(344)
Net cash provided by operating activities	3,039	2,292
Cash flows from investing activities
Proceeds from maturities of fixed maturities	4,347	3,071
Proceeds from sales of investments:
Fixed maturities	2,482	1,220
Equity securities	45	54
Other investments	195	139
Purchases of investments:
Fixed maturities	(9,462)	(4,790)
Equity securities	(41)	(59)
Real estate investments	(14)	(24)
Other investments	(221)	(228)
Net purchases of short-term securities	(194)	(1,147)
Securities transactions in course of settlement	229	94
Acquisition, net of cash acquired	(38)	0
Other investing activities	(113)	(144)
Net cash used in investing activities	(2,785)	(1,814)
Cash flows from financing activities
Treasury stock acquired — share repurchase authorizations	(756)	(425)
Treasury stock acquired — net employee share-based compensation	(42)	(46)
Dividends paid to shareholders	(436)	(426)
Issuance of debt	739	490
Issuance of common stock — employee share options	206	65
Net cash used in financing activities	(289)	(342)
Effect of exchange rate changes on cash	3	(7)
Net increase (decrease) in cash	(32)	129
Cash at beginning of year	721	494
Cash at end of period	689	623
Supplemental disclosure of cash flow information
Income taxes paid	342	17
Interest paid	$ 163	$ 166