Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities
Net income		$ 796	$ 669
Adjustments to reconcile net income to net cash provided by operating activities:
Net realized investment (gains) losses	[1]	(53)	11
Depreciation and amortization		211	212
Deferred federal income tax expense (benefit)		32	(56)
Amortization of deferred acquisition costs		1,117	1,061
Equity in income from other investments		(34)	(95)
Premiums receivable		(434)	(397)
Reinsurance recoverables		98	5
Deferred acquisition costs		(1,185)	(1,124)
Claims and claim adjustment expense reserves		(2)	180
Unearned premium reserves		551	518
Other operating activities		(458)	(430)
Net cash provided by operating activities		639	554
Cash flows from investing activities
Proceeds from maturities of fixed maturities		1,556	1,950
Proceeds from sales of investments:
Fixed maturities		769	1,085
Equity securities		39	26
Other investments		105	114
Purchases of investments:
Fixed maturities		(2,914)	(3,920)
Equity securities		(22)	(20)
Real estate investments		(77)	(33)
Other investments		(146)	(142)
Net sales (purchases) of short-term securities		(109)	410
Securities transactions in course of settlement		295	202
Other investing activities		(82)	(53)
Net cash used in investing activities		(586)	(381)
Cash flows from financing activities
Treasury stock acquired — share repurchase authorization		(375)	(350)
Treasury stock acquired — net employee share-based compensation		(46)	(51)
Dividends paid to shareholders		(205)	(197)
Payment of debt			(100)
Issuance of debt		492	491
Issuance of common stock — employee share options		63	85
Net cash used in financing activities		(71)	(122)
Effect of exchange rate changes on cash		2	2
Net increase (decrease) in cash		(16)	53
Cash at beginning of year		373	344
Cash at end of period		357	397
Supplemental disclosure of cash flow information
Income taxes paid		5	56
Interest paid		$ 50	$ 39

[1] Total other-than-temporary impairment (OTTI) gains (losses) were $(1) million and $0 for the three months ended March 31, 2019 and 2018, respectively. Of total OTTI, credit losses of $(1) million and $0 for the three months ended March 31, 2019 and 2018, respectively, were recognized in net realized investment gains (losses). In addition, unrealized gains (losses) from other changes in total OTTI of $0 for each of the three months ended March 31, 2019 and 2018, respectively, were recognized in other comprehensive income (loss) as part of changes in net unrealized gains (losses) on investment securities having credit losses recognized in the consolidated statement of income.