Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities
Net income		$ 1,902	$ 1,505
Adjustments to reconcile net income to net cash provided by operating activities:
Net realized investment gains	[1]	(54)	(146)
Depreciation and amortization		609	611
Deferred federal income tax expense (benefit)		(43)	88
Amortization of deferred acquisition costs		3,259	3,094
Equity in income from other investments		(284)	(300)
Premiums receivable		(508)	(517)
Reinsurance recoverables		(21)	(19)
Deferred acquisition costs		(3,425)	(3,237)
Claims and claim adjustment expense reserves		880	1,561
Unearned premium reserves		1,095	852
Other operating activities		22	(7)
Net cash provided by operating activities		3,432	3,485
Cash flows from investing activities
Proceeds from maturities of fixed maturities		5,655	6,581
Proceeds from sales of investments:
Fixed maturities		3,185	860
Equity securities		127
Equity securities			340
Real estate investments		8	23
Other investments		270	341
Purchases of investments:
Fixed maturities		(10,862)	(8,403)
Equity securities		(86)
Equity securities			(193)
Real estate investments		(57)	(40)
Other investments		(392)	(392)
Net (purchases) sales of short-term securities		456	(990)
Securities transactions in course of settlement		173	122
Acquisition, net of cash acquired		(4)	(439)
Other investing activities		(232)	(186)
Net cash used in investing activities		(1,759)	(2,376)
Cash flows from financing activities
Treasury stock acquired — share repurchase authorization		(1,100)	(1,028)
Treasury stock acquired — net employee share-based compensation		(51)	(61)
Dividends paid to shareholders		(611)	(589)
Payment of debt		(600)	(207)
Issuance of debt		591	689
Issuance of common stock — employee share options		117	148
Net cash used in financing activities		(1,654)	(1,048)
Effect of exchange rate changes on cash		(4)	11
Net increase in cash		15	72
Cash at beginning of year		344	307
Cash at end of period		359	379
Supplemental disclosure of cash flow information
Income taxes paid		244	467
Interest paid		$ 225	$ 217

[1] Total other-than-temporary impairment (OTTI) losses were $0 million and $(5) million for the three months ended September 30, 2018 and 2017, respectively, and $(1) million and $(11) million for the nine months ended September 30, 2018 and 2017, respectively. Of total OTTI, credit losses of $0 million and $(5) million for the three months ended September 30, 2018 and 2017, respectively, and $(1) million and $(12) million for the nine months ended September 30, 2018 and 2017, respectively, were recognized in net realized investment gains. In addition, unrealized gains (losses) from other changes in total OTTI of $0 million for each of the three months ended September 30, 2018 and 2017, respectively, and $0 million and $1 million for the nine months ended September 30, 2018 and 2017, 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.