Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities
Net income		$ 2,071	$ 2,573
Adjustments to reconcile net income to net cash provided by operating activities:
Net realized investment gains	[1]	(33)	(35)
Depreciation and amortization		624	620
Deferred federal income tax expense		29	105
Amortization of deferred acquisition costs		2,972	2,913
Equity in income from other investments		(114)	(214)
Premiums receivable		(340)	(300)
Reinsurance recoverables		248	247
Deferred acquisition costs		(3,096)	(2,998)
Claims and claim adjustment expense reserves		(139)	(874)
Unearned premium reserves		725	542
Other operating activities		116	95
Net cash provided by operating activities		3,063	2,674
Cash flows from investing activities
Proceeds from maturities of fixed maturities		6,648	8,805
Proceeds from sales of investments:
Fixed maturities		865	1,555
Equity securities		71	38
Real estate investments		69	15
Other investments		569	505
Purchases of investments:
Fixed maturities		(9,004)	(9,972)
Equity securities		(36)	(31)
Real estate investments		(30)	(116)
Other investments		(422)	(389)
Net purchases of short-term securities		(135)	(782)
Securities transactions in course of settlement		511	103
Other investing activities		(240)	(222)
Net cash used in investing activities		(1,134)	(491)
Cash flows from financing activities
Treasury stock acquired - share repurchase authorization		(1,650)	(2,150)
Treasury stock acquired - net employee share-based compensation		(71)	(73)
Dividends paid to shareholders		(569)	(557)
Payment of debt		(400)
Issuance of debt		491	392
Issuance of common stock - employee share options		164	142
Excess tax benefits from share-based payment arrangements			42
Net cash used in financing activities		(2,035)	(2,204)
Effect of exchange rate changes on cash		(5)	(9)
Net decrease in cash		(111)	(30)
Cash at beginning of year		380	374
Cash at end of period		269	344
Supplemental disclosure of cash flow information
Income taxes paid		648	882
Interest paid		$ 223	$ 217

[1] Total other-than-temporary impairment (OTTI) losses were $(4) million and $(14) million for the three months ended September 30, 2016 and 2015, respectively, and $(36) million and $(26) million for the nine months ended September 30, 2016 and 2015, respectively. Of total OTTI, credit losses of $(4) million and $(14) million for the three months ended September 30, 2016 and 2015, respectively, and $(26) million and $(23) million for the nine months ended September 30, 2016 and 2015, respectively, were recognized in net realized investment gains. In addition, unrealized gains (losses) from other changes in total OTTI of $0 million for both of the three months ended September 30, 2016 and 2015, and $(10) million and $(3) million for the nine months ended September 30, 2016 and 2015, respectively, were recognized in other comprehensive income (loss) as part of changes in net unrealized gains on investment securities having credit losses recognized in the consolidated statement of income.