Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities
Net income		$ 1,355	$ 1,645
Adjustments to reconcile net income to net cash provided by operating activities:
Net realized investment gains	[1]	(10)	(20)
Depreciation and amortization		413	429
Deferred federal income tax expense		75	142
Amortization of deferred acquisition costs		1,960	1,926
Equity in income from other investments		(44)	(134)
Premiums receivable		(567)	(486)
Reinsurance recoverables		316	263
Deferred acquisition costs		(2,062)	(1,991)
Claims and claim adjustment expense reserves		(387)	(826)
Unearned premium reserves		531	362
Other operating activities		(287)	(435)
Net cash provided by operating activities		1,293	875
Cash flows from investing activities
Proceeds from maturities of fixed maturities		3,773	5,314
Proceeds from sales of investments:
Fixed maturities		739	1,226
Equity securities		38	28
Real estate investments		69	10
Other investments		343	354
Purchases of investments:
Fixed maturities		(5,705)	(6,239)
Equity securities		(26)	(22)
Real estate investments		(20)	(69)
Other investments		(290)	(275)
Net sales of short-term securities		681	433
Securities transactions in course of settlement		461	183
Other investing activities		(154)	(178)
Net cash provided by (used in) investing activities		(91)	765
Cash flows from financing activities
Treasury stock acquired - share repurchase authorization		(1,100)	(1,400)
Treasury stock acquired - net employee share-based compensation		(59)	(72)
Dividends paid to shareholders		(375)	(369)
Payment of debt		(400)
Issuance of debt		491
Issuance of common stock - employee share options		129	117
Excess tax benefits from share-based payment arrangements			31
Net cash used in financing activities		(1,314)	(1,693)
Effect of exchange rate changes on cash		(3)	(4)
Net decrease in cash		(115)	(57)
Cash at beginning of year		380	374
Cash at end of period		265	317
Supplemental disclosure of cash flow information
Income taxes paid		467	597
Interest paid		$ 180	$ 183

[1] Total other-than-temporary impairment (OTTI) losses were $(4) million and $(8) million for the three months ended June 30, 2016 and 2015, respectively, and $(32) million and $(12) million for the six months ended June 30, 2016 and 2015, respectively. Of total OTTI, credit losses of $(4) million and $(6) million for the three months ended June 30, 2016 and 2015, respectively, and $(22) million and $(9) million for the six months ended June 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 and $(2) million for the three months ended June 30, 2016 and 2015, respectively, and $(10) million and $(3) million for the six months ended June 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.