Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities
Net income		$ 691	$ 833
Adjustments to reconcile net income to net cash provided by operating activities:
Net realized investment (gains) losses	[1]	9	(10)
Depreciation and amortization		213	225
Deferred federal income tax expense		105	133
Amortization of deferred acquisition costs		971	963
Equity in income from other investments		(17)	(43)
Premiums receivable		(393)	(258)
Reinsurance recoverables		126	69
Deferred acquisition costs		(1,014)	(987)
Claims and claim adjustment expense reserves		226	(561)
Unearned premium reserves		328	185
Other operating activities		(395)	(350)
Net cash provided by operating activities		850	199
Cash flows from investing activities
Proceeds from maturities of fixed maturities		1,748	2,830
Proceeds from sales of investments:
Fixed maturities		421	906
Equity securities		14	11
Real estate investments		69	7
Other investments		186	146
Purchases of investments:
Fixed maturities		(2,700)	(3,325)
Equity securities		(12)	(8)
Real estate investments		(7)	(6)
Other investments		(162)	(168)
Net sales (purchases) of short-term securities		85	(134)
Securities transactions in course of settlement		291	305
Other investing activities		(79)	(90)
Net cash provided by (used in) investing activities		(146)	474
Cash flows from financing activities
Treasury stock acquired - share repurchase authorization		(550)	(600)
Treasury stock acquired - net employee share-based compensation		(59)	(71)
Dividends paid to shareholders		(180)	(177)
Issuance of common stock - employee share options		64	90
Excess tax benefits from share-based payment arrangements			27
Net cash used in financing activities		(725)	(731)
Effect of exchange rate changes on cash		2	(8)
Net decrease in cash		(19)	(66)
Cash at beginning of year		380	374
Cash at end of period		361	308
Supplemental disclosure of cash flow information
Income taxes paid		63	126
Interest paid		$ 42	$ 34

[1] Total other-than-temporary impairment (OTTI) losses were $(28) million and $(4) million for the three months ended March 31, 2016 and 2015, respectively. Of total OTTI, credit losses of $(18) million and $(3) million for the three months ended March 31, 2016 and 2015, respectively, were recognized in net realized investment gains (losses). In addition, unrealized losses from other changes in total OTTI of $(10) million and $(1) million for the three months ended March 31, 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.