Consolidated Statement of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Cash flows from operating activities
Net income	$ 1,052		$ 896
Adjustments to reconcile net income to net cash provided by operating activities:
Net realized investment gains	(1)	[1]	(10)	[1]
Depreciation and amortization	227		219
Deferred federal income tax expense	153		131
Amortization of deferred acquisition costs	950		948
Equity in income from other investments	(139)		(74)
Change in premiums receivable	(189)		(155)
Change in reinsurance recoverables	106		390
Change in deferred acquisition costs	(986)		(954)
Change in claims and claim adjustment expense reserves	(209)		(751)
Change in unearned premium reserves	94		187
Other operating activities	(355)		(297)
Net cash provided by operating activities	703		530
Cash flows from investing activities
Proceeds from maturities of fixed maturities	2,312		2,123
Proceeds from sales of investments, fixed maturities	406		234
Proceeds from sales of investments, equity securities	36		36
Proceeds from sales of investments, real estate investments	1
Proceeds from sales of investments, other investments	167		174
Purchases of investments, fixed maturities	(2,715)		(2,339)
Purchases of investments, equity securities	(18)		(13)
Purchases of investments, real estate investments	(9)		(6)
Purchases of investments, other investments	(113)		(95)
Net (purchases) sales of short-term securities	(160)		109
Securities transactions in course of settlement	240		180
Acquisition, net of cash acquired	(12)
Other investing activities	(60)		(100)
Net cash provided by investing activities	75		303
Cash flows from financing activities
Payment of debt			(500)
Dividends paid to shareholders	(176)		(175)
Issuance of common stock - employee share options	57		98
Treasury stock acquired - share repurchase authorization	(650)		(300)
Treasury stock acquired - net employee share-based compensation	(54)		(58)
Excess tax benefits from share-based payment arrangements	13		21
Net cash used in financing activities	(810)		(914)
Effect of exchange rate changes on cash	(2)		(6)
Net decrease in cash	(34)		(87)
Cash at beginning of year	294		330
Cash at end of period	260		243
Supplemental disclosure of cash flow information
Income taxes paid	93		27
Interest paid	$ 34		$ 35

[1] Total other-than-temporary impairment (OTTI) gains (losses) were $(7) million for the three months ended March 31, 2014 and $0 million for the three months ended March 31, 2013. Of total OTTI, credit losses of $(9) million and $(5) million for the three months ended March 31, 2014 and 2013, respectively, were recognized in net realized investment gains. In addition, unrealized gains from other changes in total OTTI of $2 million and $5 million for the three months ended March 31, 2014 and 2013, 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.