Consolidated Statement of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012
Cash flows from operating activities
Net income	$ 2,685		$ 2,169
Adjustments to reconcile net income to net cash provided by operating activities:
Net realized investment gains	(155)	[1]	(12)	[1]
Depreciation and amortization	642		618
Deferred federal income tax expense	132		221
Amortization of deferred acquisition costs	2,851		2,933
Equity in income from other investments	(247)		(271)
Change in premiums receivable	(242)		(307)
Change in reinsurance recoverables	1,102		926
Change in deferred acquisition costs	(2,862)		(3,005)
Change in claims and claim adjustment expense reserves	(1,684)		(1,196)
Change in unearned premium reserves	483		506
Other operating activities	184		184
Net cash provided by operating activities	2,889		2,766
Cash flows from investing activities
Proceeds from maturities of fixed maturities	5,917		5,855
Proceeds from sales of investments, fixed maturities	1,160		724
Proceeds from sales of investments, equity securities	57		31
Proceeds from sales of investments, real estate investments			3
Proceeds from sales of investments, other investments	545		516
Purchases of investments, fixed maturities	(6,492)		(7,677)
Purchases of investments, equity securities	(50)		(39)
Purchases of investments, real estate investments	(65)		(62)
Purchases of investments, other investments	(312)		(292)
Net purchases of short-term securities	(1,893)		(41)
Securities transactions in course of settlement	280		53
Other investing activities	(254)		(229)
Net cash used in investing activities	(1,107)		(1,158)
Cash flows from financing activities
Payment of debt	(500)		(258)
Issuance of debt	494
Dividends paid to shareholders	(549)		(519)
Issuance of common stock - employee share options	158		247
Treasury stock acquired - share repurchase authorization	(1,400)		(1,056)
Treasury stock acquired - net employee share-based compensation	(60)		(52)
Excess tax benefits from share-based payment arrangements	43		32
Net cash used in financing activities	(1,814)		(1,606)
Effect of exchange rate changes on cash	(3)		4
Net increase (decrease) in cash	(35)		6
Cash at beginning of year	330		214
Cash at end of period	295		220
Supplemental disclosure of cash flow information
Income taxes paid	724		310
Interest paid	$ 206		$ 226

[1] Total other-than-temporary impairment (OTTI) gains (losses) were $0 million and $17 million for the three months ended September 30, 2013 and 2012, respectively, and $(1) million and $28 million for the nine months ended September 30, 2013 and 2012, respectively. Of total OTTI, credit losses of $(3) million for each of the three months ended September 30, 2013 and 2012, and $(10) million and $(11) million for the nine months ended September 30, 2013 and 2012, respectively, were recognized in net realized investment gains (losses). In addition, unrealized gains from other changes in total OTTI of $3 million and $20 million for the three months ended September 30, 2013 and 2012, respectively, and $9 million and $39 million for the nine months ended September 30, 2013 and 2012, respectively, were recognized in other comprehensive income (loss) as part of change in net unrealized gains on investment securities having credit losses recognized in the consolidated statement of income.