Consolidated Statement of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Cash flows from operating activities
Net income	$ 3,692		$ 3,673		$ 2,473
Adjustments to reconcile net income to net cash provided by operating activities:
Net realized investment gains	(79)	[1]	(166)	[1]	(51)	[1]
Depreciation and amortization	864		867		827
Deferred federal income tax expense	121		167		223
Amortization of deferred acquisition costs	3,882		3,821		3,910
Equity in income from other investments	(486)		(357)		(342)
Premiums receivable	(207)		54		(138)
Reinsurance recoverables	400		1,284		453
Deferred acquisition costs	(3,926)		(3,759)		(3,914)
Claims and claim adjustment expense reserves	(704)		(2,057)		(540)
Unearned premium reserves	73		27		123
Other operating activities	63		262		206
Net cash provided by operating activities	3,693		3,816		3,230
Cash flows from investing activities
Proceeds from maturities of fixed maturities	10,894		7,904		8,369
Proceeds from sales of investments:
Fixed maturities	1,049		1,635		1,087
Equity securities	158		86		37
Real estate investments	15		18		53
Other investments	855		762		835
Purchases of investments:
Fixed maturities	(11,325)		(9,467)		(10,447)
Equity securities	(52)		(57)		(48)
Real estate investments	(48)		(107)		(95)
Other investments	(554)		(446)		(534)
Net sales (purchases) of short-term securities	(498)		111		117
Securities transactions in course of settlement	82		21		(23)
Acquisition, net of cash acquired	(12)		(997)
Other investing activities	(358)		(373)		(323)
Net cash provided by (used in) investing activities	206		(910)		(972)
Cash flows from financing activities
Treasury stock acquired - share repurchase authorization	(3,275)		(2,400)		(1,474)
Treasury stock acquired - net employee share-based compensation	(57)		(61)		(53)
Dividends paid to shareholders	(729)		(729)		(694)
Issuance of common stock - employee share options	195		206		295
Payment of debt			(500)		(258)
Issuance of debt			494
Excess tax benefits from share-based payment arrangements	57		51		38
Net cash used in financing activities	(3,809)		(2,939)		(2,146)
Effect of exchange rate changes on cash	(10)		(3)		4
Net increase (decrease) in cash	80		(36)		116
Cash at beginning of year	294		330		214
Cash at end of year	374		294		330
Supplemental disclosure of cash flow information
Income taxes paid	1,147		1,057		188
Interest paid	$ 365		$ 355		$ 375

[1] Total other-than-temporary impairment (OTTI) gains (losses) were $(22) million, $(10) million and $27 million for the years ended December 31, 2014, 2013 and 2012, respectively. Of total OTTI, credit losses of $(26) million, $(15) million and $(15) million for the years ended December 31, 2014, 2013 and 2012 respectively, were recognized in net realized investment gains. In addition, unrealized gains from other changes in total OTTI of $4 million, $5 million and $42 million for the years ended December 31, 2014, 2013 and 2012, 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.