Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 166	$ 377	$ 432
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and other non-cash items	42	41	38
Realized gains on investments, net	(70)	(159)	(336)
Stock-based compensation	13	11	10
Interest credited to contract holders	51	48	43
Deferred income tax (benefit) expense	(17)	30	71
Changes in:
Investment income receivable		(1)	(20)
Premiums and reinsurance receivable	(128)	80	148
Deferred policy acquisition costs	(33)	(23)	(12)
Other assets	2	3	10
Loss and loss expense reserves	139	58	56
Life policy reserves	76	113	110
Unearned premiums	80	44	(35)
Other liabilities	(49)	(18)	5
Current income tax receivable/payable	(25)	(73)	5
Net cash (used in) provided by operating activities	247	531	525
CASH FLOWS FROM INVESTING ACTIVITIES
Sale of fixed maturities	71	199	187
Call or maturity of fixed maturities	808	886	659
Sale of equity securities	539	273	1,247
Purchase of fixed maturities	(1,087)	(1,483)	(2,135)
Purchase of equity securities	(337)	(396)	(796)
Change in short-term investments, net		7	78
Investment in buildings and equipment, net	(7)	(17)	(42)
Investment in finance receivables	(32)	(27)	(34)
Collection of finance receivables	30	29	30
Change in other invested assets, net	7		(9)
Net cash provided by investing activities	(8)	(529)	(815)
CASH FLOWS FROM FINANCING ACTIVITIES
Payment of cash dividends to shareholders	(255)	(252)	(249)
Purchase of treasury shares	(32)	(10)
Increase in notes payable	55
Proceeds from stock options exercised	1
Contract holders' funds deposited	172	170	162
Contract holders' funds withdrawn	(121)	(74)	(66)
Excess tax benefits on share-based compensation	5	2
Other	(11)	(10)	(9)
Net cash used in financing activities	(186)	(174)	(162)
Net change in cash and cash equivalents	53	(172)	(452)
Cash and cash equivalents at beginning of year	385	557	1,009
Cash and cash equivalents at end of period	438	385	557
Supplemental disclosures of cash flow information:
Interest paid	53	53	55
Income taxes paid	51	167	74
Non-cash activities:
Conversion of securities		5	90
Equipment acquired under capital lease obligations	$ 28		$ 15