Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash Flows From Operating Activities
Net Income	$ 634	$ 525	$ 517
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	52	51	50
Realized investment gains, net	(70)	(133)	(83)
Share-based compensation	20	19	18
Interest credited to contract holders'	44	47	44
Deferred income tax expense	16	37	19
Changes in:
Investment income receivable	(6)	(2)	(6)
Premiums and reinsurance receivable	(48)	(60)	(64)
Deferred policy acquisition costs	(18)	(20)	(44)
Other assets	(39)	19	(32)
Loss and loss expense reserves	233	174	81
Life policy reserves	101	119	84
Unearned premiums	119	106	184
Other liabilities	44	(11)	77
Current income tax receivable/payable	(18)	2	(49)
Net cash provided by operating activities	1,064	873	796
Cash Flows From Investing Activities
Sale of fixed maturities	43	26	40
Call or maturity of fixed maturities	1,199	1,019	930
Sale of equity securities	342	335	178
Purchase of fixed maturities	(1,722)	(1,312)	(1,381)
Purchase of equity securities	(493)	(392)	(265)
Investment in finance receivables	(14)	(18)	(39)
Collection of finance receivables	30	31	30
Investment in buildings and equipment, net	(10)	(9)	(7)
Change in other invested assets, net	1	9	5
Net cash used in investing activities	(624)	(311)	(509)
Cash Flows From Financing Activities
Payment of cash dividends to shareholders	(366)	(278)	(263)
Shares acquired - share repurchase authorization	(53)	(21)	(52)
Payments of note payable	(14)	(55)	0
Proceeds from stock options exercised	24	22	25
Contract holders' funds deposited	83	86	86
Contract holders' funds withdrawn	(148)	(143)	(128)
Excess tax benefits on share-based compensation	4	2	5
Other	(17)	(17)	(14)
Net cash used in financing activities	(487)	(404)	(341)
Net change in cash and cash equivalents	(47)	158	(54)
Cash and cash equivalents at beginning of year	591	433	487
Cash and cash equivalents at end of year	544	591	433
Supplemental Disclosures of Cash Flow Information
Interest paid	52	53	53
Income taxes paid	245	154	222
Noncash Activities
Conversion of securities	3	7	0
Equipment acquired under capital lease obligations	20	12	28
Cashless exercise of stock options	16	19	28
Other assets and other liabilities	$ 27	$ 0	$ 0