Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash Flows From Operating Activities
Net Income	$ 201	$ 188
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	14	12
Realized investment gains, net	(160)	(61)
Share-based compensation	8	7
Interest credited to contract holders'	13	13
Deferred income tax expense	35	12
Changes in:
Investment income receivable	11	8
Premiums and reinsurance receivable	(44)	(23)
Deferred policy acquisition costs	(25)	(9)
Other assets	(5)	(12)
Loss and loss expense reserves	92	86
Life policy reserves	25	22
Unearned premiums	70	47
Other liabilities	(139)	(90)
Current income tax receivable/payable	40	65
Net cash provided by operating activities	136	265
Cash Flows From Investing Activities
Sale of fixed maturities	12	14
Call or maturity of fixed maturities	249	368
Sale of equity securities	216	132
Purchase of fixed maturities	(403)	(496)
Purchase of equity securities	(313)	(129)
Investment in finance receivables	(5)	(6)
Collection of finance receivables	6	8
Investment in buildings and equipment, net	(2)	(3)
Change in other invested assets, net	(6)	4
Net cash used in investing activities	(246)	(108)
Cash Flows From Financing Activities
Payment of cash dividends to shareholders	(77)	(74)
Payments for Repurchase of Common Stock	(15)	0
Repayments of Notes Payable	(3)	0
Proceeds from stock options exercised	6	9
Contract holders' funds deposited	23	26
Contract holders' funds withdrawn	(43)	(39)
Excess tax benefits on stock-based compensation	0	2
Other	(15)	(12)
Net cash used in financing activities	(124)	(88)
Net change in cash and cash equivalents	(234)	69
Cash and cash equivalents at beginning of year	777	544
Cash and cash equivalents at end of period	543	613
Supplemental Disclosures of Cash Flow Information:
Income taxes paid (refunded)	0	(1)
Noncash Activities
Conversion of securities	4	3
Equipment acquired under capital lease obligations	3	9
Cashless exercise of stock options	4	5
Other assets and other liabilities	$ 73	$ 0