Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flows From Operating Activities
Net Income	$ 1,997	$ 287	$ 1,045
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	72	63	55
Investment gains and losses, net	(1,640)	408	(148)
Share-based compensation	30	28	26
Interest credited to contract holders'	44	47	48
Deferred income tax expense	343	(47)	(444)
Changes in:
Investment income receivable	(1)	2	0
Premiums and reinsurance receivable	(174)	(109)	77
Deferred policy acquisition costs	(61)	(48)	(36)
Other assets	(22)	(1)	(43)
Loss and loss expense reserves	163	434	188
Life policy and investment contract reserves	107	96	96
Unearned premiums	184	112	97
Other liabilities	74	0	24
Current income tax receivable/payable	92	(91)	67
Net cash provided by operating activities	1,208	1,181	1,052
Cash Flows From Investing Activities
Sale of fixed maturities	102	36	23
Call or maturity of fixed maturities	1,241	1,127	1,172
Sale of equity securities	203	403	523
Purchase of fixed maturities	(1,742)	(1,510)	(1,723)
Purchase of equity securities	(382)	(441)	(513)
Investment in finance receivables	(34)	(33)	(32)
Collection of finance receivables	29	25	23
Investment in buildings and equipment	(24)	(20)	(16)
Change in other invested assets, net	(72)	(38)	(15)
Net cash used in investing activities	(679)	(451)	(558)
Cash Flows From Financing Activities
Payment of cash dividends to shareholders	(355)	(336)	(400)
Shares acquired - share repurchase authorization	(67)	(125)	(92)
Changes in note payable	7	8	4
Proceeds from stock options exercised	11	9	13
Contract holders' funds deposited	86	84	79
Contract holders' funds withdrawn	(174)	(183)	(164)
Other	(54)	(60)	(54)
Net cash used in financing activities	(546)	(603)	(614)
Net change in cash and cash equivalents	(17)	127	(120)
Cash and cash equivalents at beginning of year	784	657	777
Cash and cash equivalents at end of year	767	784	657
Supplemental Disclosures of Cash Flow Information
Interest paid	53	53	52
Income taxes paid	34	98	60
Noncash Activities
Conversion of securities	0	0	5
Equipment acquired under finance lease obligations	14	21	14
Cashless exercise of stock options	9	5	7
Other assets and other liabilities	$ 29	$ 48	$ 75