Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flows From Operating Activities
Net Income	$ 1,216	$ 1,997	$ 287
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	81	72	63
Investment gains and losses, net	(851)	(1,640)	408
Share-based compensation	31	30	28
Interest credited to contract holders	43	44	47
Deferred income tax expense	136	343	(47)
Changes in:
Investment income receivable	(3)	(1)	2
Premiums and reinsurance receivable	(23)	(174)	(109)
Deferred policy acquisition costs	(39)	(61)	(48)
Other assets	(26)	(22)	(1)
Loss and loss expense reserves	599	163	434
Life policy and investment contract reserves	116	107	96
Unearned premiums	172	184	112
Other liabilities	(5)	74	0
Current income tax receivable/payable	44	92	(91)
Net cash provided by operating activities	1,491	1,208	1,181
Cash Flows From Investing Activities
Sale of fixed maturities	179	102	36
Call or maturity of fixed maturities	912	1,241	1,127
Sale of equity securities	515	203	403
Purchase of fixed maturities	(1,382)	(1,742)	(1,510)
Purchase of equity securities	(699)	(382)	(441)
Investment in finance receivables	(50)	(34)	(33)
Collection of finance receivables	35	29	25
Investment in buildings and equipment	(20)	(24)	(20)
Change in other invested assets, net	(50)	(72)	(38)
Net cash used in investing activities	(560)	(679)	(451)
Cash Flows From Financing Activities
Payment of cash dividends to shareholders	(375)	(355)	(336)
Shares acquired - share repurchase authorization	(261)	(67)	(125)
Changes in note payable	15	7	8
Proceeds from stock options exercised		11	9
Contract holders' funds deposited	85	86	84
Contract holders' funds withdrawn	(159)	(174)	(183)
Other	(110)	(54)	(60)
Net cash used in financing activities	(798)	(546)	(603)
Net change in cash and cash equivalents	133	(17)	127
Cash and cash equivalents at beginning of year	767	784	657
Cash and cash equivalents at end of year	900	767	784
Supplemental Disclosures of Cash Flow Information
Interest paid	53	53	53
Income taxes paid	84	34	98
Noncash Activities
Equipment acquired under finance lease obligations	19	14	21
Share-based compensation	19	9	5
Other assets and other liabilities	$ 57	$ 29	$ 48