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Income Taxes (Reconciliation Of The Difference Between The Provision For Income Taxes And The Expected Tax Provision At The Weighted Average Tax Rate) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Taxes [Line Items]
Underwriting gain (loss)	$ 477	$ 224	$ (254)
Net investment income	830	1,165	642
Net realized capital gains (losses)	(455)	258	268
Corporate expenses	(61)	(68)	(41)
Interest, fee and bond issue cost amortization expense	(101)	(70)	(36)
Other income (expense)	(102)	37	6
INCOME (LOSS) BEFORE TAXES	588	1,546	585
Increase (decrease) in taxes resulting from:
Total income tax provision	(9)	167	71
Domestic [Member]
Income Taxes [Line Items]
Underwriting gain (loss)	(81)	(83)	24
Net investment income	607	708	340
Net realized capital gains (losses)	(426)	266	235
Net derivative gain (loss)
Corporate expenses	(26)	(33)	(16)
Interest, fee and bond issue cost amortization expense	(101)	(70)	(36)
Other income (expense)	(6)	23	(15)
INCOME (LOSS) BEFORE TAXES	(32)	811	532
Expected tax provision at the applicable statutory rate(s)	(9)	170	112
Increase (decrease) in taxes resulting from:
Tax exempt income	(4)	(4)	(4)
Dividend received deduction	(3)	(1)	(1)
Proration	1	1	1
Affiliated preferred stock dividends	7	7	7
Creditable foreign premium tax	(11)	(13)	(12)
Tax audit settlement
Share based compensation tax benefits formerly in APIC	(3)	(2)	(3)
Impact of CARES Act			(32)
Valuation allowance
Change in uncertain tax positions
Other	5	3	3
Total income tax provision	(14)	161	71
Non-U.S. [Member]
Income Taxes [Line Items]
Underwriting gain (loss)	558	307	(278)
Net investment income	223	457	303
Net realized capital gains (losses)	(29)	(8)	33
Net derivative gain (loss)		3	2
Corporate expenses	(35)	(34)	(25)
Interest, fee and bond issue cost amortization expense			(1)
Other income (expense)	(96)	11	20
INCOME (LOSS) BEFORE TAXES	620	735	53
Expected tax provision at the applicable statutory rate(s)		14	(10)
Increase (decrease) in taxes resulting from:
Tax exempt income
Dividend received deduction
Proration
Affiliated preferred stock dividends
Creditable foreign premium tax
Tax audit settlement
Share based compensation tax benefits formerly in APIC
Impact of CARES Act
Valuation allowance	5	(10)	15
Change in uncertain tax positions
Other		1	(5)
Total income tax provision	$ 5	$ 5

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