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Segment Reporting (Schedule Of Underwriting Results For Operating Segments) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Gross written premium	$ 13,952	$ 13,050	$ 10,482
Net written premiums	12,344	11,446	9,117
Premiums earned	11,787	10,406	8,682
Incurred losses and LAE	8,100	7,391	6,551
Commission and brokerage	2,528	2,209	1,873
Other underwriting expenses	682	583	511
Underwriting gain (loss)	477	224	(254)
Net investment income	830	1,165	642
Net realized gains (losses)	38	50	(11)
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
Reinsurance [Member]
Segment Reporting Information [Line Items]
Gross written premium	9,316	9,067	7,282
Net written premiums	8,983	8,536	6,768
Premiums earned	8,663	7,757	6,466
Incurred losses and LAE	5,997	5,556	4,933
Commission and brokerage	2,134	1,854	1,552
Other underwriting expenses	218	199	176
Underwriting gain (loss)	313	147	(195)
Insurance [Member]
Segment Reporting Information [Line Items]
Gross written premium	4,636	3,982	3,201
Net written premiums	3,361	2,910	2,349
Premiums earned	3,124	2,649	2,215
Incurred losses and LAE	2,103	1,835	1,617
Commission and brokerage	394	354	321
Other underwriting expenses	463	383	336
Underwriting gain (loss)	$ 164	$ 76	$ (58)

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