Taxation (Components Of Net Deferred Tax Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Deferred Tax Assets, Gross [Abstract]
Loss reserve discount	$ 1,643	$ 1,048
Unearned premiums reserve	678	424
Foreign tax credits	19	76
Loss carry-forwards	149	104
Investments	0	62
Unrealized depreciation on investments	662	1,387
Depreciation	37	126
Other	147	85
Total deferred tax assets	3,335	3,312
Valuation allowance	716	916
Deferred tax assets, net of valuation allowance	2,619	2,396
Deferred Tax Liabilities, Gross [Abstract]
Deferred policy acquisition costs	675	311
Other intangible assets, including VOBA	1,444	2,213
Un-remitted foreign earnings	176	249
Investments	138	0
Total deferred tax liabilities	2,433	2,773
Net deferred tax assets (liabilities)	$ 186	$ 377