Taxation (Components Of Net Deferred Tax Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred Tax Assets, Gross [Abstract]
Loss reserve discount	$ 950	$ 884
Unearned premium reserve	544	496
Foreign tax credits	156	222
Provision for uncollectible balances	32	46
Loss carry-forwards	139	123
Debt related amounts	70	69
Compensation related amounts	178	281
Cumulative translation adjustments	28	120
Unrealized depreciation on investments	0	75
Deferred Tax Asset, Lease Liability	111	121
Deferred Tax Assets, Property, Plant and Equipment	190	0
Total deferred tax assets	2,398	2,437
Deferred Tax Liabilities, Gross [Abstract]
Deferred policy acquisition costs	679	522
VOBA and other intangible assets	1,268	1,425
Un-remitted foreign earnings	121	77
Investments	144	0
Unrealized appreciation on investments	360	957
Depreciation	0	123
Leasing Arrangements	100	111
Deferred Tax Liabilities, Other	23	31
Deferred Tax Liabilities, Gross	2,695	3,246
Valuation allowance	92	83
Deferred Tax Liabilities, Net	$ (389)	$ (892)