Taxation (Reconciliation Of The Difference Between The Provision for Income Taxes and the Expected Tax Provision at Swiss Statutory Income Tax Rate) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Expected tax provision at Swiss statutory rate	$ 1,934	$ 880	$ 411
Taxes on earnings subject to rates other that Swiss statutory rate	(740)	(337)	376
Tax exempt interest and dividends received deduction, net of proration	(38)	(41)	(49)
Net witholding taxes	78	67	40
Other	43	60	17
Provision for income taxes	$ 1,277	$ 629	$ 795