Taxation (Reconciliation of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, beginning of year	$ 76	$ 47
Additions based on tax provisions related to the current year	0	5
Additions based on tax positions related to prior years	7	24
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	(19)	0
Unrecognized Tax Benefits, end of year	$ 64	$ 76