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Taxation (Treatment of Toll Charge Related to the U.S. TCJA) (Details) - United States - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2021	Dec. 31, 2020
Income Tax and Tax Rate [Line Items]
Provisional amount of income tax expense recognized for the Toll Charge	$ 219
Reduction in liability for deferred income tax	$ 4
Recognition of previously unrecognized tax benefit		$ 77
Unrecognized tax benefit recorded		$ 142
Interest in connection with unrecognized tax benefit			$ 5	$ 6

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Income tax and tax rate [Line Items]

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