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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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