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Taxation (Reconciliation of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Income Tax Contingency [Line Items] |  |
Unrecognized Tax Benefits, beginning of year | $ 47 | $ 14
Additions based on tax provisions related to the current year | 5 | 12
Additions based on tax positions related to prior years | 24 | 23
Reductions for the lapse of the applicable statutes of limitations | 0 | (2)
Unrecognized Tax Benefits, end of year | $ 76 | $ 47

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