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Taxation (Reconciliation of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Income Tax Contingency [Line Items] |  |
Unrecognized Tax Benefits, beginning of year | $ 13 | $ 17
Additions based on tax provisions related to the current year | 1 | 3
Additions based on tax positions related to prior years | 0 | 0
Reductions for tax positions of prior years | 0 | (4)
Reductions for the lapse of the applicable statutes of limitations | 0 | (3)
Unrecognized Tax Benefits, end of year |  | 13
Unrecognized tax benefits that would affect the effective tax rate | $ 14 | $ 13

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