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Taxation (Reconciliation of Unrecognized Tax Benefits) (Details) - USD ($)
$ in Millions
12 Months Ended
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