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Taxation (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Examination [Line Items]      
Valuation allowance $ 78 $ 38  
Unrecognized tax benefits that would affect the effective tax rate 17 16  
Tax-related interest and penalties reported in the consolidated statements of operations 1 $ 1 $ (1)
Liabilities recorded for tax-related interest and penalties 4    
Domestic Tax Authority [Member]      
Income Tax Examination [Line Items]      
Net operating loss carry-forwards $ 356    
Switzerland      
Income Tax Examination [Line Items]      
Applicable income tax rates 7.83%    
Foreign Tax Authority [Member]      
Income Tax Examination [Line Items]      
Foreign tax credit carry-forward $ 114    
Bermuda      
Income Tax Examination [Line Items]      
Applicable income tax rates 0.00%    
UNITED STATES      
Income Tax Examination [Line Items]      
Applicable income tax rates 35.00%    
U.K.      
Income Tax Examination [Line Items]      
Applicable income tax rates 20.00%