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Taxation (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 22, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Examination [Line Items]        
Income tax benefit related to 2017 Tax Act   $ (450) $ 0 $ 0
Unrecognized Tax Benefits   13 17 $ 16
Valuation allowance   99 78  
Unrecognized tax benefits that would affect the effective tax rate     17  
Tax-related interest and penalties reported in the consolidated statements of operations   1    
Liabilities recorded for tax-related interest and penalties   3 $ 4  
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount   450    
Impact on deferred tax liability [Member]        
Income Tax Examination [Line Items]        
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount   743    
Impact on Deferred Tax Asset [Member]        
Income Tax Examination [Line Items]        
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount   (371)    
Other impact [Member]        
Income Tax Examination [Line Items]        
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount   $ 78    
Tax Year 2017 [Member]        
Income Tax Examination [Line Items]        
Applicable income tax rates   35.00%    
Tax Year 2018 [Member]        
Income Tax Examination [Line Items]        
Applicable income tax rates 21.00% 21.00%    
Domestic Tax Authority [Member]        
Income Tax Examination [Line Items]        
Net operating loss carry-forwards   $ 329    
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   $ 340    
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   19.00%