Annual report pursuant to Section 13 and 15(d)

Assets and Liabilities Measured at Fair Value (Details)

v3.10.0.1
Assets and Liabilities Measured at Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Jun. 15, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative, notional amount     $ 125
Non-current assets:      
Interest rate swap arrangements (note 8)   $ 2  
Recurring      
Current assets:      
Interest rate swap arrangements (note 8) $ 5    
Cash equivalents 233 42  
Non-current assets:      
Interest rate swap arrangements (note 8)   7  
Long-term liabilities:      
Debt (note 8) 4,758 5,592  
Recurring | Level 1      
Current assets:      
Cash equivalents 233 42  
Long-term liabilities:      
Debt (note 8) 189    
Recurring | Level 2      
Current assets:      
Interest rate swap arrangements (note 8) 5    
Non-current assets:      
Interest rate swap arrangements (note 8)   7  
Long-term liabilities:      
Debt (note 8) 4,569 5,592  
125 million interest rate swap [Member]      
Current assets:      
Interest rate swap arrangements (note 8) 1    
Non-current assets:      
Interest rate swap arrangements (note 8)   $ 2  
250 million interest rate swap [Member]      
Current assets:      
Interest rate swap arrangements (note 8) $ 4