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Long term debt and interest expense - Annual contractual principal repayments (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Finance leases    
2020 $ 2  
2021 1  
2022 1  
Total minimum lease payments 3  
Debt discount and issuance costs    
2020 (11)  
2021 (12)  
2022 (13)  
2023 (13)  
2024 (5)  
Total (54) $ (41)
Total    
2020 17  
2021 15  
2022 9  
2023 1,009  
2024 1,877  
Thereafter 15  
Total long-term debt 2,942  
Syndicated Credit Facility    
Long-term debt    
2020 20  
2021 20  
2022 20  
2023 20  
2024 1,880  
Total 1,960  
2023 Notes    
Long-term debt    
2023 1,000  
Total 1,000  
Deferred financing    
Long-term debt    
2020 6  
2021 6  
2022 2  
2023 2  
2024 2  
Thereafter 15  
Total $ 33