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Long term debt and interest expense, net - Annual contractual principal repayments (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Finance leases    
2021 $ 1  
2021 2  
2022 1  
2023 1  
Total minimum lease payments 3  
Debt discount and issuance costs    
2021 (12)  
2022 (13)  
2023 (14)  
2024 (7)  
2025 (3)  
Thereafter (8)  
Total (57) $ (54)
Total    
2021 (4)  
2022 5  
2023 858  
2024 1,409  
2025 (1)  
Thereafter 155  
Total long-term debt 2,422  
Syndicated Credit Facility    
Long-term debt    
2022 10  
2023 20  
2024 1,414  
Total 1,444  
2023 Notes    
Long-term debt    
2023 850  
Total 850  
2027 Notes    
Long-term debt    
Thereafter 150  
Total 150  
Deferred financing    
Long-term debt    
2021 6  
2022 7  
2023 2  
2024 2  
2025 2  
Thereafter 13  
Total $ 32