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Other revenues (Details) - Other revenues - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2018
Jul. 01, 2018
Dec. 31, 2020
Dec. 31, 2019
Variable Interest Entity [Line Items]        
Leasing revenues $ 0 $ 0 $ 19 $ 1
Amortization of unfavorable contracts 0 21 0 0
Early termination fees 0 13 11 11
Total other revenues [1] $ 0 $ 34 $ 30 $ 12
[1] Includes transactions with related parties. Refer to Note 32 - "Related party transactions" for further details.