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Other assets (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Favorable drilling and management services contracts $ 10 $ 33
Taxes receivable 32 38
Prepaid expenses 67 33
Right of use asset 57 35
Reimbursable amounts due from customers 11 21
Deferred contract costs 14 12
Derivative asset - interest rate cap 0 3
Insurance receivable 4 14
Other (5) 37 28
Total other assets 232 217
Related party loans receivable 477 $ 704
Prepaid D&O insurance 17  
Affiliated Entity | Northern Ocean    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Related party loans receivable $ 5