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Restricted cash (Details)
R$ in Millions, $ in Millions
 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2021
BRL (R$)
Dec. 31, 2020
USD ($)
Restricted Cash and Cash Equivalents Items [Line Items]      
Total restricted cash $ 216   $ 197
Deposits received 5    
Restricted Cash [Abstract]      
Current restricted cash 147   132
Non-current restricted cash 69   65
Total restricted cash 216   197
PT Duta Marina      
Restricted Cash and Cash Equivalents Items [Line Items]      
Fair value of consideration received 7    
BTG Pactual      
Restricted Cash and Cash Equivalents Items [Line Items]      
Appeal, collateral placed | R$   R$ 330  
Demand deposit pledged as collateral for tax related guarantee      
Restricted Cash and Cash Equivalents Items [Line Items]      
Total restricted cash 69   65
Accounts pledged as collateral for senior secured notes      
Restricted Cash and Cash Equivalents Items [Line Items]      
Total restricted cash 46   30
Accounts pledged as collateral for performance bonds and similar guarantees      
Restricted Cash and Cash Equivalents Items [Line Items]      
Total restricted cash 31   48
Amounts pledged as collateral for leases      
Restricted Cash and Cash Equivalents Items [Line Items]      
Total restricted cash 22   22
Proceeds from rig disposals      
Restricted Cash and Cash Equivalents Items [Line Items]      
Total restricted cash 12   0
Other      
Restricted Cash and Cash Equivalents Items [Line Items]      
Total restricted cash $ 36   $ 32