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Related party transactions - Analysis of Related Party Revenues, Operating Expenses, and Financial Items (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Jul. 01, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Related Party Transaction [Line Items] |  |  |  |  |
Total related party operating revenues | $ 56 | $ 38 | $ 286 | $ 332 |
Total related party receivables |  |  | 477 | 704 |
Total related party operating expenses | 3 | 1 | 12 |  | $ 4
Amount due from related parties |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Total related party receivables |  |  | 137 | 55 |
Other Assets |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Total related party receivables |  |  | 5 | 5 |
Management fee revenues |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Total related party operating revenues | 46 | 37 | 135 | 113 |
Reimbursable revenues |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Total related party operating revenues | 9 | 0 | 148 | 218 |
Related party inventory sales |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Total related party operating revenues | 1 | 1 | 1 | 1 |
Other |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Total related party operating revenues | 0 | 0 | 2 | 0 |
Work performed to mobilize drilling rig for first drilling contract |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Total related party receivables |  |  | 142 | 60 |
In country support services expenses |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Total related party operating expenses | 0 | 0 | 0 |  | 1
Interest income | 17 | 12 | 24 | 29 |
Interest income recognized on deferred contingent consideration | 1 | 2 | 2 | 4 |
Total related party financial items | 18 | 14 | 26 | $ 33 |
Related party inventory purchases |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Total related party operating expenses | 1 | 0 | 1 |  | 0
Other related party operating expenses |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Total related party operating expenses | 2 | 1 | 1 |  | 3
West Bollsta lease |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Total related party operating expenses | $ 0 | $ 0 | $ 10 |  | $ 0

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