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Segment information - Results by Segment (Details)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Jul. 01, 2018
USD ($)
Dec. 31, 2020
USD ($)
segment
Dec. 31, 2019
USD ($)
Dec. 31, 2017
USD ($)
Segment Reporting [Abstract]          
Number of reportable segments | segment     3    
Number of operating segments | segment     3    
Segment Reporting Information [Line Items]          
Revenues $ 541 $ 712 $ 1,059 $ 1,388  
Depreciation 236 391 346 426  
Amortization of intangibles 58 0 1 134  
Impairment of drilling units and intangible assets 0 414 4,108 0  
Operating Income - net income [Abstract]          
Operating profit/(loss) (175) (613) (4,482) (295)  
Unallocated items:          
Total financial items and other (422) (3,242) (176) (966)  
Loss before income taxes (597) (3,855) (4,658) (1,261)  
Drilling units     2,120 6,401  
Investment in associated companies     248 389  
Marketable securities     8 11  
Cash and restricted cash 2,003 2,177 723 1,357 $ 1,359
Other assets     862 1,121  
Total assets     3,961 9,279  
Capital expenditures 98 116 148 162  
Other          
Segment Reporting Information [Line Items]          
Revenues 11 5 18 24  
Depreciation 15 20 29 29  
Impairment of drilling units and intangible assets 0 0 48 0  
Operating Income - net income [Abstract]          
Operating profit/(loss) (4) (20) (218) (23)  
Harsh environment          
Segment Reporting Information [Line Items]          
Amortization of intangibles (13) 0 1 0  
Unallocated items:          
Drilling units     1,032 1,537  
Capital expenditures 7 41 26 34  
Harsh environment | Operating Segments          
Segment Reporting Information [Line Items]          
Revenues 150 103 526 510  
Depreciation 78 134 93 125  
Impairment of drilling units and intangible assets 0 414 419 0  
Operating Income - net income [Abstract]          
Operating profit/(loss) (59) (562) (396) (69)  
Floaters          
Segment Reporting Information [Line Items]          
Amortization of intangibles 50 0 0 105  
Unallocated items:          
Drilling units     528 4,184  
Capital expenditures 72 69 110 111  
Floaters | Operating Segments          
Segment Reporting Information [Line Items]          
Revenues 273 476 358 625  
Depreciation 120 179 176 224  
Impairment of drilling units and intangible assets 0 0 3,555 0  
Operating Income - net income [Abstract]          
Operating profit/(loss) (112) 42 (3,781) (201)  
Jack-up rigs          
Segment Reporting Information [Line Items]          
Amortization of intangibles 21 0 0 29  
Unallocated items:          
Drilling units     560 680  
Capital expenditures 19 6 12 17  
Jack-up rigs | Operating Segments          
Segment Reporting Information [Line Items]          
Revenues 107 128 157 229  
Depreciation 23 58 48 48  
Impairment of drilling units and intangible assets 0 0 86 0  
Operating Income - net income [Abstract]          
Operating profit/(loss) $ 0 $ (73) $ (87) $ (2)