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Investment in associated companies - Consolidated Balance Sheets (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2018
Jul. 01, 2018
Dec. 31, 2020
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]        
Current assets     $ 1,062 $ 1,773
Non-current assets     2,899 7,506
Current liabilities     (6,545) (770)
Non-current liabilities     (556) (6,659)
Book value of investment     248 389
Total impairment of investments in associated companies and joint ventures $ 0 $ 0 47 302
Cash proceeds from repayment of shareholder loans held in escrow     2 9
Seadrill Partners        
Schedule of Equity Method Investments [Line Items]        
Seadrill share of book equity       1,305
Total impairment of investments in associated companies and joint ventures     47 302
Seadrill Partners | Basis difference allocated to rigs        
Schedule of Equity Method Investments [Line Items]        
Basis difference       (1,220)
Seadrill Partners | Basis difference allocated to contracts        
Schedule of Equity Method Investments [Line Items]        
Basis difference       37
Seadrill Partners | Seadrill Partners - Direct ownership investments        
Schedule of Equity Method Investments [Line Items]        
Book value of investment     0 122
Sebras Sapura and Seabras Sapura Holding        
Schedule of Equity Method Investments [Line Items]        
Book value of investment     224 221
Seabras Sapura        
Schedule of Equity Method Investments [Line Items]        
Seadrill share of book equity     361 338
Basis difference     (137) (117)
Book value of investment     103 98
Seabras Sapura | Basis difference allocated to rigs        
Schedule of Equity Method Investments [Line Items]        
Basis difference     (351) (369)
Seabras Sapura | Basis difference allocated to contracts        
Schedule of Equity Method Investments [Line Items]        
Basis difference     93 129
Seabras Sapura Holding        
Schedule of Equity Method Investments [Line Items]        
Shareholder loans held as equity     121 123
Book value of investment     121 123
SeaMex        
Schedule of Equity Method Investments [Line Items]        
Seadrill share of book equity     230 236
Basis difference     (230) (214)
Book value of investment     0 22
SeaMex | Basis difference allocated to rigs        
Schedule of Equity Method Investments [Line Items]        
Basis difference     (325) (341)
SeaMex | Basis difference allocated to contracts        
Schedule of Equity Method Investments [Line Items]        
Basis difference     95 127
Sonadrill        
Schedule of Equity Method Investments [Line Items]        
Seadrill share of book equity     22 24
Book value of investment     22 24
Gulfdrill        
Schedule of Equity Method Investments [Line Items]        
Seadrill share of book equity     2 0
Book value of investment     2 0
Seadrill Partners        
Schedule of Equity Method Investments [Line Items]        
Current assets       833
Non-current assets       4,847
Current liabilities       (533)
Non-current liabilities       (2,623)
Net Assets (2)       2,524
Seabras Sapura        
Schedule of Equity Method Investments [Line Items]        
Current assets     207 195
Non-current assets     1,474 1,495
Current liabilities     (541) (510)
Non-current liabilities     (419) (504)
Net Assets (2)     721 676
SeaMex        
Schedule of Equity Method Investments [Line Items]        
Current assets     291 260
Non-current assets     898 939
Current liabilities     (174) (141)
Non-current liabilities     (555) (586)
Net Assets (2)     460 472
Sonadrill        
Schedule of Equity Method Investments [Line Items]        
Current assets     54 57
Non-current assets     0 0
Current liabilities     (11) (9)
Non-current liabilities     0 0
Net Assets (2)     43 48
Gulfdrill        
Schedule of Equity Method Investments [Line Items]        
Current assets     67 0
Non-current assets     102 0
Current liabilities     (135) 0
Non-current liabilities     (31) 0
Net Assets (2)     $ 3 $ 0