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Chapter 11 Proceedings - Cash Flow (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Reorganization, Chapter 11 [Line Items]    
Net loss $ (605) $ (1,748)
Depreciation 83 182
Loss on disposals (11) 0
Income (Loss) from Equity Method Investments (2) 66
Loss on impairment of investments 0 47
Deferred tax benefit (1) (2)
Non-cash reorganization items 178 0
Unrealized foreign exchange (gain)/loss (4) 22
Change in allowance for credit losses 60 63
Payments for long-term maintenance (26) (71)
Repayments made under lease arrangements (31) 0
Trade accounts receivable 10 16
Trade accounts payable 15 (16)
Related party receivables (17) (88)
Related party payables 1 (9)
Other assets (8) 5
Other liabilities 74 (39)
Net cash used in operating activities (64) (278)
Additions to drilling units and equipment (13) (14)
Proceeds from disposal of drilling unit 7 0
Net cash used in investing activities (19) (13)
Net cash used in financing activities 0 (24)
Effect of exchange rate changes on cash 4 (22)
Net decrease in cash and cash equivalents, including restricted cash (79) (337)
Cash and cash equivalents, including restricted cash, at beginning of the period 723 1,357
Cash and cash equivalents, including restricted cash, at the end of period 644 $ 1,020
Reorganization, Chapter 11, Debtor-in-Possession    
Reorganization, Chapter 11 [Line Items]    
Net loss (575)  
Depreciation 83  
Loss on disposals (11)  
Income (Loss) from Equity Method Investments (1)  
Loss on impairment of investments 152  
Deferred tax benefit (1)  
Non-cash reorganization items 178  
Unrealized foreign exchange (gain)/loss (4)  
Change in allowance for credit losses 54  
Payments for long-term maintenance (26)  
Repayments made under lease arrangements (12)  
Trade accounts receivable 3  
Trade accounts payable 14  
Related party receivables 0  
Related party payables 28  
Other assets 11  
Other liabilities 45  
Net cash used in operating activities (62)  
Additions to drilling units and equipment (13)  
Proceeds from disposal of drilling unit 7  
Net cash used in investing activities (6)  
Net cash used in financing activities 0  
Effect of exchange rate changes on cash 4  
Net decrease in cash and cash equivalents, including restricted cash (64)  
Cash and cash equivalents, including restricted cash, at beginning of the period 625  
Cash and cash equivalents, including restricted cash, at the end of period $ 561