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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash Flows from Operating Activities    
Net loss $ (635) $ (101)
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 391 406
Amortization of deferred loan charges   18
Amortization of unfavorable contracts (21) (23)
Share of results from associated companies (149) (91)
Share-based compensation expense 3 4
Loss on disposals   166
Contingent consideration realized (7) (11)
Unrealized loss/(gain) on derivative financial instruments 4 (60)
Loss on impairment of fixed assets 414  
Dividends received from associated companies 17 7
Net movements in tax (9) (18)
Unrealized foreign exchange gain on debt   22
Payments for long-term maintenance (78) (28)
Gain on derecognition of investment in associated company   (10)
Gain on debt extinguishment   (19)
Loss on unrealized marketable securities 3 (6)
Other, net (1) 2
Changes in operating assets and liabilities, net of effect of acquisitions and disposals    
Trade accounts receivable 29 83
Trade accounts payable 4 (4)
Prepaid expenses/accrued revenue 42 (9)
Deferred revenue (23) (71)
Related party receivables (13) 4
Related party payables (42) (28)
Other assets (62) 55
Other liabilities 1 (75)
Net cash (used in) provided by operating activities (132) 219
Cash Flows from Investing Activities    
Additions to newbuildings (1) (22)
Additions to drilling units and equipment (48) (16)
Proceeds from contingent consideration 48 49
Settlement of the West Mira   170
Sale of rigs and equipment 126 76
Payments received from loans granted to related parties 24 58
Buyout of guarantees   (28)
Net cash provided by investing activities 149 287
Cash Flows from Financing Activities    
Repayments of debt (153) (471)
Repayments of debt to related party   (39)
Net cash used in financing activities (153) (510)
Effect of exchange rate changes on cash (5) 2
Net decrease in cash and cash equivalents, including restricted cash (141) (2)
Cash and cash equivalents, including restricted cash, at beginning of the period 1,359 1,443
Cash and cash equivalents, including restricted cash, at the end of period $ 1,218 $ 1,441