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Consolidated Statements Of Operations - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Operating revenues    
Operating Revenue $ 712 $ 1,146
Loss on disposals   (166)
Contingent consideration realized 7 11
Operating expenses    
Vessel and rig operating expenses 407 437
Reimbursable expenses 20 16
Depreciation and amortization 391 406
Loss on impairment of long-lived assets 414  
General and administrative expenses 100 149
Total operating expenses 1,332 1,008
Operating loss (613) (17)
Financial items and other income and expense    
Interest income 19 36
Interest expense (38) (195)
Share in results from associated companies (net of tax) 149 91
(Loss)/gain on derivative financial instruments (4) 7
Gain on debt extinguishment   19
Foreign exchange loss   (29)
Unrealized loss on marketable securities (3) 6
Other financial items and other income/(expense), net   (25)
Reorganization items (109)  
Total financial items and other income/(expense), net 14 (96)
Loss before income taxes (599) (113)
Income tax (expense)/benefit (36) 12
Net loss (635) (101)
Net loss attributable to the parent (477) (78)
Net loss attributable to the non-controlling interest (160) $ (23)
Net loss attributable to the redeemable non-controlling interest $ 2  
Basic loss per share (US dollar) $ (0.95) $ (0.16)
Diluted loss per share (US dollar) $ (0.95) $ (0.16)
Contract [Member]    
Operating revenues    
Operating Revenue $ 619 $ 1,040
Reimbursable [member]    
Operating revenues    
Operating Revenue 21 18
Other Member [Member]    
Operating revenues    
Operating Revenue $ 72 $ 88