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Leases - Information related to Right of use assets (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
Disclosure of quantitative information about right-of-use assets [line items]  
Right of use Assets $ 4,372
Additions including remeasurements 855
Depreciation (1,174)
Currency (42)
Other 0
Right of use Assets 4,011
Drilling Rigs [Member]  
Disclosure of quantitative information about right-of-use assets [line items]  
Right of use Assets 1,212
Additions including remeasurements 160
Depreciation (398)
Currency (23)
Other 0
Right of use Assets 951
Vessels [Member]  
Disclosure of quantitative information about right-of-use assets [line items]  
Right of use Assets 1,302
Additions including remeasurements 439
Depreciation (413)
Currency (8)
Other 0
Right of use Assets 1,320
Land and buildings [member]  
Disclosure of quantitative information about right-of-use assets [line items]  
Right of use Assets 1,537
Additions including remeasurements 59
Depreciation (225)
Currency (6)
Other 0
Right of use Assets 1,365
Storage facilities [Member]  
Disclosure of quantitative information about right-of-use assets [line items]  
Right of use Assets 72
Additions including remeasurements 141
Depreciation (57)
Currency 0
Other 0
Right of use Assets 156
Other [Member]  
Disclosure of quantitative information about right-of-use assets [line items]  
Right of use Assets 249
Additions including remeasurements 56
Depreciation (81)
Currency (5)
Other 0
Right of use Assets 219
Assets under development [Member]  
Disclosure of quantitative information about right-of-use assets [line items]  
Depreciation $ (375)