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Segment information
 6 Months Ended
Jun. 30, 2021
Segment Reporting [Abstract]  
Segment information Segment information
We use the management approach to identify our operating segments. We identified the Board of Directors as the Group’s chief operating decision maker ("CODM") which regularly reviews internal reports when making decisions about allocation of resources to segments and in assessing their performance. In the second half of 2020, we implemented a new operating unit structure which had an increased focus on asset class. The rationale behind this change was to better benchmark our operational performance against so called ‘pure play’ peers who are product line focused, thereby enhancing transparency, efficiency, cost control and leadership focus by asset class. We updated our reportable segments in line with this change.

We now have the following three reportable segments:

1.Harsh environment: Includes contract revenues, management contract revenue, reimbursable revenue and associated expenses for harsh environment semi-submersible and jack-up rigs.
2.Floaters: Includes contract revenues, management contract revenue, reimbursable revenue and associated expenses for benign environment semi-submersible rigs and drillships.
3.Jack-ups: Includes contract revenues, management contract revenue, reimbursable revenue and associated expenses for benign environment jack-up rigs.

We previously included revenues and expenses relating to management services in the "other" reportable segment. We have now allocated revenues relating to management contracts and associated expenses to the three operating segments based on the type of rig being managed. This is in line with how segment performance is now assessed by the CODM based on both owned and managed rigs results.
Segment results are evaluated on the basis of operating income and the information presented below is based on information used for internal management reporting. The change in reportable segments has been reflected retrospectively. Corresponding items of segment information for earlier periods have been recast. The remaining incidental revenues and expenses not included in the reportable segments are included in the "other" reportable segment.

The below section splits out total operating revenue, depreciation, amortization of intangibles, operating net loss, drilling units and capital expenditures by segment:

Total operating revenue
(In $ millions)Six months ended June 30, 2021Six months ended June 30, 2020
Harsh environment232 276 
Floaters154 216 
Jack-up rigs60 98 
Other6 8 
Total452 598 

Depreciation
(In $ millions)Six months ended June 30, 2021Six months ended June 30, 2020
Harsh environment43 52 
Floaters19 105 
Jack-up rigs21 25 
Total83 182 

Loss on impairment of long-lived assets

(In $ millions)Six months ended June 30, 2021Six months ended June 30, 2020
Harsh environment152 160 
Floaters— 1,070 
Jack-ups— — 
Total152 1,230 

Operating loss - Net loss
(In $ millions)Six months ended June 30, 2021Six months ended June 30, 2020
Harsh environment(177)(147)
Floaters(27)(1,184)
Jack-ups(1)10 
Other(47)(51)
Operating loss(252)(1,372)
Unallocated items:
Total financial items and other(342)(374)
Income taxes(11)(2)
Net loss(605)(1,748)
Drilling units - Total assets
(In $ millions)As at June 30, 2021As at December 31,
2020
Harsh environment858 1,032 
Floaters507 528 
Jack-ups562 560 
Total drilling units1,927 2,120 
Unallocated items:
Investments in associated companies248248
Cash and restricted cash644 723 
Other assets838 870 
Total assets3,657 3,961 

Drilling units - Capital expenditures
(In $ millions)Six months ended June 30, 2021Six months ended June 30, 2020
Harsh environment17 11 
Floaters12 58 
Jack-ups10 7 
Other1 9 
Total40 85 

Geographic segment data
Revenues are attributed to geographical segments based on the country of operations for drilling activities, i.e. the country where the revenues are generated. The following information presents our revenues and fixed assets by geographic area:
Revenues
(In $ millions)Six months ended June 30, 2021Six months ended June 30, 2020
Norway234 291 
Brazil54 19 
Angola53 98 
United States46 59 
Saudi Arabia42 62 
Nigeria— 5 
Others (1)
23 64 
Total452 598 
(1)     Other countries represent countries in which we operate that individually had revenues representing less than 10% of total revenues earned for any of the periods presented.
Fixed assets – drilling units (1)
(In $ millions)As at June 30, 2021As at December 31,
2020
Norway858 1,044 
Saudi Arabia230 234 
Brazil161 79 
Qatar150 151 
Malaysia130 185 
United States87 87 
Other (2)
311 340 
Total1,927 2,120 
(1)     The countries in this table represent the location of the drilling unit at the end of the reporting period and are not necessarily indicative of the geographic distribution of the revenues or operating profits generated by the assets during the period. In most cases these locations are different to the country in which the Company that owns the drilling unit is registered.
(2)     "Other" represents countries in which we operate that individually had fixed assets representing less than 5% of total fixed assets for any of the periods presented.

Major Customers
We had the following customers with total revenues greater than 10% in any of the periods presented:
(In $ millions)Six months ended June 30, 2021Six months ended June 30, 2020
ConocoPhillips19 %13 %
Lundin12 %— %
Equinor13 %19 %
Sonagol10 %9 %
Saudi Aramco9 %10 %
Northern Ocean5 %14 %