Current portion before unamortized (discount) premium and debt issuance costs, of long-term debt.

No definition available.

Name:	rig_LongTermDebtGrossCurrent
Namespace Prefix:	rig_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Non current portion before unamortized (discount) premium and debt issuance costs, of long-term debt.

+ References

No definition available.

+ Details

Name:	rig_LongTermDebtGrossNonCurrent
Namespace Prefix:	rig_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of short-term and long-term debt and lease obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

+ Details

Name:	us-gaap_DebtAndCapitalLeaseObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-SubTopic 10
-Topic 210
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-4

+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(a)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of long-term debt and lease obligation, classified as noncurrent.

+ References

+ Details

Name:	us-gaap_LongTermDebtAndCapitalLeaseObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt and lease obligation, classified as current.

+ References

+ Details

Name:	us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtByCurrentAndNoncurrentAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtOtherDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=rig_NotesDue7.45PercentApril2027Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rig_DebenturesDue8PercentApril2027Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rig_ShipyardFinancingArrangementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rig_SeniorSecuredNotesDue8.375PercentFebruary2028Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rig_NotesDue7PercentJune2028Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rig_SeniorSecuredNotesDue8PercentSeptember2028Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rig_SeniorNotes8.25percentDueMay2029Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rig_SeniorGuaranteedExchangeableBonds4.625PercentDueSeptember2029Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rig_SeniorSecuredNotesDue8.75PercentFebruary2030Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rig_NotesDue7.5PercentApril2031Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rig_SeniorNotes8.50PercentDueMay2031Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rig_SeniorGuaranteedNotes7.875PercentDueOctober2032Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rig_SeniorNotesDue6.80PercentMarch2038Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rig_SeniorNotesDue7.35PercentDecember2041Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt (Details) - USD ($) $ in Millions	Mar. 31, 2026	Mar. 30, 2026	Dec. 31, 2025
Principal amount
Total principal amount of debt	$ 5,137		$ 5,686
Debt due within one year	338		458
Long-term debt	4,799		5,228
Carrying amount
Total debt	5,274		5,657
Debt due within one year	329		445
Long-term debt	4,945		5,212
7.45% Notes due April 2027
Principal amount
Total principal amount of debt	52		52
Carrying amount
Total debt	$ 52		52
Debt instrument interest rate stated percentage	7.45%
8.00% Debentures due April 2027
Principal amount
Total principal amount of debt	$ 22		22
Carrying amount
Total debt	$ 22		22
Debt instrument interest rate stated percentage	8.00%
4.50% Shipyard Loans due September 2027
Principal amount
Total principal amount of debt	$ 179		209
Debt due within one year	151		136
Carrying amount
Total debt	173		202
Debt due within one year	$ 146		129
Debt instrument interest rate stated percentage	4.50%
8.375% Senior Secured Notes due February 2028
Principal amount
Total principal amount of debt			425
Debt due within one year			135
Carrying amount
Total debt			421
Debt due within one year			133
Debt instrument interest rate stated percentage	8.375%
7.00% Notes due June 2028
Principal amount
Total principal amount of debt	$ 209		209
Carrying amount
Total debt	$ 210		210
Debt instrument interest rate stated percentage	7.00%
8.00% Senior Secured Notes due September 2028
Principal amount
Total principal amount of debt	$ 200		235
Debt due within one year	70		70
Carrying amount
Total debt	198		233
Debt due within one year	$ 69		69
Debt instrument interest rate stated percentage	8.00%
8.25% Senior Notes due May 2029
Principal amount
Total principal amount of debt	$ 900		900
Carrying amount
Total debt	$ 890		889
Debt instrument interest rate stated percentage	8.25%
4.625% Senior Guaranteed Exchangeable Bonds due September 2029
Principal amount
Total principal amount of debt	$ 259		259
Carrying amount
Total debt	$ 450		292
Debt instrument interest rate stated percentage	4.625%	4.625%
8.75% Senior Secured Notes due February 2030
Principal amount
Total principal amount of debt	$ 822		881
Debt due within one year	117		117
Carrying amount
Total debt	810		868
Debt due within one year	$ 114		114
Debt instrument interest rate stated percentage	8.75%
7.50% Notes due April 2031
Principal amount
Total principal amount of debt	$ 396		396
Carrying amount
Total debt	$ 395		395
Debt instrument interest rate stated percentage	7.50%
8.50% Senior Notes due May 2031
Principal amount
Total principal amount of debt	$ 900		900
Carrying amount
Total debt	$ 888		888
Debt instrument interest rate stated percentage	8.50%
7.875% Senior Guaranteed Notes due October 2032
Principal amount
Total principal amount of debt	$ 500		500
Carrying amount
Total debt	$ 493		493
Debt instrument interest rate stated percentage	7.875%
6.80% Senior Notes due March 2038
Principal amount
Total principal amount of debt	$ 610		610
Carrying amount
Total debt	$ 606		605
Debt instrument interest rate stated percentage	6.80%
7.35% Senior Notes due December 2041
Principal amount
Total principal amount of debt	$ 88		88
Carrying amount
Total debt	$ 87		$ 87
Debt instrument interest rate stated percentage	7.35%