Fresh-Start Adjustment, Increase (Decrease), Due from Related Parties

No definition available.

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Namespace Prefix:	sdrl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10(3))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.3)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(k)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(11))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3)(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

Name:	us-gaap_DueFromRelatedPartiesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due after one year (or one business cycle).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.11)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The increase (decrease) during the reporting period in receivables to be collected from other entities that could exert significant influence over the reporting entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Identify the stated interest rate per the agreement, for example, leasing and debt arrangements between related parties.

+ References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Related party transactions - Analysis of Related Party Receivable Balances (Details) - USD ($)	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Jul. 02, 2018	Nov. 30, 2016	Mar. 31, 2015
Related Party Transaction [Line Items]
Total related party receivables	$ 686,000,000	$ 716,000,000
Amounts due from related parties	141,000,000	177,000,000
Amounts due from related parties	545,000,000	539,000,000
Repayments received against related party loans	(20,000,000)
Related party loans and interest
Related Party Transaction [Line Items]
Total related party receivables	489,000,000	476,000,000
Related party loans and interest \| SeaMex seller's credit and loans receivable
Related Party Transaction [Line Items]
Total related party receivables	$ 409,000,000	398,000,000
Interest rate on related party receivable	6.50%
Related party loans and interest \| Seabras loans receivable
Related Party Transaction [Line Items]
Total related party receivables	$ 80,000,000	78,000,000
Related party loans and interest \| Seabras loans receivable \| Minimum
Related Party Transaction [Line Items]
Interest rate on related party receivable	3.40%
Related party loans and interest \| Seabras loans receivable \| LIBOR \| Maximum
Related Party Transaction [Line Items]
Interest rate on related party receivable	3.99%
Deferred consideration arrangements
Related Party Transaction [Line Items]
Total related party receivables	$ 45,000,000	59,000,000
Deferred consideration arrangements \| Seadrill Partners \| Disposed of by sale
Related Party Transaction [Line Items]
Total related party receivables	45,000,000	59,000,000
Deferred consideration arrangements \| Seadrill Partners \| Disposed of by sale \| West Polaris
Related Party Transaction [Line Items]
Total related party receivables	0	1,000,000
Adjustments, increase (decrease), Amount due from related parties			$ 1,000,000
Mobilization receivable \| Seadrill Partners \| Disposed of by sale \| West Vela
Related Party Transaction [Line Items]
Total related party receivables	24,000,000	31,000,000
Share of dayrate \| Seadrill Partners \| Disposed of by sale \| West Vela
Related Party Transaction [Line Items]
Total related party receivables	21,000,000	27,000,000
Adjustments, increase (decrease), Amount due from related parties			$ 29,000,000
Convertible bond
Related Party Transaction [Line Items]
Total related party receivables	49,000,000	43,000,000
Trading balances
Related Party Transaction [Line Items]
Total related party receivables	103,000,000	$ 138,000,000
Sellers credit \| SeaMex seller's credit and loans receivable
Related Party Transaction [Line Items]
Total related party receivables					$ 250,000,000
Working capital loan \| SeaMex seller's credit and loans receivable
Related Party Transaction [Line Items]
Total related party receivables				$ 45,000,000
Accrued interest \| SeaMex seller's credit and loans receivable
Related Party Transaction [Line Items]
Total related party receivables	114,000,000
Accrued interest \| Seabras loans receivable
Related Party Transaction [Line Items]
Total related party receivables	10,000,000
Loan principal \| Seabras loans receivable
Related Party Transaction [Line Items]
Total related party receivables	$ 70,000,000