Noble (NE) 10-Q 3 Aug 18 2018 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 31, 2018
Document Information [Line Items]
Entity Registrant Name	Noble Corp plc
Trading Symbol	NE
Entity Central Index Key	1,458,891
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		246,783,435
Noble Corp
Document Information [Line Items]
Entity Registrant Name	Noble Corporation
Entity Central Index Key	1,169,055
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		261,245,693

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 411,492	$ 662,829
Accounts receivable, net	212,229	204,696
Taxes receivable	12,811	105,345
Prepaid expenses and other current assets	60,721	66,105
Total current assets	697,253	1,038,975
Property and equipment, at cost	10,924,509	12,034,331
Accumulated depreciation	(2,403,099)	(2,545,091)
Property and equipment, net	8,521,410	9,489,240
Other assets	175,024	266,444
Total assets	9,393,687	10,794,659
Current liabilities
Current maturities of long-term debt	0	249,843
Accounts payable	93,612	84,032
Accrued payroll and related costs	41,852	54,904
Taxes payable	33,278	34,391
Interest payable	103,407	98,189
Other current liabilities	65,087	71,665
Total current liabilities	337,236	593,024
Long-term debt	3,842,617	3,795,867
Deferred income taxes	155,961	164,962
Other liabilities	284,823	290,178
Total liabilities	4,620,637	4,844,031
Commitments and contingencies
Shareholders' equity
Common stock	2,468	2,450
Additional paid-in capital	688,214	678,922
Retained earnings	3,721,433	4,637,677
Accumulated other comprehensive loss	(49,883)	(42,888)
Total shareholders' equity	4,362,232	5,276,161
Noncontrolling interests	410,818	674,467
Total equity	4,773,050	5,950,628
Total liabilities and equity	9,393,687	10,794,659
Noble Corp
Current assets
Cash and cash equivalents	410,672	662,011
Accounts receivable, net	212,229	204,696
Taxes receivable	12,811	105,345
Prepaid expenses and other current assets	60,628	65,441
Total current assets	696,340	1,037,493
Property and equipment, at cost	10,924,509	12,034,331
Accumulated depreciation	(2,403,099)	(2,545,091)
Property and equipment, net	8,521,410	9,489,240
Other assets	175,109	266,528
Total assets	9,392,859	10,793,261
Current liabilities
Current maturities of long-term debt	0	249,843
Accounts payable	93,431	83,873
Accrued payroll and related costs	41,821	54,904
Taxes payable	33,278	33,965
Interest payable	103,407	98,189
Other current liabilities	64,928	71,466
Total current liabilities	336,865	592,240
Long-term debt	3,842,617	3,795,867
Deferred income taxes	155,961	164,962
Other liabilities	284,823	290,178
Total liabilities	4,620,266	4,843,247
Commitments and contingencies
Shareholders' equity
Common stock	26,125	26,125
Additional paid-in capital	635,848	623,137
Retained earnings	3,749,685	4,669,173
Accumulated other comprehensive loss	(49,883)	(42,888)
Total shareholders' equity	4,361,775	5,275,547
Noncontrolling interests	410,818	674,467
Total equity	4,772,593	5,950,014
Total liabilities and equity	$ 9,392,859	$ 10,793,261

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares shares in Thousands	Jun. 30, 2018	Dec. 31, 2017
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Ordinary shares, shares outstanding	246,760	244,971
Noble Corp
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Ordinary shares, shares outstanding	261,246	261,246

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating revenues
Revenue from contract with customer	$ 258,369	$ 278,142	$ 493,526	$ 641,118
Operating costs and expenses
Depreciation and amortization	129,681	136,594	258,436	272,312
General and administrative	21,717	18,658	43,800	34,538
Loss on impairment	792,843	0	792,843	0
Total operating costs and expenses	1,103,975	322,427	1,396,012	639,940
Operating income (loss)	(845,606)	(44,285)	(902,486)	1,178
Other income (expense)
Interest expense, net of amounts capitalized	(74,130)	(73,209)	(150,145)	(146,656)
Loss on extinguishment of debt, net	0	0	(8,768)	0
Interest income and other, net	2,865	3,074	4,204	4,691
Loss from continuing operations before income taxes	(916,871)	(114,420)	(1,057,195)	(140,787)
Income tax benefit (provision)	38,839	18,213	35,843	(239,194)
Net loss from continuing operations	(878,032)	(96,207)	(1,021,352)	(379,981)
Net loss from discontinued operations, net of tax	0	(1,486)	0	(1,486)
Net loss	(878,032)	(97,693)	(1,021,352)	(381,467)
Net (income) loss attributable to noncontrolling interests	249,969	4,343	250,955	(13,577)
Loss from continuing operations	(628,063)	(91,864)	(770,397)	(393,558)
Net income (loss) attributable to the company	$ (628,063)	$ (93,350)	$ (770,397)	$ (395,044)
Basic:
Loss from continuing operations (usd per share)	$ (2.55)	$ (0.37)	$ (3.13)	$ (1.61)
Loss from discontinued operations (usd per share)	0	(0.01)	0	(0.01)
Net income (loss) attributable to the company (usd per share)	(2.55)	(0.38)	(3.13)	(1.62)
Diluted:
Loss from continuing operations (usd per share)	(2.55)	(0.37)	(3.13)	(1.61)
Loss from discontinued operations (usd per share)	0	(0.01)	0	(0.01)
Net income (loss) (usd per share)	$ (2.55)	$ (0.38)	$ (3.13)	$ (1.62)
Noble Corp
Operating revenues
Revenue from contract with customer	$ 258,369	$ 278,142	$ 493,526	$ 641,118
Operating costs and expenses
Depreciation and amortization	128,173	134,633	255,812	270,351
General and administrative	8,121	13,231	21,578	22,295
Loss on impairment	792,843	0	792,843	0
Total operating costs and expenses	1,088,182	314,525	1,370,035	624,853
Operating income (loss)	(829,813)	(36,383)	(876,509)	16,265
Other income (expense)
Interest expense, net of amounts capitalized	(74,130)	(73,209)	(150,145)	(146,656)
Loss on extinguishment of debt, net	0	0	(8,768)	0
Interest income and other, net	2,851	3,138	4,197	4,641
Loss from continuing operations before income taxes	(901,092)	(106,454)	(1,031,225)	(125,750)
Income tax benefit (provision)	38,733	18,213	35,737	(239,160)
Net loss from continuing operations	(862,359)	(88,241)	(995,488)	(364,910)
Net loss from discontinued operations, net of tax	0	2,967	0	2,967
Net loss	(862,359)	(85,274)	(995,488)	(361,943)
Net (income) loss attributable to noncontrolling interests	249,969	4,343	250,955	(13,577)
Net income (loss) attributable to the company	(612,390)	(80,931)	(744,533)	(375,520)
Contract drilling services
Operating revenues
Revenue from contract with customer	247,689	271,532	476,795	626,191
Operating costs and expenses
Cost of services	151,437	162,781	288,286	323,550
Contract drilling services | Noble Corp
Operating revenues
Revenue from contract with customer	247,689	271,532	476,795	626,191
Operating costs and expenses
Cost of services	150,748	162,267	287,155	322,667
Reimbursables and other
Operating revenues
Revenue from contract with customer	10,680	6,610	16,731	14,927
Operating costs and expenses
Cost of services	8,297	4,394	12,647	9,540
Reimbursables and other | Noble Corp
Operating revenues
Revenue from contract with customer	10,680	6,610	16,731	14,927
Operating costs and expenses
Cost of services	$ 8,297	$ 4,394	$ 12,647	$ 9,540

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net loss	$ (878,032)	$ (97,693)	$ (1,021,352)	$ (381,467)
Other comprehensive income (loss)
Foreign currency translation adjustments	(2,771)	94	(2,104)	280
Foreign currency forward contracts	0	849	0	739
Amortization of deferred pension plan amounts (net of tax provision of $86 and $161 for the three months ended June 30, 2018 and 2017, respectively, and $173 and $328 for the six months ended June 30, 2018 and 2017, respectively)	325	375	649	767
Other comprehensive income (loss), net	(2,446)	1,318	(1,455)	1,786
Net comprehensive (income) loss attributable to noncontrolling interests	249,969	4,343	250,955	(13,577)
Comprehensive income (loss) attributable to the company	(630,509)	(92,032)	(771,852)	(393,258)
Noble Corp
Net loss	(862,359)	(85,274)	(995,488)	(361,943)
Other comprehensive income (loss)
Foreign currency translation adjustments	(2,771)	94	(2,104)	280
Foreign currency forward contracts	0	849	0	739
Amortization of deferred pension plan amounts (net of tax provision of $86 and $161 for the three months ended June 30, 2018 and 2017, respectively, and $173 and $328 for the six months ended June 30, 2018 and 2017, respectively)	325	375	649	767
Other comprehensive income (loss), net	(2,446)	1,318	(1,455)	1,786
Net comprehensive (income) loss attributable to noncontrolling interests	249,969	4,343	250,955	(13,577)
Comprehensive income (loss) attributable to the company	$ (614,836)	$ (79,613)	$ (745,988)	$ (373,734)

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Amortization of deferred pension plan, tax provision	$ 86	$ 161	$ 173	$ 328
Noble Corp
Amortization of deferred pension plan, tax provision	$ 86	$ 161	$ 173	$ 328

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities
Net loss	$ (1,021,352)	$ (381,467)
Adjustments to reconcile net loss to net cash flow from operating activities:
Depreciation and amortization	258,436	272,312
Loss on impairment	792,843	0
Loss on extinguishment of debt, net	8,768	0
Deferred income taxes	(51,724)	303,084
Amortization of share-based compensation	12,735	15,187
Other long-term asset write-off	0	14,419
Other costs, net	3,226	2,800
Change in taxes receivable	84,486	0
Net changes in other operating assets and liabilities	(33,524)	27,950
Net cash provided by operating activities	53,894	254,285
Cash flows from investing activities
Capital expenditures	(75,874)	(67,608)
Proceeds from disposal of assets, net	3,755	314
Net cash used in investing activities	(72,119)	(67,294)
Cash flows from financing activities
Issuance of senior notes	750,000	0
Repayments of debt	(952,209)	(300,000)
Debt issuance costs on senior notes and credit facilities	(14,802)	(42)
Dividends paid to noncontrolling interests	(12,694)	(5,393)
Taxes withheld on employee stock transactions	(3,407)	(4,301)
Net cash used in financing activities	(233,112)	(309,736)
Net decrease in cash and cash equivalents	(251,337)	(122,745)
Cash and cash equivalents, beginning of period	662,829	725,722
Cash and cash equivalents, end of period	411,492	602,977
Noble Corp
Cash flows from operating activities
Net loss	(995,488)	(361,943)
Adjustments to reconcile net loss to net cash flow from operating activities:
Depreciation and amortization	255,812	270,351
Loss on impairment	792,843	0
Loss on extinguishment of debt, net	8,768	0
Deferred income taxes	(51,724)	303,084
Amortization of share-based compensation	12,711	15,154
Other long-term asset write-off	0	14,419
Other costs, net	3,226	2,800
Change in taxes receivable	84,486	0
Net changes in other operating assets and liabilities	(31,080)	25,504
Net cash provided by operating activities	79,554	269,369
Cash flows from investing activities
Capital expenditures	(75,874)	(67,608)
Proceeds from disposal of assets, net	3,755	314
Net cash used in investing activities	(72,119)	(67,294)
Cash flows from financing activities
Issuance of senior notes	750,000	0
Repayments of debt	(952,209)	(300,000)
Debt issuance costs on senior notes and credit facilities	(14,802)	(42)
Dividends paid to noncontrolling interests	(12,694)	(5,393)
Contributions from (distributions to) parent company, net	(29,069)
Contributions from (distributions to) parent company, net		51,705
Net cash used in financing activities	(258,774)	(253,730)
Net decrease in cash and cash equivalents	(251,339)	(51,655)
Cash and cash equivalents, beginning of period	662,011	653,833
Cash and cash equivalents, end of period	$ 410,672	$ 602,178

Condensed Consolidated Stateme8

Condensed Consolidated Statements of Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands		Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests	Noble Corp	Noble CorpCommon Stock	Noble CorpAdditional Paid-in Capital	Noble CorpRetained Earnings	Noble CorpAccumulated Other Comprehensive Income (Loss)	Noble CorpNoncontrolling Interests
Beginning Balance at Dec. 31, 2016		$ 6,467,445	$ 2,432	$ 654,168	$ 5,154,221	$ (52,140)	$ 708,764	$ 6,391,977	$ 26,125	$ 594,091	$ 5,115,137	$ (52,140)	$ 708,764
Beginning Balance, Shares at Dec. 31, 2016			243,239						261,246
Employee related equity activity
Amortization of share-based compensation		15,187		15,187
Issuance of share-based compensation shares		(6)	$ 17	(23)
Issuance of share-based compensation shares, Shares			1,664
Shares withheld for taxes on equity transactions		(4,318)		(4,318)
Contributions from parent company, net								51,705			51,705
Share-based compensation contribution by parent								15,154		15,154
Net income (loss)		(381,467)			(395,044)		13,577	(361,943)			(375,520)		13,577
Dividends paid to noncontrolling interests		(5,393)					(5,393)	(5,393)					(5,393)
Dividends unpaid to noncontrolling interests		(20,900)					(20,900)	(20,900)					(20,900)
Dividend equivalents	[1]	83			83
Other comprehensive loss, net		1,786				1,786		1,786				1,786
Ending Balance at Jun. 30, 2017		6,072,417	$ 2,449	665,014	4,759,260	(50,354)	696,048	6,072,386	$ 26,125	609,245	4,791,322	(50,354)	696,048
Ending Balance, Shares at Jun. 30, 2017			244,903						261,246
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' equity, adjusted balance		5,799,202	$ 2,450	678,922	4,491,791	(48,428)	674,467	5,798,588	$ 26,125	623,137	4,523,287	(48,428)	674,467
Employee related equity activity
Adjustment for adopting the revenue recognition standard								(149,938)			(149,938)
Adjustment for adopting the revenue recognition standard | Accounting Standards Update 2016-16		(149,938)			(149,938)
Adjustment for adopting the revenue recognition standard | Accounting Standards Update 2014-09		(1,488)			(1,488)			(1,488)			(1,488)
Beginning Balance at Dec. 31, 2017		$ 5,950,628	$ 2,450	678,922	4,637,677	(42,888)	674,467	$ 5,950,014	$ 26,125	623,137	4,669,173	(42,888)	674,467
Beginning Balance, Shares at Dec. 31, 2017		244,971	244,971					261,246	261,246
Employee related equity activity
Amortization of share-based compensation		$ 12,735		12,735
Issuance of share-based compensation shares		0	$ 18	(18)
Issuance of share-based compensation shares, Shares			1,789
Shares withheld for taxes on equity transactions		(3,425)		(3,425)
Distributions to parent company, net								$ (29,069)			(29,069)
Share-based compensation contribution by parent								12,711		12,711
Net income (loss)		(1,021,352)			(770,397)		(250,955)	(995,488)			(744,533)		(250,955)
Stranded tax effect resulting from the Tax Cuts and Job Act		(5,540)			5,500
Dividends paid to noncontrolling interests		(12,694)					(12,694)	(12,694)					(12,694)
Dividend equivalents	[1]	39			39
Other comprehensive loss, net		(1,455)				(1,455)		(1,455)				(1,455)
Ending Balance at Jun. 30, 2018		$ 4,773,050	$ 2,468	$ 688,214	$ 3,721,433	$ (49,883)	$ 410,818	$ 4,772,593	$ 26,125	$ 635,848	$ 3,749,685	$ (49,883)	$ 410,818
Ending Balance, Shares at Jun. 30, 2018		246,760	246,760					261,246	261,246
[1]	Activity associated with dividend equivalents, which are related to performance awards granted in 2016, to be paid upon vesting.

Organization and Basis of Prese

Organization and Basis of Presentation	6 Months Ended
	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	Note 1— Organization and Basis of Presentation Noble Corporation plc, a public limited company incorporated under the laws of England and Wales (“Noble-UK”), is a leading offshore drilling contractor for the oil and gas industry. We provide contract drilling services with our global fleet of mobile offshore drilling units. As of June 30, 2018 , our fleet consisted of eight drillships, four semisubmersibles and 12 jackups. We report our contract drilling operations as a single reportable segment, Contract Drilling Services, which reflects how we manage our business. The mobile offshore drilling units comprising our offshore rig fleet operate in a global market for contract drilling services and are often redeployed to different regions due to changing demands of our customers, which consist primarily of large, integrated, independent and government-owned or controlled oil and gas companies throughout the world. Noble Corporation, a Cayman Islands company (“Noble-Cayman”), is an indirect, wholly-owned subsidiary of Noble-UK, our publicly-traded parent company. Noble-UK’s principal asset is all of the shares of Noble-Cayman. Noble-Cayman has no public equity outstanding. The condensed consolidated financial statements of Noble-UK include the accounts of Noble-Cayman, and Noble-UK conducts substantially all of its business through Noble-Cayman and its subsidiaries. The accompanying unaudited condensed consolidated financial statements of Noble-UK and Noble-Cayman have been prepared pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) as they pertain to Quarterly Reports on Form 10-Q. Accordingly, certain information and disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted pursuant to such rules and regulations. The unaudited financial statements reflect all adjustments which are, in the opinion of management, necessary for a fair statement of the financial position and results of operations for the interim periods, on a basis consistent with the annual audited consolidated financial statements. All such adjustments are of a recurring nature. The December 31, 2017 Condensed Consolidated Balance Sheets presented herein are derived from the December 31, 2017 audited consolidated financial statements. These interim financial statements should be read in conjunction with the consolidated financial statements and notes included in our Annual Report on Form 10-K for the year ended December 31, 2017 , filed by both Noble-UK and Noble-Cayman. The results of operations for interim periods are not necessarily indicative of the results to be expected for the full year. We have made certain reclassifications to our prior period amounts in our operating revenue by combining other revenue with reimbursables revenue to conform to the current period presentation. Such reclassification did not have a material effect on our condensed consolidated statements of operations. We have made certain reclassifications to our prior period amounts in our investing activities by combining changes in accrued capital expenditures with capital expenditures to conform to the current period presentation. Such reclassification did not have a material effect on our condensed consolidated statements of cash flows.

Accounting Pronouncements

Accounting Pronouncements	6 Months Ended
	Jun. 30, 2018
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Accounting Pronouncements	Note 2— Accounting Pronouncements Accounting Standards Adopted In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-9, which creates Accounting Standards Codification (“ASC”) Topic 606, “Revenue from Contracts with Customers,” and supersedes the revenue recognition requirements in Topic 605, “Revenue Recognition,” including most industry-specific revenue recognition guidance throughout the Industry Topics of the Codification. In addition, ASU No. 2014-9 supersedes the cost guidance in Subtopic 605-35, “Revenue Recognition—Construction-Type and Production-Type Contracts,” and creates new Subtopic 340-40, “Other Assets and Deferred Costs—Contracts with Customers.” Under the new guidance, revenue is recognized when a customer obtains control of promised goods or services and in an amount that reflects the consideration the entity expects to receive in exchange for those goods or services. We adopted ASU 2014-09 and its related amendments, or collectively Topic 606, effective January 1, 2018 using the modified retrospective implementation method. Accordingly, we have applied the five-step method outlined in Topic 606 for determining when and how revenue is recognized to all contracts that were not completed as of the date of adoption. Revenues for reporting periods beginning after January 1, 2018 are presented under Topic 606, while prior period amounts have not been adjusted and continue to be reported under the previous revenue recognition guidance. For contracts that were modified before the effective date, we have considered the modification guidance within the new standard and determined that the revenue recognized and contract balances recorded prior to adoption for such contracts were not impacted. While Topic 606 requires additional disclosure of the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers, its adoption has not had a material impact on the measurement or recognition of our revenues. Our modified retrospective adoption, for which we were not required to make any material changes to the prior year presentation, did not have a material effect on our condensed consolidated financial statements. In October 2016, the FASB issued ASU No. 2016-16, which amends ASC Topic 740, “Income Taxes.” The amendments in this update improve the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. This standard is effective for interim and annual reporting periods beginning after December 15, 2017. We have adopted the new standard effective January 1, 2018 under the modified retrospective approach. Accordingly, “Other Assets” is reduced in our Condensed Consolidated Balance Sheet with a cumulative adjustment to retained earnings of approximately $149.9 million . In February 2018 , the FASB issued ASU No. 2018-2, which amends ASC Topic 220, “Income Statement—Reporting Comprehensive Income.” The amendments in this update allow for a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act (the “Act”). This standard is effective for interim and annual reporting periods beginning after December 15, 2018 with early application permitted. We have elected to adopt the new standard effective January 1, 2018 under the modified retrospective approach. The amendment should be applied on a retrospective basis to each period in which the effect of the change in the U.S. federal corporate income tax rate in the Act was recognized. As a result of the retrospective application, we will reduce “Accumulated Other Comprehensive Income” in our Condensed Consolidated Balance Sheet with a cumulative adjustment to “Retained Earnings” of approximately $5.5 million . In March 2017, the FASB issued ASU No. 2017-7, which amends ASC Topic 715, “Compensation —Retirement Benefits; Improving the Presentation of Net Periodic Pension Cost and Postretirement Benefits Cost.” The amendments in this update require that an employer disaggregate the service cost component from the other components of net benefit cost for an entity's defined benefit pension and other postretirement plans. The amendments also provide explicit guidance on how to present the service cost component and the other components of net benefit cost in the income statement and allow only the service cost component of net benefit cost to be eligible for capitalization. The amendments in this update require that an employer report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit costs, as defined in paragraphs 715-30-35-4 and 715-60-35-9, are required to be presented in the income statement separately from the service cost component and outside of income from operations. We adopted ASU No. 2017-7 effective January 1, 2018 and accordingly, we have made certain reclassifications between our “Contract drilling services” costs and “Interest income and other, net” on our Condensed Consolidated Statement of Operations. Issued Accounting Standards In February 2016, the FASB issued ASU No. 2016-2, which creates ASC Topic 842, “Leases.” This standard is effective for interim and annual reporting periods beginning after December 15, 2018 . We expect to adopt, on a modified retrospective basis, ASC 842 effective January 1, 2019 . Our adoption requires that, as lessees, we recognize a right to use asset and lease liability. In addition, as lessors, our drilling contracts contain a lease component, which requires revenue presentation analysis. The ultimate effect on our consolidated financial statements, will be based on an evaluation of the contract-specific facts and circumstances. We do not expect our adoption to materially affect our Condensed Consolidated Balance Sheet, Condensed Consolidated Statement of Operations, or Condensed Consolidated Statement of Cash Flows. We are currently evaluating what other effect, if any, ASC 842 will have on our condensed consolidated financial statements and related disclosures. With the exception of the updated standards discussed above, there have been no new accounting pronouncements not yet effective that have significance, or potential significance, to our condensed consolidated financial statements.

Consolidated Joint Ventures

Consolidated Joint Ventures	6 Months Ended
	Jun. 30, 2018
Noncontrolling Interest [Abstract]
Consolidated Joint Ventures	Note 3— Consolidated Joint Ventures We maintain a 50 percent interest in two joint ventures, each with a subsidiary of Royal Dutch Shell plc (“Shell”), that own and operate the two Bully -class drillships. We have determined that we are the primary beneficiary of the joint ventures. Accordingly, we consolidate the entities in our condensed consolidated financial statements after eliminating intercompany transactions. Shell’s equity interests are presented as noncontrolling interests on our Condensed Consolidated Balance Sheets. During the six months ended June 30, 2018 , the Bully joint ventures approved and paid dividends of $25.4 million . During the six months ended June 30, 2017 , the Bully joint ventures approved dividends of $52.6 million and paid dividends of $10.8 million . Of these amounts, 50 percent was paid to our joint venture partner. The combined carrying amount of the Bully -class drillships at June 30, 2018 and December 31, 2017 totaled $0.7 billion and $1.3 billion , respectively. These assets were primarily funded through partner equity contributions. During the three and six months ended June 30, 2018 , we recognized a $550.3 million impairment on the Noble Bully I , of which $250.3 million is attributable to our joint venture partner. See “ Note 10— Loss on Impairment ” for additional information. Cash held by the Bully joint ventures totaled approximately $41.3 million at June 30, 2018 as compared to approximately $41.6 million at December 31, 2017 .

Loss Per Share

Loss Per Share	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Loss Per Share	Note 4— Loss Per Share The following table presents the computation of basic and diluted earnings per share for Noble-UK: Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Numerator: Basic Net loss from continuing operations $ (628,063 ) $ (91,864 ) $ (770,397 ) $ (393,558 ) Net loss from discontinued operations, net of tax — (1,486 ) — (1,486 ) Net loss attributable to Noble Corporation plc $ (628,063 ) $ (93,350 ) $ (770,397 ) $ (395,044 ) Diluted Net loss from continuing operations $ (628,063 ) $ (91,864 ) $ (770,397 ) $ (393,558 ) Net loss from discontinued operations, net of tax — (1,486 ) — (1,486 ) Net loss attributable to Noble Corporation plc $ (628,063 ) $ (93,350 ) $ (770,397 ) $ (395,044 ) Denominator: Weighted average shares outstanding - basic 246,740 244,828 246,438 244,527 Weighted average shares outstanding - diluted 246,740 244,828 246,438 244,527 Loss per share Basic: Loss from continuing operations $ (2.55 ) $ (0.37 ) $ (3.13 ) $ (1.61 ) Loss from discontinued operations — (0.01 ) — (0.01 ) Net loss attributable to Noble Corporation plc $ (2.55 ) $ (0.38 ) $ (3.13 ) $ (1.62 ) Diluted: Loss from continuing operations $ (2.55 ) $ (0.37 ) $ (3.13 ) $ (1.61 ) Loss from discontinued operations — (0.01 ) — (0.01 ) Net loss attributable to Noble Corporation plc $ (2.55 ) $ (0.38 ) $ (3.13 ) $ (1.62 ) Only those items having a dilutive impact on our basic earnings per share are included in diluted earnings per share. For the three and six months ended June 30, 2018 , approximately 13.4 million share-based awards were excluded from diluted earnings per share since the effect would have been anti-dilutive. For the three and six months ended June 30, 2017 , approximately 12.6 million share-based awards were excluded from diluted earnings per share for the same reason. Share capital As of June 30, 2018 , Noble-UK had approximately 246.8 million shares outstanding and trading as compared to approximately 245.0 million shares outstanding and trading at December 31, 2017 . At our 2018 Annual General Meeting shareholders approved a proposal to allow our Board of Directors to increase share capital through the issuance of up to 82.2 million ordinary shares (at current nominal value of $0.01 per share). The right of our directors to allot shares will expire at the end of our 2019 Annual General Meeting unless we seek an extension from shareholders at that time. There were no shares allotted during the six months ended June 30, 2018 . The declaration and payment of dividends require the authorization of the Board of Directors of Noble-UK, provided that such dividends on issued share capital may be paid only out of Noble-UK’s “distributable reserves” on its statutory balance sheet in accordance with UK law. Noble-UK is not permitted to pay dividends out of share capital, which includes share premiums. Noble has not paid dividends since the third quarter of 2016 . The payment of future dividends will depend on our results of operations, financial condition, cash requirements, future business prospects, contractual and indenture restrictions and other factors deemed relevant by our Board of Directors. Share repurchases Under UK law, the Company is only permitted to purchase its own shares by way of an “off-market purchase” in a plan approved by shareholders. We currently do not have shareholder authority to repurchase shares.

Receivables from Customers

Receivables from Customers	6 Months Ended
	Jun. 30, 2018
Receivables [Abstract]
Receivables from Customers	Note 5— Receivables from Customers At December 31, 2016 , we had receivables of approximately $14.4 million related to the Noble Max Smith , which had been disputed by our former customer, Petróleos Mexicanos (“Pemex”) and were classified as long-term and included in “Other assets” on our Condensed Consolidated Balance Sheet. The receivables were related to lost revenues for downtime that occurred after our rig was damaged when one of Pemex’s supply boats collided with our rig in 2010. A Mexican subsidiary of Paragon Offshore plc (“Paragon Offshore”), which had operated the Noble Max Smith , had been prosecuting the claim against Pemex. As of December 31, 2017 , Paragon Offshore announced that, as part of its bankruptcy plan, it will liquidate the Mexican entity involved. While Noble owns all rights to amounts from that claim and will take available actions to recover such amounts, we believe the announced actions by Paragon Offshore create uncertainty relating to the prosecution of the claim and associated recovery, and accordingly, the disputed amounts of approximately $14.4 million were written off through “Contract drilling services” costs during the six months ended June 30, 2017 .

Property and Equipment

Property and Equipment	6 Months Ended
	Jun. 30, 2018
Property, Plant and Equipment [Abstract]
Property and Equipment	Note 6— Property and Equipment Property and equipment, at cost, for Noble-UK consisted of the following: June 30, 2018 December 31, 2017 Drilling equipment and facilities $ 10,610,440 $ 11,746,629 Construction in progress 111,304 83,509 Other 202,765 204,193 Property and equipment, at cost $ 10,924,509 $ 12,034,331 During the three and six months ended June 30, 2018 , we recognized a non-cash loss on impairment of $792.8 million , related to our long-lived assets. See “ Note 10— Loss on Impairment ” for additional information.

Debt

Debt	6 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Debt	Note 7— Debt Credit Facilities 2015 Credit Facility At December 31, 2017 , we had a five -year $2.4 billion senior unsecured credit facility that will mature in January 2020 and is guaranteed by our indirect, wholly-owned subsidiaries, Noble Holding (U.S.) LLC (“NHUS”) and Noble Holding International Limited (“NHIL”) (the “ 2015 Credit Facility”). At December 31, 2017 , the 2015 Credit Facility also provided us with the ability to issue up to $500.0 million in letters of credit. On December 19, 2017 , we entered into the First Amendment and Consent and Successor Agent Agreement (the “Amendment”) amending the 2015 Credit Facility. On January 3, 2018 , the Amendment to the 2015 Credit Facility became fully effective. The Amendment caused, among other things, a reduction in the aggregate principal amount of commitments under the 2015 Credit Facility to $300.0 million and the termination of the 2015 Credit Facility's letter of credit sub-facility. The maturity of the 2015 Credit Facility remains January 2020 . As a result of the 2015 Credit Facility's reduction in the aggregate principal amount of commitments, we recognized a net loss of approximately $2.3 million in the six months ended June 30, 2018 . At June 30, 2018 , we had no borrowings outstanding under the 2015 Credit Facility. 2017 Credit Facility On December 21, 2017 , Noble Cayman Limited, a Cayman Islands company and a wholly-owned indirect subsidiary of Noble-Cayman (“NCL”); Noble International Finance Company, a Cayman Islands company and a wholly-owned indirect subsidiary of Noble-Cayman (“NIFCO”); and Noble Holding UK Limited, a company incorporated under the laws of England and Wales and a wholly-owned direct subsidiary of Noble-UK (“NHUK”), as parent guarantor, entered into a new senior unsecured credit agreement (the “ 2017 Credit Facility” and, together with the 2015 Credit Facility, the “Credit Facilities”). The maximum aggregate amount of commitments under the 2017 Credit Facility of approximately $1.5 billion became available in January 2018 upon satisfaction of certain conditions, including the effectiveness of the commitment reduction under the 2015 Credit Facility. Borrowings under the 2017 Credit Facility are subject to certain conditions precedent, including that there be no unused commitments to advance loans under the 2015 Credit Facility. Borrowings may be used for working capital and other general corporate purposes. The 2017 Credit Facility provides for a letter of credit sub-facility currently in the amount of $15.0 million , with the ability to increase such amount up to $500.0 million with the approval of the lenders. The 2017 Credit Facility will mature in January 2023 . At June 30, 2018 , we had no borrowings outstanding or letters of credit issued under the 2017 Credit Facility. Both of our Credit Facilities have provisions which vary the applicable interest rates for borrowings based upon our debt ratings. We also pay a facility fee under the 2015 Credit Facility on the full commitments thereunder (used or unused) and a commitment fee under the 2017 Credit Facility on the daily unused amount of the underlying commitments, in each case which varies depending on our credit ratings. At June 30, 2018 , the interest rates in effect under our Credit Facilities are the highest permitted interest rates under those agreements. Debt Issuance In January 2018 , we issued $750.0 million aggregate principal amount of our Senior Notes due 2026 (the “ 2026 Notes”) through our indirect wholly-owned subsidiary, NHIL. The net proceeds of the offering of approximately $737.4 million , after estimated expenses, were used to retire a portion of our near-term senior notes in a related tender offer. The indenture for the 2026 Notes contains certain covenants and restrictions, including, among others, restrictions on our subsidiaries’ ability to incur certain additional indebtedness. Additionally, the Subsidiary Guarantors must own, directly or indirectly, (i) assets comprising at least 85% of the revenue of Noble-Cayman and its subsidiaries on a consolidated basis and (ii) jackups, semisubmersibles, drillships, submersibles or other mobile offshore drilling units of material importance, the combined book value of which comprises at least 85% of the combined book value of all such assets of Noble-Cayman and its subsidiaries on a consolidated basis, in each case, with respect to the most recently completed fiscal year. Senior Notes Interest Rate Adjustments During 2016 and 2017 , we experienced debt rating downgrades by Moody’s Investors Service and S&P Global Ratings, which reduced our debt ratings below investment grade. As a result of these downgrades, we experienced interest rate increases during 2016 and 2017 on our Senior Notes due 2018 (the “ 2018 Notes”), our Senior Notes due 2025 (the “ 2025 Notes”) and our Senior Notes due 2045 (the “ 2045 Notes”), all of which are subject to provisions that vary the applicable interest rates based on our debt rating. On October 18, 2017 , S&P Global Ratings further reduced our debt rating, which increased the interest rates on the 2025 Notes and the 2045 Notes to 7.95% and 8.95% , respectively, effective April 2018 . These senior notes have reached the contractually defined maximum interest rate set for each rating agency and no further interest rate increases are possible. The interest rates on these senior notes may be decreased if our debt ratings were to be raised by either rating agency above specified levels. Our other outstanding senior notes do not contain provisions varying applicable interest rates based upon our credit ratings. Debt Tender Offers and Repayments In January 2018 , we commenced cash tender offers for the 2018 Notes, our Senior Notes due 2019 (the “ 2019 Notes”), our Senior Notes due 2020 , our Senior Notes due 2021 , our Senior Notes due 2022 and our Senior Notes due 2024 . In February 2018 , we purchased $754.2 million aggregate principal amount of these senior notes for $750.0 million , plus accrued interest, using the net proceeds of the 2026 Notes issuance and cash on hand. As a result of this transaction, we recognized a net loss of approximately $3.5 million . In February 2018 , we redeemed the remaining principal amount of $61.9 million of the 2019 Notes for approximately $65.3 million , plus accrued interest. As a result of this transaction, we recognized a net loss of approximately $3.5 million . In March 2018 , we repaid the remaining aggregate principal amount of $126.6 million of the 2018 Notes at maturity using cash on hand. In March 2018 , we purchased $9.5 million aggregate principal amount of various tranches of our senior notes for approximately $8.7 million , plus accrued interest, as open market repurchases and recognized a net gain of approximately $0.5 million . Covenants The 2015 Credit Facility is guaranteed by NHUS and NHIL. The 2015 Credit Facility contains a covenant that limits our ratio of debt to total tangible capitalization, as defined in the 2015 Credit Facility, to 0.60 at the end of each fiscal quarter. The 2017 Credit Facility contains certain financial covenants applicable to NHUK and its subsidiaries, including (i) a covenant restricting debt to total tangible capitalization to not greater than 0.55 at the end of each fiscal quarter, (ii) a minimum Liquidity requirement of $300.0 million , (iii) a covenant that, beginning with the fiscal quarter ending March 31, 2018 , the ratio of the Rig Value (as defined in the 2017 Credit Facility) of Marketed Rigs (as defined in the 2017 Credit Facility) to the sum of commitments under the 2017 Credit Facility plus indebtedness for borrowed money of the borrowers and guarantors, in each case, that directly own Marketed Rigs, is not less than 3:00 to 1:00 at the end of each fiscal quarter and (iv) a covenant that, beginning with the fiscal quarter ending March 31, 2018 , the ratio of (A) the Rig Value of the Closing Date Rigs (as defined in the 2017 Credit Facility) that are directly wholly owned by the borrowers and guarantors to (B) the Rig Value of the Closing Date Rigs owned by NHUK, subsidiaries of NHUK and certain local content affiliates, is not less than 80% at the end of each fiscal quarter (such covenants described in (iii) and (iv) of this paragraph, the “Guarantor Ratio Covenants”). The 2017 Credit Facility also includes restrictions on borrowings if, after giving effect to any such borrowings and the application of the proceeds thereof, the aggregate amount of Available Cash (as defined in the 2017 Credit Facility) would exceed $200.0 million . NHUK has guaranteed the obligations of the borrowers under the 2017 Credit Facility. In addition, on January 19, 2018 certain indirect subsidiaries of Noble-UK became guarantors under the 2017 Credit Facility, including Noble Dave Beard Limited, Noble Drilling (TVL) Ltd., Noble Resources Limited, Noble SA Limited, Noble Bob Douglas LLC, Noble Drilling Holding LLC, Noble Drilling International GmbH, Noble Leasing (Switzerland) GmbH, and Noble Leasing III (Switzerland) GmbH. Certain other subsidiaries of Noble-UK may be required from time to time to guarantee the obligations of the borrowers under the 2017 Credit Facility in order maintain compliance with the Guarantor Ratio Covenants. The 2017 Credit Facility contains additional restrictive covenants generally applicable to NHUK and its subsidiaries, including restrictions on the incurrence of liens and indebtedness, mergers and other fundamental changes, restricted payments, repurchases and redemptions of indebtedness with maturities outside of the maturity of the 2017 Credit Facility, sale and leaseback transactions and transactions with affiliates. In addition to the covenants from the Credit Facilities noted above and the covenants from the 2026 Notes described under “—Debt Issuance” above, the indentures governing our outstanding senior unsecured notes contain covenants that place restrictions on certain merger and consolidation transactions, unless we are the surviving entity or the other party assumes the obligations under the indenture, and on the ability to sell or transfer all or substantially all of our assets. In addition, there are restrictions on incurring or assuming certain liens and on entering into sale and lease-back transactions. At June 30, 2018 , we were in compliance with all applicable debt covenants. We continually monitor compliance with the covenants under our Credit Facilities and senior notes and expect to remain in compliance throughout 2018 . Fair Value of Debt Fair value represents the amount at which an instrument could be exchanged in a current transaction between willing parties. The estimated fair value of our senior notes was based on the quoted market prices for similar issues or on the current rates offered to us for debt of similar remaining maturities (Level 2 measurement). All remaining fair value disclosures are presented in “ Note 14— Fair Value of Financial Instruments .” The following table presents the carrying value, net of unamortized debt issuance costs and discounts, and the estimated fair value of our total debt, not including the effect of unamortized debt issuance costs, respectively: June 30, 2018 December 31, 2017 Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Senior unsecured notes: 5.75% Senior Notes due March 2018 $ — $ — $ 249,843 $ 250,830 7.50% Senior Notes due March 2019 — — 201,535 206,881 4.90% Senior Notes due August 2020 65,786 64,773 167,422 163,283 4.625% Senior Notes due March 2021 92,865 89,655 208,095 195,687 3.95% Senior Notes due March 2022 41,606 38,170 125,307 107,348 7.75% Senior Notes due January 2024 782,057 760,838 971,498 861,160 7.95% Senior Notes due April 2025 446,308 416,727 446,106 380,732 7.875% Senior Notes due February 2026 737,900 772,695 — — 6.20% Senior Notes due August 2040 396,771 291,504 396,738 274,988 6.05% Senior Notes due March 2041 394,569 288,936 394,514 273,988 5.25% Senior Notes due March 2042 494,125 341,250 494,063 315,430 8.95% Senior Notes due April 2045 390,630 358,760 390,589 320,396 Total debt 3,842,617 3,423,308 4,045,710 3,350,723 Current maturities of long-term debt — — 249,843 250,830 Long-term debt $ 3,842,617 $ 3,423,308 $ 3,795,867 $ 3,099,893

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	6 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	Note 8— Accumulated Other Comprehensive Income (Loss) The following table presents the changes in the accumulated balances for each component of AOCI for the six months ended June 30, 2018 and 2017 . All amounts within the table are shown net of tax. Unrealized Losses on Cash Flow Hedges (1) Defined Benefit Pension Items (2) Foreign Currency Items Total Balance at December 31, 2016 $ — $ (35,865 ) $ (16,275 ) $ (52,140 ) Activity during period: Other comprehensive income before reclassifications 739 — 280 1,019 Amounts reclassified from AOCI — 767 — 767 Net other comprehensive income 739 767 280 1,786 Balance at June 30, 2017 $ 739 $ (35,098 ) $ (15,995 ) $ (50,354 ) Balance at December 31, 2017 $ — $ (27,603 ) $ (15,285 ) $ (42,888 ) Activity during period: Stranded tax effect resulting from the Act (Note 2) — (5,540 ) — (5,540 ) Balance at January 1, 2018 — (33,143 ) (15,285 ) (48,428 ) Activity during period: Other comprehensive loss before reclassifications — — (2,104 ) (2,104 ) Amounts reclassified from AOCI — 649 — 649 Net other comprehensive income (loss) — 649 (2,104 ) (1,455 ) Balance at June 30, 2018 $ — $ (32,494 ) $ (17,389 ) $ (49,883 ) (1) Unrealized losses on cash flow hedges are related to foreign currency forward contracts. Reclassifications from AOCI are recognized through “Contract drilling services” costs on our Condensed Consolidated Statements of Operations. See “ Note 13— Derivative Instruments and Hedging Activities ” for additional information. (2) Defined benefit pension items relate to actuarial changes. Reclassifications from AOCI are recognized as expense on our Condensed Consolidated Statements of Operations through either “Contract drilling services” or “General and administrative.” See “ Note 12— Employee Benefit Plans ” for additional information.

Revenue and Customers

Revenue and Customers	6 Months Ended
	Jun. 30, 2018
Revenue from Contract with Customer [Abstract]
Revenue and Customers	Note 9— Revenue and Customers Overview The activities that primarily drive the revenue earned in our drilling contracts include (i) providing a drilling rig and the crew and supplies necessary to operate the rig, (ii) mobilizing and demobilizing the rig to and from the drill site, and (iii) performing rig preparation activities and/or modifications required for the contract. Consideration received for performing these activities may consist of dayrate drilling revenue, mobilization and demobilization revenue, contract preparation revenue and reimbursement revenue. We account for these integrated services provided within our drilling contracts as a single performance obligation satisfied over time and comprised of a series of distinct time increments in which we provide drilling services. Our standard drilling contracts require that we operate the rig at the direction of the customer throughout the contract term (which is the period we estimate to be benefited from the corresponding activities and generally ranges from two to 60 months). The activities performed and the level of service provided can vary hour to hour. Our obligation under a standard contract is to provide whatever level of service is required by the operator, or customer, over the term of the contract. We are, therefore, under a stand-ready obligation throughout the entire contract duration. Consideration for our stand-ready obligation corresponds to distinct time increments, though the rate may be variable depending on various factors, and is recognized in the period in which the services are performed. The total transaction price is determined for each individual contract by estimating both fixed and variable consideration expected to be earned over the term of the contract. We have elected to exclude from the transaction price measurement all taxes assessed by a governmental authority. See further discussion regarding the allocation of the transaction price to the remaining performance obligations below. The amount estimated for variable consideration may be subject to interrupted or restricted rates and is only included in the transaction price to the extent that it is probable that a significant reversal of previously recognized revenue will not occur throughout the term of the contract (“constrained revenue”). When determining if variable consideration should be constrained, management considers whether there are factors outside the Company’s control that could result in a significant reversal of revenue as well as the likelihood and magnitude of a potential reversal of revenue. These estimates are re-assessed each reporting period as required. Dayrate Drilling Revenue. Our drilling contracts generally provide for payment on a dayrate basis, with higher rates for periods when the drilling unit is operating and lower rates or zero rates for periods when drilling operations are interrupted or restricted. The dayrate invoices billed to the customer are typically determined based on the varying rates applicable to the specific activities performed on an hourly basis. Such dayrate consideration is allocated to the distinct hourly increment it relates to within the contract term, and therefore, recognized in line with the contractual rate billed for the services provided for any given hour. Mobilization/Demobilization Revenue. We may receive fees (on either a fixed lump-sum or variable dayrate basis) for the mobilization and demobilization of our rigs. These activities are not considered to be distinct within the context of the contract and, therefore, the associated revenue is allocated to the overall performance obligation and the associated pre-operating costs are deferred. We record a contract liability for mobilization fees received and a deferred asset for costs. Both revenue and pre-operating costs are recognized ratably over the initial term of the related drilling contract. In most contracts, there is uncertainty as to the amount of expected demobilization revenue due to contractual provisions that stipulate that certain conditions must be present at contract completion for such revenue to be received and as to the amount thereof, if any. For example, contractual provisions may require that a rig demobilize a certain distance before the demobilization revenue is payable or the amount may vary dependent upon whether or not the rig has additional contracted work within a certain distance from the wellsite. Therefore, the estimate for such revenue may be constrained, as described earlier, depending on the facts and circumstances pertaining to the specific contract. We assess the likelihood of receiving such revenue based on past experience and knowledge of the market conditions. In cases where demobilization revenue is expected to be received upon contract completion, it is estimated as part of the overall transaction price at contract inception and recognized in earnings ratably over the initial term of the contract with an offset to an accretive contract asset. Contract Preparation Revenue. Some of our drilling contracts require downtime before the start of the contract to prepare the rig to meet customer requirements. At times, we may be compensated by the customer for such work (on either a fixed lump-sum or variable dayrate basis). These activities are not considered to be distinct within the context of the contract and, therefore, the related revenue is allocated to the overall performance obligation and recognized ratably over the initial term of the related drilling contract. We record a contract liability for contract preparation fees received, which is amortized ratably to contract drilling revenue over the initial term of the related drilling contract. Bonuses, Penalties and Other Variable Consideration. We may receive bonus increases to revenue or penalty decreases to revenue. Based on historical data, and ongoing communication with the operator/customer, we are able to reasonably estimate this variable consideration. We will record such estimated variable consideration and re-measure our estimates at each reporting date. For revenue estimated, but not received, we will record to “Prepaid expenses and other current assets” on our Condensed Consolidated Balance Sheets. Capital Modification Revenue . From time to time, we may receive fees from our customers for capital improvements to our rigs to meet contractual requirements (on either a fixed lump-sum or variable dayrate basis). Such revenue is allocated to the overall performance obligation and recognized ratably over the initial term of the related drilling contract as these activities are integral to our drilling activities and are not considered to be a stand-alone service provided to the customer within the context of our contracts. We record a contract liability for such fees and recognize them ratably as contract drilling revenue over the initial term of the related drilling contract. Revenues Related to Reimbursable Expenses . We generally receive reimbursements from our customers for the purchase of supplies, equipment, personnel services and other services provided at their request in accordance with a drilling contract or other agreement. Such reimbursable revenue is variable and subject to uncertainty, as the amounts received and timing thereof is highly dependent on factors outside of our influence. Accordingly, reimbursable revenue is constrained revenue and not included in the total transaction price until the uncertainty is resolved, which typically occurs when the related costs are incurred on behalf of a customer. We are generally considered a principal in such transactions and record the associated revenue at the gross amount billed to the customer as “Revenues related to reimbursable expenses” in our Condensed Consolidated Statements of Operations. Such amounts are recognized ratably over the period within the contract term, during which the corresponding goods and services are to be consumed. Contract Balances Accounts receivable are recognized when the right to consideration becomes unconditional based upon contractual billing schedules. Payment terms on invoiced amounts are typically 30 days. Current contract asset and liability balances are included in “prepaid expenses and other current assets” and “other current liabilities,” respectively, and noncurrent contract assets and liabilities are included in “other assets” and “other liabilities,” respectively, on our Condensed Consolidated Balance Sheets. The following table provides information about contract assets and contract liabilities from contracts with customers: June 30, 2018 January 1, 2018 Current contract assets $ 28,207 $ 21,229 Noncurrent contract assets 31,551 34,520 Total contract assets 59,758 55,749 Current contract liabilities (deferred revenue) (38,074 ) (35,422 ) Noncurrent contract liabilities (deferred revenue) (60,602 ) (73,439 ) Total contract liabilities $ (98,676 ) $ (108,861 ) Significant changes in the remaining performance obligation contract assets and the contract liabilities balances for the six months ended June 30, 2018 are as follows: Contract Assets Contract Liabilities Net balance at January 1, 2018 $ 55,749 $ (108,861 ) Amortization of deferred costs (13,684 ) — Additions to deferred costs 17,693 — Amortization of deferred revenue — 21,597 Additions to deferred revenue — (11,412 ) Total 4,009 10,185 Net balance at June 30, 2018 $ 59,758 $ (98,676 ) We have elected, as a practical expedient, not to disclose significant changes in the remaining performance obligation for the six months ended June 30, 2017 , which was before our adoption date of January 1, 2018 . Contract Costs Certain direct and incremental costs incurred for upfront preparation, initial rig mobilization and modifications are costs of fulfilling a contract and are recoverable. These recoverable costs are deferred and amortized ratably to contract drilling expense as services are rendered over the initial term of the related drilling contract. Certain of our contracts include capital rig enhancements used to satisfy our performance obligations. These capital items are capitalized and depreciated in accordance with our existing property and equipment accounting policy. Costs incurred for the demobilization of rigs at contract completion are recognized as incurred during the demobilization process. Costs incurred for rig modifications or upgrades required for a contract, which are considered to be capital improvements, are capitalized as drilling and other property and equipment and depreciated over the estimated useful life of the improvement. Transaction Price Allocated to the Remaining Performance Obligations The following table reflects revenue expected to be recognized in the future related to unsatisfied performance obligations, by rig type, at the end of the reporting period: Six Months Ended 2018 2019 2020 2021 2022 and beyond Total Drillships $ 15,207 $ 16,963 $ 15,657 $ 15,657 $ 12,826 $ 76,310 Jackups 8,076 10,622 3,668 — — 22,366 Total (1) $ 23,283 $ 27,585 $ 19,325 $ 15,657 $ 12,826 $ 98,676 (1) Our Semisubmersible fleet contained no unsatisfied performance obligations as of June 30, 2018 . The revenue included above consists of expected mobilization, demobilization, and upgrade revenue for unsatisfied performance obligations. The amounts are derived from the specific terms within drilling contracts that contain such provisions, and the expected timing for recognition of such revenue is based on the estimated start date and duration of each respective contract based on information known at June 30, 2018 . The actual timing of recognition of such amounts may vary due to factors outside of our control. We have taken the optional exemption, permitted by accounting standards, to exclude disclosure of the estimated transaction price related to the variable portion of unsatisfied performance obligations at the end of the reporting period, as our transaction price is based on a single performance obligation consisting of a series of distinct hourly, or more frequent, periods, the variability of which will be resolved at the time of the future services. Our revenue recognition pattern under ASC 606 is materially equivalent to revenue recognition under the previous guidance. For the three and six months ended June 30, 2018 , there were no material effects to our Condensed Consolidated Balance Sheets, Condensed Consolidated Statements of Operations, or Condensed Consolidated Statements of Cash Flows. Disaggregation of Revenue The following table provides information about contract drilling revenue by rig types: Three Months Ended June 30, 2018 Six Months Ended Drillships $ 128,498 $ 240,245 Seimsubmerisibles 5,581 14,470 Jackups 113,610 222,080 Total $ 247,689 $ 476,795

Loss on Impairment

Loss on Impairment	6 Months Ended
	Jun. 30, 2018
Asset Impairment Charges [Abstract]
Loss on Impairment	Note 10— Loss on Impairment Asset Impairments We evaluate our drilling fleet assets for impairment whenever there are changes in facts which suggest that the value of the asset is not recoverable. In connection with the preparation of our financial statements for the second quarter of 2018 , we conducted a review of our fleet. The review included an assessment of certain assumptions, including future marketability of each unit in light of its current technical specifications. Assumptions used in our assessment included, but were not limited to, timing of future contract awards and expected operating dayrates, operating costs, utilization rates, capital expenditures, reactivation costs, estimated economic useful lives and, in certain cases, our belief that a drilling unit is no longer marketable and is unlikely to return to service. Based upon our impairment analysis, we impaired the carrying values to estimated fair values for the Noble Bully I, Noble Paul Romano, Noble Dave Beard and certain capital spare equipment. During the three and six months ended June 30, 2018 , impairment charges related to these units and certain capital spare equipment were approximately $763.7 million and $29.1 million , respectively. For our impaired units, we estimated the fair values of these units by applying the income valuation approach utilizing significant unobservable inputs, representative of a Level 3 fair value measurement. During the three and six months ended June 30, 2018 , we recognized a $550.3 million impairment on the Noble Bully I, of which $250.3 million is attributable to our joint venture partner. See “ Note 3— Consolidated Joint Ventures ” for additional information.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Note 11— Income Taxes At June 30, 2018 , the reserves for uncertain tax positions totaled $182.3 million (net of related tax benefits of $1.0 million ). At December 31, 2017 , the reserves for uncertain tax positions totaled $191.9 million (net of related tax benefits of $1.0 million ). It is reasonably possible that our existing liabilities related to our reserve for uncertain tax positions may fluctuate in the next 12 months primarily due to the completion of open audits or the expiration of statutes of limitation. However, we cannot reasonably estimate a range of changes in our existing liabilities due to various uncertainties, such as the unresolved nature of various audits. At June 30, 2018, our income tax provision included a non-cash item of $35.6 million related to the impairment of three rigs and certain capital spares. See “Note 10- Loss on Impairment” for additional information. At June 30, 2018 , our income tax provision included a non-cash item of $35.6 million related to the impairment of three rigs and certain capital spares. See “ Note 3— Consolidated Joint Ventures ” for additional information. At June 30, 2017 , our income tax provision included a non-cash, discrete item of $260.7 million as the result of an internal tax restructuring, which was implemented to reduce costs associated with the ownership of multiple legal entities, simplify the overall legal entity structure, ease deployment of cash throughout the business and consolidate operations into one centralized group of entities. The effect of this tax restructuring has been to lower current tax expense. For interim and annual reporting periods beginning after December 15, 2017 , ASU No. 2016-16 will be applied on a modified retrospective basis to improve the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. As the result of the application of this standard, we reclassified deferred charges of $149.9 million in “Other assets” and “Other liabilities” to “Retained earnings” on the accompanying Condensed Consolidated Balance Sheets. During the fourth quarter of 2017 , U.S. tax reform resulted in the write-down of our net deferred tax liabilities. In accordance with the guidance issued in Staff Accounting Bulletin No. 118, we will determine the final impact of the tax reform legislation once our 2017 U.S. tax return is completed in the third quarter of 2018 , which may result in a change to the provisional amounts that we recognized in 2017 .

Employee Benefit Plans

Employee Benefit Plans	6 Months Ended
	Jun. 30, 2018
Retirement Benefits [Abstract]
Employee Benefit Plans	Note 12— Employee Benefit Plans Pension costs include the following components for the three and six months ended June 30, 2018 and 2017 : Three Months Ended June 30, 2018 2017 Non-U.S. U.S. Non-U.S. U.S. Interest cost $ 354 $ 2,044 $ 492 $ 2,149 Return on plan assets (710 ) (2,978 ) (721 ) (2,941 ) Recognized net actuarial loss — 411 245 366 Net pension benefit cost (gain) $ (356 ) $ (523 ) $ 16 $ (426 ) Six Months Ended June 30, 2018 2017 Non-U.S. U.S. Non-U.S. U.S. Interest cost $ 819 $ 4,089 $ 970 $ 4,297 Return on plan assets (1,426 ) (5,957 ) (1,422 ) (5,882 ) Recognized net actuarial loss — 822 511 732 Net pension benefit cost (gain) $ (607 ) $ (1,046 ) $ 59 $ (853 ) During the three and six months ended June 30, 2018 , we made no contributions to our pension plans. During the three and six months ended June 30, 2017 , we made contributions to our pension plans totaling approximately $0.2 million . Effective December 31, 2016 , employees and alternate payees accrue no future benefits under the plans and, as such, Noble recognized no service costs with the plans for the three and six months ended June 30, 2018 and 2017 . Interest cost, return on plan assets and net actuarial losses were aggregated and disclosed within “Interest income and other, net” on the Condensed Consolidated Statements of Operations. For more information refer to “ Note 2— Accounting Pronouncements .”

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	6 Months Ended
	Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities	Note 13— Derivative Instruments and Hedging Activities We periodically enter into derivative instruments to manage our exposure to fluctuations in interest rates and foreign currency exchange rates. We have documented policies and procedures to monitor and control the use of derivative instruments. We do not engage in derivative transactions for speculative or trading purposes, nor are we a party to leveraged derivatives. For foreign currency forward contracts, hedge effectiveness is evaluated at inception based on the matching of critical terms between derivative contracts and the hedged item. Any change in fair value resulting from ineffectiveness is recognized immediately in earnings. On May 10, 2016 , Freeport-McMoRan Inc. (“Freeport”), Freeport-McMoRan Oil & Gas LLC and one of our subsidiaries entered into an agreement terminating the contracts on the Noble Sam Croft and the Noble Tom Madden (“FCX Settlement”), which were scheduled to end in July 2017 and November 2017 , respectively. The FCX Settlement included two contingent payments, which are further discussed below. We accounted for these contingent payments as derivative instruments that did not qualify under the FASB standards for hedge accounting treatment, and therefore, for the three and six months ended June 30, 2017 , the change in fair value was recognized as a $6.5 million and $14.4 million loss, respectively, in our Consolidated Statements of Operations. Cash Flow Hedges Several of our regional shorebases have a significant amount of their cash operating expenses payable in local currencies. To limit the potential risk of currency fluctuations, we periodically enter into forward contracts, which have historically settled monthly in the operations’ respective local currencies. All of these contracts had a maturity of less than 12 months. There were no foreign currency forward contracts entered into or outstanding as of June 30, 2018 . FCX Settlement Pursuant to the FCX Settlement, Noble could have received contingent payments from the FCX Settlement on September 30, 2017 , depending on the average price of oil over a 12 -month period from June 30, 2016 through June 30, 2017 . The average price of oil was calculated using the daily closing price of West Texas Intermediate crude oil (“WTI”) (CL1) on the New York Mercantile Exchange for the period of June 30, 2016 through June 30, 2017 . If the price of WTI averaged more than $50 per barrel during such period, Freeport would have paid $25.0 million to Noble. In addition to the $25.0 million contingent payment, if the price of WTI averaged more than $65 per barrel during such period, Freeport would have paid an additional $50.0 million to Noble. These contingent payments did not qualify for hedge accounting treatment under FASB standards, and therefore, the change in fair value was recognized as a loss in our Consolidated Statements of Operations. These contingent payments are referred to as non-designated derivatives in the following tables. The price of WTI did not average more than $50 per barrel during the 12-month period. As of June 30, 2017 , the fair value of these contingent payments was reduced to zero , as the period for earning the contingent payments had ended. Financial Statement Presentation The following tables summarize the recognized gains and losses, which are estimated fair value measurements, of cash flow hedges and non-designated derivatives through AOCI or as “Contract drilling services” revenue or costs for the three and six months ended June 30, 2017 : Three Months Ended June 30, 2017 Unrealized loss recognized through AOCI Loss reclassified from AOCI to "Contract drilling services" costs Loss recognized through “ Contract drilling services ” revenue Cash flow hedges Foreign currency forward contracts $ 849 $ 210 $ — Non-designated derivatives FCX Settlement $ — $ — $ (6,500 ) Six Months Ended June 30, 2017 Unrealized loss recognized through AOCI Loss reclassified from AOCI to "Contract drilling services" costs Loss recognized through “ Contract drilling services ” revenue Cash flow hedges Foreign currency forward contracts $ 739 $ — $ 137 Non-designated derivatives FCX Settlement $ — $ — $ (14,400 ) There were no foreign currency forward contracts outstanding or entered into during the three and six months ended June 30, 2018 .

Fair Value of Financial Instrum

Fair Value of Financial Instruments	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Note 14— Fair Value of Financial Instruments The following tables present the carrying amount and estimated fair value of our financial instruments recognized at fair value on a recurring basis: June 30, 2018 Estimated Fair Value Measurements Carrying Amount Quoted Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets - Marketable securities $ 7,491 $ 7,491 $ — $ — December 31, 2017 Estimated Fair Value Measurements Carrying Amount Quoted Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets - Marketable securities $ 7,321 $ 7,321 $ — $ — Our cash and cash equivalents, accounts receivable, marketable securities and accounts payable are by their nature short-term. As a result, the carrying values included in the accompanying Condensed Consolidated Balance Sheets approximate fair value.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 15— Commitments and Contingencies Transocean Ltd. In January 2017 , a subsidiary of Transocean Ltd. (“Transocean”) filed suit against us and certain of our subsidiaries for patent infringement in a Texas federal court. The suit claims that five of our newbuild rigs that operated in the U.S. Gulf of Mexico violated Transocean patents relating to what is generally referred to as dual-activity drilling. We were aware of the patents, which are now expired in the United States and most other countries, when we constructed the rigs. While there is inherent risk in litigation, we do not believe that our rigs infringe the Transocean patents. The lawsuit is currently in the discovery phase and we intend to defend ourselves vigorously against this claim. Department of Justice settlement. In December 2014 , one of our subsidiaries reached a settlement with the U.S. Department of Justice (“DOJ”) regarding our former drillship, the Noble Discoverer , and the Kulluk, a rig we were providing contract labor services for, in respect of violations of applicable law discovered in connection with a 2012 Coast Guard inspection in Alaska and our own subsequent internal investigation. Under the terms of the agreement, the subsidiary paid $8.2 million in fines and $4.0 million in community service payments and was placed on probation for four years , with the right to petition the court for early dismissal of probation after three years . The subsidiary's motion to early terminate the plea agreement was granted and the plea agreement was terminated effective as of March 1, 2018 . We also implemented a comprehensive environmental compliance plan in connection with the settlement. Brazil commercial agent. We previously used a commercial agent in Brazil in connection with our Petróleo Brasileiro S.A. (“Petrobras”) drilling contracts. This agent represented a number of different companies in Brazil over many years, including several offshore drilling contractors. In November 2015 , this agent pled guilty in Brazil in connection with the award of a drilling contract to a competitor and implicated a Petrobras official as part of a wider investigation of Petrobras’ business practices. Following news reports relating to the agent’s involvement in the Brazil investigation in connection with his activities with other companies, we conducted a review, which was substantially completed in 2017 , of our relationship with the agent and with Petrobras. We have been in contact with the SEC, the Brazilian federal prosecutor’s office and the U.S Department of Justice about this matter. We have cooperated with these agencies and they are aware of our internal review. To our knowledge, neither the agent, nor the government authorities investigating the matter, has alleged that the agent or Noble acted improperly in connection with our contracts with Petrobras. Paragon Offshore. On August 1, 2014, Noble-UK completed the separation and spin-off of a majority of its standard specification offshore drilling business (the “Spin-off”) through a pro rata distribution of all of the ordinary shares of its wholly-owned subsidiary, Paragon Offshore, to the holders of Noble’s ordinary shares. In February 2016 , Paragon Offshore sought approval of a pre-negotiated plan of reorganization (the “Prior Plan”) by filing for voluntary relief under Chapter 11 of the United States Bankruptcy Code. As part of the Prior Plan, we entered into a settlement agreement with Paragon Offshore (the “Settlement Agreement”). The Prior Plan was rejected by the bankruptcy court in October 2016 . In April 2017 , Paragon Offshore filed a revised plan of reorganization (the “New Plan”) in its bankruptcy proceeding. Under the New Plan, Paragon Offshore no longer needed the Mexican tax bonding that Noble-UK was to provide under the Settlement Agreement. Consequently, Paragon Offshore abandoned the Settlement Agreement as part of the New Plan, and the Settlement Agreement was terminated at the time of the filing of the New Plan. On May 2, 2017 , Paragon Offshore announced that it had reached an agreement in principle with both its secured and unsecured creditors to revise the New Plan to, among other things, create and fund a $10.0 million litigation trust to pursue litigation against us. On June 7, 2017 , the revised New Plan was approved by the bankruptcy court, and Paragon Offshore emerged from bankruptcy on July 18, 2017 . On December 15, 2017 , the litigation trust filed claims relating to the Spin-off against us and certain of our current and former officers and directors in the Delaware bankruptcy court that heard Paragon Offshore’s bankruptcy. The complaint alleges claims of alleged actual and constructive fraudulent conveyance, unjust enrichment and recharacterization of intercompany notes as equity claims against Noble and claims of breach of fiduciary duty and aiding and abetting breach of fiduciary duty against the officer and director defendants. We have requested that the court dismiss the claims of breach of fiduciary duty, aiding and abetting breach of fiduciary duty and unjust enrichment, and require such claims to be arbitrated under the Master Separation Agreement (the “MSA”) entered into between Noble and Paragon Offshore at the time of the Spin-off, as well as stay the other proceedings during the pendency of the arbitration. The court has stayed discovery pending its ruling. The court has approved a litigation schedule, which, if our request for arbitration is denied and the court proceedings resume in the third quarter of 2018 , would conclude all pre-trial motions and other activity by approximately the end of the third quarter or the beginning of the fourth quarter of 2019 . We believe that Paragon Offshore, at the time of the Spin-off, was properly funded, solvent and had appropriate liquidity and that the claims brought by the litigation trust are without merit. We intend to defend ourselves vigorously. However, there is inherent risk and substantial expense in litigation, and the amount of damages the plaintiff is seeking is substantial. If any of the litigation trust’s claims are successful, or if we elect to settle any claims (in part to reduce or eliminate the ongoing cost of defending the litigation and eliminate any risk of a larger judgment against us), any damages or other amounts we would be required to or agree to pay could have a material adverse effect on our business, financial condition and results of operations. We may also establish reserves on our financial statements in advance of the conclusion of the litigation. Such reserves may be material and could have a material adverse effect on our financial condition and results of operations. Prior to the completion of the Spin-off, Noble-UK and Paragon Offshore entered into a series of agreements to effect the separation and Spin-off and govern the relationship between the parties after the Spin-off (the “Separation Agreements”), including the MSA and a Tax Sharing Agreement (the “TSA”). As part of its final bankruptcy plan, Paragon Offshore rejected the Separation Agreements. Accordingly, the indemnity obligations that Paragon Offshore potentially would have owed us under the Separation Agreements have now terminated, including indemnities arising under the MSA and the TSA in respect of obligations related to Paragon Offshore’s business that were incurred through Noble-retained entities prior to the Spin-off. Likewise, any potential indemnity obligations that we would have owed Paragon Offshore under the Separation Agreements, including those under the MSA and the TSA in respect of Noble-UK’s business that was conducted prior to the Spin-off through Paragon Offshore-retained entities, are now also extinguished. In the absence of the Separation Agreements, liabilities relating to the respective parties will be borne by the owner of the legal entity or asset at issue and neither party will look to an allocation based on the historic relationship of an entity or asset to one of the party’s business, as had been the case under the Separation Agreements. The rejection and ultimate termination of the indemnity and related obligations under the Separation Agreements resulted in a number of accounting charges and benefits during the year ended December 31, 2017 , and such termination may continue to affect us in the future as liabilities arise for which we would have been indemnified by Paragon Offshore or would have had to indemnify Paragon Offshore. We do not expect that, overall, the rejection of the Separation Agreements by Paragon Offshore will have a material adverse effect on our financial condition or liquidity. However, any loss we experience with respect to which we would have been able to secure indemnification from Paragon Offshore under one or more of the Separation Agreements could have an adverse impact on our results of operations in any period, which impact may be material depending on our results of operations during this down-cycle. Tax matters. During 2014 , the Internal Revenue Service (“IRS”) began its examination of our tax reporting in the U.S. for the taxable years ended December 31, 2010 and 2011 . The IRS examination team has completed its examination of our 2010 and 2011 U.S. tax returns and proposed adjustments and deficiencies with respect to certain items that were reported by us for the 2010 and 2011 tax year. On December 19, 2016 , we received the Revenue Agent Report (“RAR”) from the IRS. We believe that we have accurately reported all amounts in our tax returns, and have submitted administrative protests with the IRS Office of Appeals contesting the examination team’s proposed adjustments. We intend to vigorously defend our reported positions, and believe the ultimate resolution of the adjustments proposed by the IRS examination team will not have a material adverse effect on our condensed consolidated financial statements. During the third quarter of 2017 , the IRS initiated its examination of our 2012 , 2013 , 2014 and 2015 tax returns. Audit claims of approximately $48.6 million attributable to income and other business taxes have been assessed against Noble entities in Mexico. We intend to vigorously defend our reported positions, and believe the ultimate resolution of the audit claims will not have a material adverse effect on our Condensed Consolidated Financial Statements. We operate in a number of countries throughout the world and our tax returns filed in those jurisdictions are subject to review and examination by tax authorities within those jurisdictions. We recognize uncertain tax positions that we believe have a greater than 50 percent likelihood of being sustained. We cannot predict or provide assurance as to the ultimate outcome of any existing or future assessments. Other contingencies. We have entered into agreements with certain of our executive officers, as well as certain other employees. These agreements become effective upon a change of control of Noble-UK (within the meaning set forth in the agreements) or a termination of employment in connection with or in anticipation of a change of control, and remain effective for three years thereafter. These agreements provide for compensation and certain other benefits under such circumstances. We are a defendant in certain claims and litigation arising out of operations in the ordinary course of business, including personal injury claims, the resolution of which, in the opinion of management, will not be material to our financial position, results of operations or cash flows. There is inherent risk in any litigation or dispute and no assurance can be given as to the outcome of these claims.

Supplemental Financial Informat

Supplemental Financial Information	6 Months Ended
	Jun. 30, 2018
Supplemental Financial Information [Abstract]
Supplemental Financial Information	Note 16— Supplemental Financial Information Condensed Consolidated Balance Sheets Information Deferred revenues from drilling contracts totaled $98.7 million and $114.3 million at June 30, 2018 and December 31, 2017 , respectively. Such amounts are included in either “Other current liabilities” or “Other liabilities” in the accompanying Condensed Consolidated Balance Sheets, based upon our expected time of recognition. Related expenses deferred under drilling contracts totaled $59.8 million at June 30, 2018 as compared to $55.7 million at December 31, 2017 , and are included in either “Prepaid expenses and other current assets,” “Other assets” or “Property and equipment, net” in the accompanying Condensed Consolidated Balance Sheets, based upon our expected time of recognition. Condensed Consolidated Statements of Cash Flows Information Operating cash activities The net effect of changes in other assets and liabilities on cash flows from operating activities is as follows: Noble-UK Noble-Cayman Six Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Accounts receivable $ (7,533 ) $ 76,495 $ (7,533 ) $ 76,495 Other current assets 6,534 15,896 5,962 12,475 Other assets (15,049 ) (40,078 ) (12,426 ) (47,166 ) Accounts payable 1,014 (8,881 ) 993 (8,754 ) Other current liabilities (10,094 ) (19,385 ) (9,680 ) (18,293 ) Other liabilities (8,396 ) 3,903 (8,396 ) 10,747 Total net change in assets and liabilities $ (33,524 ) $ 27,950 $ (31,080 ) $ 25,504 Non-cash investing activities Additions to property and equipment, at cost for which we had accrued a corresponding liability in accounts payable as of June 30, 2018 and December 31, 2017 were $34.1 million and $25.5 million , respectively. Additions to property and equipment, at cost for which we had accrued a corresponding liability in accounts payable as of June 30, 2017 and December 31, 2016 were $23.6 million and $35.1 million , respectively.

Condensed Consolidating Financi

Condensed Consolidating Financial Information	6 Months Ended
	Jun. 30, 2018
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Consolidating Financial Information	Note 17— Condensed Consolidating Financial Information Guarantees of Registered Securities Noble-Cayman, or one or more 100 percent owned subsidiaries of Noble-Cayman, is an issuer, co-issuer or full and unconditional guarantor or otherwise obligated as of June 30, 2018 with respect to registered securities as follows (see “ Note 7— Debt ” for additional information): Issuer Notes (1) (Co-Issuer(s)) Guarantor $250 million 5.75% Senior Notes due 2018 NHIL Noble-Cayman $202 million 7.50% Senior Notes due 2019 (2) NHUS Noble-Cayman Noble Drilling Holding, LLC (“NDH” ) Noble Drilling Services 6 LLC (“NDS6”) $168 million 4.90% Senior Notes due 2020 NHIL Noble-Cayman $209 million 4.625% Senior Notes due 2021 NHIL Noble-Cayman $126 million 3.95% Senior Notes due 2022 NHIL Noble-Cayman $1 billion 7.75% Senior Notes due 2024 NHIL Noble-Cayman $450 million 7.95% Senior Notes due 2025 NHIL Noble-Cayman $400 million 6.20% Senior Notes due 2040 NHIL Noble-Cayman $400 million 6.05% Senior Notes due 2041 NHIL Noble-Cayman $500 million 5.25% Senior Notes due 2042 NHIL Noble-Cayman $400 million 8.95% Senior Notes due 2045 NHIL Noble-Cayman (1) Our 2026 Notes are excluded from this list as they are unregistered securities issued in a non-public offering. (2) In February 2018, the entire remaining principal amount of 2019 Notes were redeemed and, as a result, we have prospectively eliminated NHUS, NDH, and NDS6 as guarantors in the current year presentation of the Condensed Consolidating Financial Information. However, prior year information is presented as previously reported. The following condensed consolidating financial statements of Noble-Cayman, NHUS, NDH, NHIL, NDS6 and all other subsidiaries present investments in both consolidated and unconsolidated affiliates using the equity method of accounting. NOBLE CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEET June 30, 2018 (in thousands) (Unaudited) Noble - NHIL Other Consolidating Total ASSETS Current assets Cash and cash equivalents $ 265 $ — $ 410,407 $ — $ 410,672 Accounts receivable — — 212,229 — 212,229 Taxes receivable — — 12,811 — 12,811 Short-term notes receivable from affiliates — — 3,175,662 (3,175,662 ) — Accounts receivable from affiliates 575,456 60,945 4,569,424 (5,205,825 ) — Prepaid expenses and other current assets — — 60,628 — 60,628 Total current assets 575,721 60,945 8,441,161 (8,381,487 ) 696,340 Property and equipment, at cost — — 10,924,509 — 10,924,509 Accumulated depreciation — — (2,403,099 ) — (2,403,099 ) Property and equipment, net — — 8,521,410 — 8,521,410 Notes receivable from affiliates 3,177,249 — — (3,177,249 ) — Investments in affiliates 4,357,569 12,209,685 — (16,567,254 ) — Other assets 915 — 174,194 — 175,109 Total assets $ 8,111,454 $ 12,270,630 $ 17,136,765 $ (28,125,990 ) $ 9,392,859 LIABILITIES AND EQUITY Current liabilities Short-term notes payables to affiliates $ — $ 3,175,662 $ — $ (3,175,662 ) $ — Accounts payable 2 — 93,429 — 93,431 Accrued payroll and related costs — — 41,821 — 41,821 Accounts payable to affiliates 3,729,486 839,938 636,401 (5,205,825 ) — Taxes payable — — 33,278 — 33,278 Interest payable 262 100,517 2,628 — 103,407 Other current liabilities — — 64,928 — 64,928 Total current liabilities 3,729,750 4,116,117 872,485 (8,381,487 ) 336,865 Long-term debt — 3,842,617 — 3,842,617 Notes payable to affiliates — — 3,177,249 (3,177,249 ) — Deferred income taxes — — 155,961 — 155,961 Other liabilities 19,929 — 264,894 — 284,823 Total liabilities 3,749,679 7,958,734 4,470,589 (11,558,736 ) 4,620,266 Commitments and contingencies — Total shareholder equity 4,361,775 4,311,896 12,255,358 (16,567,254 ) 4,361,775 Noncontrolling interests — — 410,818 — 410,818 Total equity 4,361,775 4,311,896 12,666,176 (16,567,254 ) 4,772,593 Total liabilities and equity $ 8,111,454 $ 12,270,630 $ 17,136,765 $ (28,125,990 ) $ 9,392,859 NOBLE CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEET December 31, 2017 (in thousands) (Unaudited) Noble- NHUS NDH NHIL NDS6 Other Consolidating Total ASSETS Current assets Cash and cash equivalents $ 11 $ — $ 23,160 $ 29,324 $ — $ 609,516 $ — $ 662,011 Accounts receivable — — 24,722 — — 179,974 — 204,696 Taxes receivable — 93,302 3 — — 12,040 — 105,345 Short-term notes receivable from affiliates — — 119,476 — 2,373,452 — (2,492,928 ) — Accounts receivable from affiliates 594,456 1,454 144,367 60,945 465,749 5,813,846 (7,080,817 ) — Prepaid expenses and other current assets — — 1,477 — 1 63,963 — 65,441 Total current assets 594,467 94,756 313,205 90,269 2,839,202 6,679,339 (9,573,745 ) 1,037,493 Property and equipment, at cost — — 857,784 — — 11,176,547 — 12,034,331 Accumulated depreciation — — (110,005 ) — — (2,435,086 ) — (2,545,091 ) Property and equipment, net — — 747,779 — — 8,741,461 — 9,489,240 Notes receivable from affiliates 3,177,248 — 1,199,815 — 3,943,299 1,175,300 (9,495,662 ) — Investments in affiliates 4,933,978 4,550,358 5,252,135 12,560,598 7,237,474 — (34,534,543 ) — Other assets 2,663 16,775 8,372 — — 238,718 — 266,528 Total assets $ 8,708,356 $ 4,661,889 $ 7,521,306 $ 12,650,867 $ 14,019,975 $ 16,834,818 $ (53,603,950 ) $ 10,793,261 LIABILITIES AND EQUITY Current liabilities Short-term notes payables to affiliates $ — $ 1,605,243 $ — $ — $ — $ 887,685 $ (2,492,928 ) $ — Current maturities of long-term debt — — — 249,843 — — — 249,843 Accounts payable — — 1,467 — — 82,406 — 83,873 Accrued payroll and related costs — — 4,780 — — 50,124 — 54,904 Accounts payable to affiliates 3,410,669 393,073 1,770,066 661,375 — 845,634 (7,080,817 ) — Taxes payable — — — — — 33,965 — 33,965 Interest payable 2,211 — — 83,960 12,018 — — 98,189 Other current liabilities — — 5,169 — — 66,297 — 71,466 Total current liabilities 3,412,880 1,998,316 1,781,482 995,178 12,018 1,966,111 (9,573,745 ) 592,240 Long-term debt — — — 3,594,332 201,535 — — 3,795,867 Notes payable to affiliates — 700,000 474,637 3,175,663 — 5,145,362 (9,495,662 ) — Deferred income taxes — — 5 — — 164,957 — 164,962 Other liabilities 19,929 — 30,330 — — 239,919 — 290,178 Total liabilities 3,432,809 2,698,316 2,286,454 7,765,173 213,553 7,516,349 (19,069,407 ) 4,843,247 Commitments and contingencies Total shareholder equity 5,275,547 1,963,573 5,234,852 4,885,694 13,806,422 8,644,002 (34,534,543 ) 5,275,547 Noncontrolling interests — — — — — 674,467 — 674,467 Total equity 5,275,547 1,963,573 5,234,852 4,885,694 13,806,422 9,318,469 (34,534,543 ) 5,950,014 Total liabilities and equity $ 8,708,356 $ 4,661,889 $ 7,521,306 $ 12,650,867 $ 14,019,975 $ 16,834,818 $ (53,603,950 ) $ 10,793,261 NOBLE CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS and COMPREHENSIVE INCOME (LOSS) Three Months Ended June 30, 2018 (in thousands) (Unaudited) Noble- NHIL Other Consolidating Total Operating revenues Contract drilling services $ — $ — $ 247,689 $ — $ 247,689 Reimbursables and other — — 10,680 — 10,680 Total operating revenues — — 258,369 — 258,369 Operating costs and expenses Contract drilling services 74 793 149,881 — 150,748 Reimbursables — — 8,297 — 8,297 Depreciation and amortization — — 128,173 — 128,173 General and administrative 32 565 7,524 — 8,121 Loss on impairment — — 792,843 — 792,843 Total operating costs and expenses 106 1,358 1,086,718 — 1,088,182 Operating loss (106 ) (1,358 ) (828,349 ) — (829,813 ) Other income (expense) Income (loss) of unconsolidated affiliates (613,855 ) (363,431 ) — 977,286 — Interest expense (15 ) (105,771 ) (11,889 ) 43,545 (74,130 ) Interest income and other, net 1,586 (2 ) 44,812 (43,545 ) 2,851 Income (loss) before income taxes (612,390 ) (470,562 ) (795,426 ) 977,286 (901,092 ) Income tax benefit — — 38,733 — 38,733 Net income (loss) (612,390 ) (470,562 ) (756,693 ) 977,286 (862,359 ) Net income attributable to noncontrolling interests — — 249,969 — 249,969 Net income (loss) attributable to Noble Corporation (612,390 ) (470,562 ) (506,724 ) 977,286 (612,390 ) Other comprehensive income (loss), net (2,446 ) — (2,446 ) 2,446 (2,446 ) Comprehensive income (loss) attributable to Noble Corporation $ (614,836 ) $ (470,562 ) $ (509,170 ) $ 979,732 $ (614,836 ) NOBLE CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS and COMPREHENSIVE INCOME (LOSS) Six Months Ended June 30, 2018 (in thousands) (Unaudited) Noble- NHIL Other Consolidating Total Operating revenues Contract drilling services $ — $ — $ 476,795 $ — $ 476,795 Reimbursables and other — — 16,731 — 16,731 Total operating revenues — — 493,526 — 493,526 Operating costs and expenses Contract drilling services 155 1,397 285,603 — 287,155 Reimbursables — — 12,647 — 12,647 Depreciation and amortization — — 255,812 — 255,812 General and administrative 65 1,183 20,330 — 21,578 Loss on impairment — — 792,843 — 792,843 Total operating costs and expenses 220 2,580 1,367,235 — 1,370,035 Operating loss (220 ) (2,580 ) (873,709 ) — (876,509 ) Other income (expense) Income (loss) of unconsolidated affiliates (744,671 ) (350,913 ) — 1,095,584 — Interest expense (460 ) (225,592 ) (11,889 ) 87,796 (150,145 ) Gain (loss) on extinguishment of debt, net (2,336 ) 5,419 (11,851 ) — (8,768 ) Interest income and other, net 3,154 (131 ) 88,970 (87,796 ) 4,197 Income (loss) before income taxes (744,533 ) (573,797 ) (808,479 ) 1,095,584 (1,031,225 ) Income tax benefit — — 35,737 — 35,737 Net income (loss) (744,533 ) (573,797 ) (772,742 ) 1,095,584 (995,488 ) Net income attributable to noncontrolling interests — — 250,955 — 250,955 Net income (loss) attributable to Noble Corporation (744,533 ) (573,797 ) (521,787 ) 1,095,584 (744,533 ) Other comprehensive income (loss), net (1,455 ) — (1,455 ) 1,455 (1,455 ) Comprehensive income (loss) attributable to Noble Corporation $ (745,988 ) $ (573,797 ) $ (523,242 ) $ 1,097,039 $ (745,988 ) NOBLE CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENT OF INCOME and COMPREHENSIVE INCOME (LOSS) Three Months Ended June 30, 2017 (in thousands) (Unaudited) Noble- NHUS NDH NHIL NDS6 Other Consolidating Total Operating revenues Contract drilling services $ — $ — $ 39,988 $ — $ — $ 241,488 $ (9,944 ) $ 271,532 Reimbursables and other — — 892 — — 5,718 — 6,610 Total operating revenues — — 40,880 — — 247,206 (9,944 ) 278,142 Operating costs and expenses Contract drilling services (866 ) 3,362 12,687 (10,834 ) — 167,862 (9,944 ) 162,267 Reimbursables — — 472 — — 3,922 — 4,394 Depreciation and amortization — — 14,005 — — 120,628 — 134,633 General and administrative (442 ) 1,538 — (5,941 ) 5 18,071 — 13,231 Total operating costs and expenses (1,308 ) 4,900 27,164 (16,775 ) 5 310,483 (9,944 ) 314,525 Operating income (loss) 1,308 (4,900 ) 13,716 16,775 (5 ) (63,277 ) — (36,383 ) Other income (expense) Income (loss) of unconsolidated affiliates (85,274 ) (99,354 ) 39,114 48,476 5,647 — 91,391 — Income (loss) of unconsolidated affiliates - discontinued operations, net of tax 2,967 4,566 — — — — (7,533 ) — Interest expense (2,578 ) (6,345 ) (3,291 ) (107,686 ) (3,854 ) (23,134 ) 73,679 (73,209 ) Interest income and other, net 2,646 (26 ) 14,309 720 53,560 5,608 (73,679 ) 3,138 Income (loss) from continuing operations before income taxes (80,931 ) (106,059 ) 63,848 (41,715 ) 55,348 (80,803 ) 83,858 (106,454 ) Income tax benefit (provision) — 66,127 (835 ) — — (47,079 ) — 18,213 Net income (loss) from continuing operations (80,931 ) (39,932 ) 63,013 (41,715 ) 55,348 (127,882 ) 83,858 (88,241 ) Net income (loss) from discontinuing operations, net of tax (1,598 ) — — — 4,565 — 2,967 Net Income (loss) (80,931 ) (41,530 ) 63,013 (41,715 ) 55,348 (123,317 ) 83,858 (85,274 ) Net (income) loss attributable to noncontrolling interests — — — — — 4,821 (478 ) 4,343 Net income (loss) attributable to Noble Corporation (80,931 ) (41,530 ) 63,013 (41,715 ) 55,348 (118,496 ) 83,380 (80,931 ) Other comprehensive income (loss), net 1,318 — — — — 1,318 (1,318 ) 1,318 Comprehensive income (loss) attributable to Noble Corporation $ (79,613 ) $ (41,530 ) $ 63,013 $ (41,715 ) $ 55,348 $ (117,178 ) $ 82,062 $ (79,613 ) NOBLE CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENT OF INCOME and COMPREHENSIVE INCOME (LOSS) Six Months Ended June 30, 2017 (in thousands) (Unaudited) Noble- NHUS NDH NHIL NDS6 Other Consolidating Total Operating revenues Contract drilling services $ — $ — $ 87,092 $ — $ — $ 566,212 $ (27,113 ) $ 626,191 Reimbursables and other — — 2,028 — — 12,899 — 14,927 Total operating revenues — — 89,120 — — 579,111 (27,113 ) 641,118 Operating costs and expenses Contract drilling services 135 5,933 24,186 1,653 — 317,873 (27,113 ) 322,667 Reimbursables — — 1,292 — — 8,248 — 9,540 Depreciation and amortization — — 30,520 — — 239,831 — 270,351 General and administrative 71 2,845 — 892 9 18,478 — 22,295 Total operating costs and expenses 206 8,778 55,998 2,545 9 584,430 (27,113 ) 624,853 Operating income (loss) (206 ) (8,778 ) 33,122 (2,545 ) (9 ) (5,319 ) — 16,265 Other income (expense) Income (loss) of unconsolidated affiliates (380,376 ) (412,919 ) 41,483 145,293 56,266 — 550,253 — Income (loss) of unconsolidated affiliates - discontinued operations, net of tax 2,967 4,566 — — — — (7,533 ) — Interest expense (5,183 ) (23,856 ) (6,383 ) (213,688 ) (7,671 ) (80,447 ) 190,572 (146,656 ) Interest income and other, net 7,278 (91 ) 54,211 4,923 116,978 11,914 (190,572 ) 4,641 Income (loss) from continuing operations before income taxes (375,520 ) (441,078 ) 122,433 (66,017 ) 165,564 (73,852 ) 542,720 (125,750 ) Income tax benefit (provision) — 116,586 (326 ) — — (355,420 ) — (239,160 ) Net income (loss) from continuing operations (375,520 ) (324,492 ) 122,107 (66,017 ) 165,564 (429,272 ) 542,720 (364,910 ) Net income (loss) from discontinuing operations, net of tax — (1,598 ) — — — 4,565 — 2,967 Net Income (loss) (375,520 ) (326,090 ) 122,107 (66,017 ) 165,564 (424,707 ) 542,720 (361,943 ) Net income attributable to noncontrolling interests — — — — — (12,761 ) (816 ) (13,577 ) Net income (loss) attributable to Noble Corporation (375,520 ) (326,090 ) 122,107 (66,017 ) 165,564 (437,468 ) 541,904 (375,520 ) Other comprehensive income (loss), net 1,786 — — — — 1,786 (1,786 ) 1,786 Comprehensive income (loss) attributable to Noble Corporation $ (373,734 ) $ (326,090 ) $ 122,107 $ (66,017 ) $ 165,564 $ (435,682 ) $ 540,118 $ (373,734 ) NOBLE CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS Six Months Ended June 30, 2018 (in thousands) (Unaudited) Noble- NHIL Other Consolidating Total Cash flows from operating activities Net cash provided by (used in) operating activities $ 15,220 $ (206,481 ) $ 270,815 $ — $ 79,554 Cash flows from investing activities Capital expenditures — — (75,874 ) — (75,874 ) Proceeds from disposal of assets — — 3,755 — 3,755 Net cash used in investing activities — — (72,119 ) — (72,119 ) Cash flows from financing activities Issuance of senior notes — 750,000 — — 750,000 Repayment of long-term debt — (738,555 ) (213,654 ) — (952,209 ) Debt issuance costs on senior notes and credit facility (822 ) (12,581 ) (1,399 ) — (14,802 ) Dividends paid to noncontrolling interests — — (12,694 ) — (12,694 ) Distributions to parent company, net (29,069 ) — — — (29,069 ) Advances (to) from affiliates 14,925 178,293 (193,218 ) — — Net cash provided by (used in) financing activities (14,966 ) 177,157 (420,965 ) — (258,774 ) Net change in cash and cash equivalents 254 (29,324 ) (222,269 ) — (251,339 ) Cash and cash equivalents, beginning of period 11 29,324 632,676 — 662,011 Cash and cash equivalents, end of period $ 265 $ — $ 410,407 $ — $ 410,672 NOBLE CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS Six Months Ended June 30, 2017 (in thousands) (Unaudited) Noble- NHUS NDH NHIL NDS6 Other Consolidating Total Cash flows from operating activities Net cash provided by (used in) operating activities $ 18,027 $ 128,277 $ 94,821 $ (173,014 ) $ 109,339 $ 91,919 $ — $ 269,369 Cash flows from investing activities Capital expenditures — — (1,309 ) — — (66,299 ) — (67,608 ) Proceeds from disposal of assets — — 7 — — 307 — 314 Net cash used in investing activities — — (1,302 ) — — (65,992 ) — (67,294 ) Cash flows from financing activities Repayment of long-term debt — — — (300,000 ) — — — (300,000 ) Debt issuance costs on senior notes and credit facilities — — — (42 ) — — — (42 ) Dividends paid to noncontrolling interests — — — — — (5,393 ) — (5,393 ) Contributions from parent company, net 51,705 — — — — — — 51,705 Advances (to) from affiliates (72,255 ) (128,277 ) (104,255 ) 473,423 (109,339 ) (59,297 ) — — Net cash provided by (used in) financing activities (20,550 ) (128,277 ) (104,255 ) 173,381 (109,339 ) (64,690 ) — (253,730 ) Net change in cash and cash equivalents (2,523 ) — (10,736 ) 367 — (38,763 ) — (51,655 ) Cash and cash equivalents, beginning of period 2,537 — 10,855 — — 640,441 — 653,833 Cash and cash equivalents, end of period $ 14 $ — $ 119 $ 367 $ — $ 601,678 $ — $ 602,178

Organization and Basis of Pre26

Organization and Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Consolidation	The accompanying unaudited condensed consolidated financial statements of Noble-UK and Noble-Cayman have been prepared pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) as they pertain to Quarterly Reports on Form 10-Q. Accordingly, certain information and disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted pursuant to such rules and regulations. The unaudited financial statements reflect all adjustments which are, in the opinion of management, necessary for a fair statement of the financial position and results of operations for the interim periods, on a basis consistent with the annual audited consolidated financial statements. All such adjustments are of a recurring nature. The December 31, 2017 Condensed Consolidated Balance Sheets presented herein are derived from the December 31, 2017 audited consolidated financial statements. These interim financial statements should be read in conjunction with the consolidated financial statements and notes included in our Annual Report on Form 10-K for the year ended December 31, 2017 , filed by both Noble-UK and Noble-Cayman. The results of operations for interim periods are not necessarily indicative of the results to be expected for the full year.
New Accounting Pronouncements	Accounting Standards Adopted In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-9, which creates Accounting Standards Codification (“ASC”) Topic 606, “Revenue from Contracts with Customers,” and supersedes the revenue recognition requirements in Topic 605, “Revenue Recognition,” including most industry-specific revenue recognition guidance throughout the Industry Topics of the Codification. In addition, ASU No. 2014-9 supersedes the cost guidance in Subtopic 605-35, “Revenue Recognition—Construction-Type and Production-Type Contracts,” and creates new Subtopic 340-40, “Other Assets and Deferred Costs—Contracts with Customers.” Under the new guidance, revenue is recognized when a customer obtains control of promised goods or services and in an amount that reflects the consideration the entity expects to receive in exchange for those goods or services. We adopted ASU 2014-09 and its related amendments, or collectively Topic 606, effective January 1, 2018 using the modified retrospective implementation method. Accordingly, we have applied the five-step method outlined in Topic 606 for determining when and how revenue is recognized to all contracts that were not completed as of the date of adoption. Revenues for reporting periods beginning after January 1, 2018 are presented under Topic 606, while prior period amounts have not been adjusted and continue to be reported under the previous revenue recognition guidance. For contracts that were modified before the effective date, we have considered the modification guidance within the new standard and determined that the revenue recognized and contract balances recorded prior to adoption for such contracts were not impacted. While Topic 606 requires additional disclosure of the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers, its adoption has not had a material impact on the measurement or recognition of our revenues. Our modified retrospective adoption, for which we were not required to make any material changes to the prior year presentation, did not have a material effect on our condensed consolidated financial statements. In October 2016, the FASB issued ASU No. 2016-16, which amends ASC Topic 740, “Income Taxes.” The amendments in this update improve the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. This standard is effective for interim and annual reporting periods beginning after December 15, 2017. We have adopted the new standard effective January 1, 2018 under the modified retrospective approach. Accordingly, “Other Assets” is reduced in our Condensed Consolidated Balance Sheet with a cumulative adjustment to retained earnings of approximately $149.9 million . In February 2018 , the FASB issued ASU No. 2018-2, which amends ASC Topic 220, “Income Statement—Reporting Comprehensive Income.” The amendments in this update allow for a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act (the “Act”). This standard is effective for interim and annual reporting periods beginning after December 15, 2018 with early application permitted. We have elected to adopt the new standard effective January 1, 2018 under the modified retrospective approach. The amendment should be applied on a retrospective basis to each period in which the effect of the change in the U.S. federal corporate income tax rate in the Act was recognized. As a result of the retrospective application, we will reduce “Accumulated Other Comprehensive Income” in our Condensed Consolidated Balance Sheet with a cumulative adjustment to “Retained Earnings” of approximately $5.5 million . In March 2017, the FASB issued ASU No. 2017-7, which amends ASC Topic 715, “Compensation —Retirement Benefits; Improving the Presentation of Net Periodic Pension Cost and Postretirement Benefits Cost.” The amendments in this update require that an employer disaggregate the service cost component from the other components of net benefit cost for an entity's defined benefit pension and other postretirement plans. The amendments also provide explicit guidance on how to present the service cost component and the other components of net benefit cost in the income statement and allow only the service cost component of net benefit cost to be eligible for capitalization. The amendments in this update require that an employer report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit costs, as defined in paragraphs 715-30-35-4 and 715-60-35-9, are required to be presented in the income statement separately from the service cost component and outside of income from operations. We adopted ASU No. 2017-7 effective January 1, 2018 and accordingly, we have made certain reclassifications between our “Contract drilling services” costs and “Interest income and other, net” on our Condensed Consolidated Statement of Operations. Issued Accounting Standards In February 2016, the FASB issued ASU No. 2016-2, which creates ASC Topic 842, “Leases.” This standard is effective for interim and annual reporting periods beginning after December 15, 2018 . We expect to adopt, on a modified retrospective basis, ASC 842 effective January 1, 2019 . Our adoption requires that, as lessees, we recognize a right to use asset and lease liability. In addition, as lessors, our drilling contracts contain a lease component, which requires revenue presentation analysis. The ultimate effect on our consolidated financial statements, will be based on an evaluation of the contract-specific facts and circumstances. We do not expect our adoption to materially affect our Condensed Consolidated Balance Sheet, Condensed Consolidated Statement of Operations, or Condensed Consolidated Statement of Cash Flows. We are currently evaluating what other effect, if any, ASC 842 will have on our condensed consolidated financial statements and related disclosures. With the exception of the updated standards discussed above, there have been no new accounting pronouncements not yet effective that have significance, or potential significance, to our condensed consolidated financial statements.
Revenue	Dayrate Drilling Revenue. Our drilling contracts generally provide for payment on a dayrate basis, with higher rates for periods when the drilling unit is operating and lower rates or zero rates for periods when drilling operations are interrupted or restricted. The dayrate invoices billed to the customer are typically determined based on the varying rates applicable to the specific activities performed on an hourly basis. Such dayrate consideration is allocated to the distinct hourly increment it relates to within the contract term, and therefore, recognized in line with the contractual rate billed for the services provided for any given hour. Mobilization/Demobilization Revenue. We may receive fees (on either a fixed lump-sum or variable dayrate basis) for the mobilization and demobilization of our rigs. These activities are not considered to be distinct within the context of the contract and, therefore, the associated revenue is allocated to the overall performance obligation and the associated pre-operating costs are deferred. We record a contract liability for mobilization fees received and a deferred asset for costs. Both revenue and pre-operating costs are recognized ratably over the initial term of the related drilling contract. In most contracts, there is uncertainty as to the amount of expected demobilization revenue due to contractual provisions that stipulate that certain conditions must be present at contract completion for such revenue to be received and as to the amount thereof, if any. For example, contractual provisions may require that a rig demobilize a certain distance before the demobilization revenue is payable or the amount may vary dependent upon whether or not the rig has additional contracted work within a certain distance from the wellsite. Therefore, the estimate for such revenue may be constrained, as described earlier, depending on the facts and circumstances pertaining to the specific contract. We assess the likelihood of receiving such revenue based on past experience and knowledge of the market conditions. In cases where demobilization revenue is expected to be received upon contract completion, it is estimated as part of the overall transaction price at contract inception and recognized in earnings ratably over the initial term of the contract with an offset to an accretive contract asset. Contract Preparation Revenue. Some of our drilling contracts require downtime before the start of the contract to prepare the rig to meet customer requirements. At times, we may be compensated by the customer for such work (on either a fixed lump-sum or variable dayrate basis). These activities are not considered to be distinct within the context of the contract and, therefore, the related revenue is allocated to the overall performance obligation and recognized ratably over the initial term of the related drilling contract. We record a contract liability for contract preparation fees received, which is amortized ratably to contract drilling revenue over the initial term of the related drilling contract. Bonuses, Penalties and Other Variable Consideration. We may receive bonus increases to revenue or penalty decreases to revenue. Based on historical data, and ongoing communication with the operator/customer, we are able to reasonably estimate this variable consideration. We will record such estimated variable consideration and re-measure our estimates at each reporting date. For revenue estimated, but not received, we will record to “Prepaid expenses and other current assets” on our Condensed Consolidated Balance Sheets. Capital Modification Revenue . From time to time, we may receive fees from our customers for capital improvements to our rigs to meet contractual requirements (on either a fixed lump-sum or variable dayrate basis). Such revenue is allocated to the overall performance obligation and recognized ratably over the initial term of the related drilling contract as these activities are integral to our drilling activities and are not considered to be a stand-alone service provided to the customer within the context of our contracts. We record a contract liability for such fees and recognize them ratably as contract drilling revenue over the initial term of the related drilling contract. Revenues Related to Reimbursable Expenses . We generally receive reimbursements from our customers for the purchase of supplies, equipment, personnel services and other services provided at their request in accordance with a drilling contract or other agreement. Such reimbursable revenue is variable and subject to uncertainty, as the amounts received and timing thereof is highly dependent on factors outside of our influence. Accordingly, reimbursable revenue is constrained revenue and not included in the total transaction price until the uncertainty is resolved, which typically occurs when the related costs are incurred on behalf of a customer. We are generally considered a principal in such transactions and record the associated revenue at the gross amount billed to the customer as “Revenues related to reimbursable expenses” in our Condensed Consolidated Statements of Operations. Such amounts are recognized ratably over the period within the contract term, during which the corresponding goods and services are to be consumed.
Contract Balances	Contract Balances Accounts receivable are recognized when the right to consideration becomes unconditional based upon contractual billing schedules. Payment terms on invoiced amounts are typically 30 days. Current contract asset and liability balances are included in “prepaid expenses and other current assets” and “other current liabilities,” respectively, and noncurrent contract assets and liabilities are included in “other assets” and “other liabilities,” respectively, on our Condensed Consolidated Balance Sheets.

Loss Per Share (Tables)

Loss Per Share (Tables)	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings Per Share for Noble-UK	The following table presents the computation of basic and diluted earnings per share for Noble-UK: Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Numerator: Basic Net loss from continuing operations $ (628,063 ) $ (91,864 ) $ (770,397 ) $ (393,558 ) Net loss from discontinued operations, net of tax — (1,486 ) — (1,486 ) Net loss attributable to Noble Corporation plc $ (628,063 ) $ (93,350 ) $ (770,397 ) $ (395,044 ) Diluted Net loss from continuing operations $ (628,063 ) $ (91,864 ) $ (770,397 ) $ (393,558 ) Net loss from discontinued operations, net of tax — (1,486 ) — (1,486 ) Net loss attributable to Noble Corporation plc $ (628,063 ) $ (93,350 ) $ (770,397 ) $ (395,044 ) Denominator: Weighted average shares outstanding - basic 246,740 244,828 246,438 244,527 Weighted average shares outstanding - diluted 246,740 244,828 246,438 244,527 Loss per share Basic: Loss from continuing operations $ (2.55 ) $ (0.37 ) $ (3.13 ) $ (1.61 ) Loss from discontinued operations — (0.01 ) — (0.01 ) Net loss attributable to Noble Corporation plc $ (2.55 ) $ (0.38 ) $ (3.13 ) $ (1.62 ) Diluted: Loss from continuing operations $ (2.55 ) $ (0.37 ) $ (3.13 ) $ (1.61 ) Loss from discontinued operations — (0.01 ) — (0.01 ) Net loss attributable to Noble Corporation plc $ (2.55 ) $ (0.38 ) $ (3.13 ) $ (1.62 )

Property and Equipment (Tables)

Property and Equipment (Tables)	6 Months Ended
	Jun. 30, 2018
Property, Plant and Equipment [Abstract]
Property and Equipment, at Cost	Property and equipment, at cost, for Noble-UK consisted of the following: June 30, 2018 December 31, 2017 Drilling equipment and facilities $ 10,610,440 $ 11,746,629 Construction in progress 111,304 83,509 Other 202,765 204,193 Property and equipment, at cost $ 10,924,509 $ 12,034,331

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Estimated Fair Value of Our Long-Term Debt, not Including Effect of Unamortized Debt Issuance Costs	The following table presents the carrying value, net of unamortized debt issuance costs and discounts, and the estimated fair value of our total debt, not including the effect of unamortized debt issuance costs, respectively: June 30, 2018 December 31, 2017 Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Senior unsecured notes: 5.75% Senior Notes due March 2018 $ — $ — $ 249,843 $ 250,830 7.50% Senior Notes due March 2019 — — 201,535 206,881 4.90% Senior Notes due August 2020 65,786 64,773 167,422 163,283 4.625% Senior Notes due March 2021 92,865 89,655 208,095 195,687 3.95% Senior Notes due March 2022 41,606 38,170 125,307 107,348 7.75% Senior Notes due January 2024 782,057 760,838 971,498 861,160 7.95% Senior Notes due April 2025 446,308 416,727 446,106 380,732 7.875% Senior Notes due February 2026 737,900 772,695 — — 6.20% Senior Notes due August 2040 396,771 291,504 396,738 274,988 6.05% Senior Notes due March 2041 394,569 288,936 394,514 273,988 5.25% Senior Notes due March 2042 494,125 341,250 494,063 315,430 8.95% Senior Notes due April 2045 390,630 358,760 390,589 320,396 Total debt 3,842,617 3,423,308 4,045,710 3,350,723 Current maturities of long-term debt — — 249,843 250,830 Long-term debt $ 3,842,617 $ 3,423,308 $ 3,795,867 $ 3,099,893

Accumulated Other Comprehensi30

Accumulated Other Comprehensive Income (Loss) (Tables)	6 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Changes in Accumulated Balances for Components of AOCI	The following table presents the changes in the accumulated balances for each component of AOCI for the six months ended June 30, 2018 and 2017 . All amounts within the table are shown net of tax. Unrealized Losses on Cash Flow Hedges (1) Defined Benefit Pension Items (2) Foreign Currency Items Total Balance at December 31, 2016 $ — $ (35,865 ) $ (16,275 ) $ (52,140 ) Activity during period: Other comprehensive income before reclassifications 739 — 280 1,019 Amounts reclassified from AOCI — 767 — 767 Net other comprehensive income 739 767 280 1,786 Balance at June 30, 2017 $ 739 $ (35,098 ) $ (15,995 ) $ (50,354 ) Balance at December 31, 2017 $ — $ (27,603 ) $ (15,285 ) $ (42,888 ) Activity during period: Stranded tax effect resulting from the Act (Note 2) — (5,540 ) — (5,540 ) Balance at January 1, 2018 — (33,143 ) (15,285 ) (48,428 ) Activity during period: Other comprehensive loss before reclassifications — — (2,104 ) (2,104 ) Amounts reclassified from AOCI — 649 — 649 Net other comprehensive income (loss) — 649 (2,104 ) (1,455 ) Balance at June 30, 2018 $ — $ (32,494 ) $ (17,389 ) $ (49,883 ) (1) Unrealized losses on cash flow hedges are related to foreign currency forward contracts. Reclassifications from AOCI are recognized through “Contract drilling services” costs on our Condensed Consolidated Statements of Operations. See “ Note 13— Derivative Instruments and Hedging Activities ” for additional information. (2) Defined benefit pension items relate to actuarial changes. Reclassifications from AOCI are recognized as expense on our Condensed Consolidated Statements of Operations through either “Contract drilling services” or “General and administrative.” See “ Note 12— Employee Benefit Plans ” for additional information.

Revenue and Customers (Tables)

Revenue and Customers (Tables)	6 Months Ended
	Jun. 30, 2018
Revenue from Contract with Customer [Abstract]
Contract with Customer, Asset and Liability	The following table provides information about contract assets and contract liabilities from contracts with customers: June 30, 2018 January 1, 2018 Current contract assets $ 28,207 $ 21,229 Noncurrent contract assets 31,551 34,520 Total contract assets 59,758 55,749 Current contract liabilities (deferred revenue) (38,074 ) (35,422 ) Noncurrent contract liabilities (deferred revenue) (60,602 ) (73,439 ) Total contract liabilities $ (98,676 ) $ (108,861 ) Significant changes in the remaining performance obligation contract assets and the contract liabilities balances for the six months ended June 30, 2018 are as follows: Contract Assets Contract Liabilities Net balance at January 1, 2018 $ 55,749 $ (108,861 ) Amortization of deferred costs (13,684 ) — Additions to deferred costs 17,693 — Amortization of deferred revenue — 21,597 Additions to deferred revenue — (11,412 ) Total 4,009 10,185 Net balance at June 30, 2018 $ 59,758 $ (98,676 )
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction	The following table reflects revenue expected to be recognized in the future related to unsatisfied performance obligations, by rig type, at the end of the reporting period: Six Months Ended 2018 2019 2020 2021 2022 and beyond Total Drillships $ 15,207 $ 16,963 $ 15,657 $ 15,657 $ 12,826 $ 76,310 Jackups 8,076 10,622 3,668 — — 22,366 Total (1) $ 23,283 $ 27,585 $ 19,325 $ 15,657 $ 12,826 $ 98,676 (1) Our Semisubmersible fleet contained no unsatisfied performance obligations as of June 30, 2018 .
Disaggregation of revenue by rig types	The following table provides information about contract drilling revenue by rig types: Three Months Ended June 30, 2018 Six Months Ended Drillships $ 128,498 $ 240,245 Seimsubmerisibles 5,581 14,470 Jackups 113,610 222,080 Total $ 247,689 $ 476,795

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	6 Months Ended
	Jun. 30, 2018
Retirement Benefits [Abstract]
Pension Costs	Pension costs include the following components for the three and six months ended June 30, 2018 and 2017 : Three Months Ended June 30, 2018 2017 Non-U.S. U.S. Non-U.S. U.S. Interest cost $ 354 $ 2,044 $ 492 $ 2,149 Return on plan assets (710 ) (2,978 ) (721 ) (2,941 ) Recognized net actuarial loss — 411 245 366 Net pension benefit cost (gain) $ (356 ) $ (523 ) $ 16 $ (426 ) Six Months Ended June 30, 2018 2017 Non-U.S. U.S. Non-U.S. U.S. Interest cost $ 819 $ 4,089 $ 970 $ 4,297 Return on plan assets (1,426 ) (5,957 ) (1,422 ) (5,882 ) Recognized net actuarial loss — 822 511 732 Net pension benefit cost (gain) $ (607 ) $ (1,046 ) $ 59 $ (853 )

Derivative Instruments and He33

Derivative Instruments and Hedging Activities (Tables)	6 Months Ended
	Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summarization of Recognized Gains and Losses of Cash Flow Hedges	The following tables summarize the recognized gains and losses, which are estimated fair value measurements, of cash flow hedges and non-designated derivatives through AOCI or as “Contract drilling services” revenue or costs for the three and six months ended June 30, 2017 : Three Months Ended June 30, 2017 Unrealized loss recognized through AOCI Loss reclassified from AOCI to "Contract drilling services" costs Loss recognized through “ Contract drilling services ” revenue Cash flow hedges Foreign currency forward contracts $ 849 $ 210 $ — Non-designated derivatives FCX Settlement $ — $ — $ (6,500 ) Six Months Ended June 30, 2017 Unrealized loss recognized through AOCI Loss reclassified from AOCI to "Contract drilling services" costs Loss recognized through “ Contract drilling services ” revenue Cash flow hedges Foreign currency forward contracts $ 739 $ — $ 137 Non-designated derivatives FCX Settlement $ — $ — $ (14,400 )

Fair Value of Financial Instr34

Fair Value of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Carrying Amount and Estimated Fair Value of Financial Instruments	The following tables present the carrying amount and estimated fair value of our financial instruments recognized at fair value on a recurring basis: June 30, 2018 Estimated Fair Value Measurements Carrying Amount Quoted Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets - Marketable securities $ 7,491 $ 7,491 $ — $ — December 31, 2017 Estimated Fair Value Measurements Carrying Amount Quoted Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets - Marketable securities $ 7,321 $ 7,321 $ — $ —

Supplemental Financial Inform35

Supplemental Financial Information (Tables)	6 Months Ended
	Jun. 30, 2018
Supplemental Financial Information [Abstract]
Effect of Changes in Other Assets and Liabilities on Cash Flows from Operating Activities	The net effect of changes in other assets and liabilities on cash flows from operating activities is as follows: Noble-UK Noble-Cayman Six Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Accounts receivable $ (7,533 ) $ 76,495 $ (7,533 ) $ 76,495 Other current assets 6,534 15,896 5,962 12,475 Other assets (15,049 ) (40,078 ) (12,426 ) (47,166 ) Accounts payable 1,014 (8,881 ) 993 (8,754 ) Other current liabilities (10,094 ) (19,385 ) (9,680 ) (18,293 ) Other liabilities (8,396 ) 3,903 (8,396 ) 10,747 Total net change in assets and liabilities $ (33,524 ) $ 27,950 $ (31,080 ) $ 25,504

Condensed Consolidating Finan36

Condensed Consolidating Financial Information (Tables)	6 Months Ended
	Jun. 30, 2018
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Guarantor Obligations	Noble-Cayman, or one or more 100 percent owned subsidiaries of Noble-Cayman, is an issuer, co-issuer or full and unconditional guarantor or otherwise obligated as of June 30, 2018 with respect to registered securities as follows (see “ Note 7— Debt ” for additional information): Issuer Notes (1) (Co-Issuer(s)) Guarantor $250 million 5.75% Senior Notes due 2018 NHIL Noble-Cayman $202 million 7.50% Senior Notes due 2019 (2) NHUS Noble-Cayman Noble Drilling Holding, LLC (“NDH” ) Noble Drilling Services 6 LLC (“NDS6”) $168 million 4.90% Senior Notes due 2020 NHIL Noble-Cayman $209 million 4.625% Senior Notes due 2021 NHIL Noble-Cayman $126 million 3.95% Senior Notes due 2022 NHIL Noble-Cayman $1 billion 7.75% Senior Notes due 2024 NHIL Noble-Cayman $450 million 7.95% Senior Notes due 2025 NHIL Noble-Cayman $400 million 6.20% Senior Notes due 2040 NHIL Noble-Cayman $400 million 6.05% Senior Notes due 2041 NHIL Noble-Cayman $500 million 5.25% Senior Notes due 2042 NHIL Noble-Cayman $400 million 8.95% Senior Notes due 2045 NHIL Noble-Cayman (1) Our 2026 Notes are excluded from this list as they are unregistered securities issued in a non-public offering. (2) In February 2018, the entire remaining principal amount of 2019 Notes were redeemed and, as a result, we have prospectively eliminated NHUS, NDH, and NDS6 as guarantors in the current year presentation of the Condensed Consolidating Financial Information. However, prior year information is presented as previously reported.
Condensed Consolidating Balance Sheet	NOBLE CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEET June 30, 2018 (in thousands) (Unaudited) Noble - NHIL Other Consolidating Total ASSETS Current assets Cash and cash equivalents $ 265 $ — $ 410,407 $ — $ 410,672 Accounts receivable — — 212,229 — 212,229 Taxes receivable — — 12,811 — 12,811 Short-term notes receivable from affiliates — — 3,175,662 (3,175,662 ) — Accounts receivable from affiliates 575,456 60,945 4,569,424 (5,205,825 ) — Prepaid expenses and other current assets — — 60,628 — 60,628 Total current assets 575,721 60,945 8,441,161 (8,381,487 ) 696,340 Property and equipment, at cost — — 10,924,509 — 10,924,509 Accumulated depreciation — — (2,403,099 ) — (2,403,099 ) Property and equipment, net — — 8,521,410 — 8,521,410 Notes receivable from affiliates 3,177,249 — — (3,177,249 ) — Investments in affiliates 4,357,569 12,209,685 — (16,567,254 ) — Other assets 915 — 174,194 — 175,109 Total assets $ 8,111,454 $ 12,270,630 $ 17,136,765 $ (28,125,990 ) $ 9,392,859 LIABILITIES AND EQUITY Current liabilities Short-term notes payables to affiliates $ — $ 3,175,662 $ — $ (3,175,662 ) $ — Accounts payable 2 — 93,429 — 93,431 Accrued payroll and related costs — — 41,821 — 41,821 Accounts payable to affiliates 3,729,486 839,938 636,401 (5,205,825 ) — Taxes payable — — 33,278 — 33,278 Interest payable 262 100,517 2,628 — 103,407 Other current liabilities — — 64,928 — 64,928 Total current liabilities 3,729,750 4,116,117 872,485 (8,381,487 ) 336,865 Long-term debt — 3,842,617 — 3,842,617 Notes payable to affiliates — — 3,177,249 (3,177,249 ) — Deferred income taxes — — 155,961 — 155,961 Other liabilities 19,929 — 264,894 — 284,823 Total liabilities 3,749,679 7,958,734 4,470,589 (11,558,736 ) 4,620,266 Commitments and contingencies — Total shareholder equity 4,361,775 4,311,896 12,255,358 (16,567,254 ) 4,361,775 Noncontrolling interests — — 410,818 — 410,818 Total equity 4,361,775 4,311,896 12,666,176 (16,567,254 ) 4,772,593 Total liabilities and equity $ 8,111,454 $ 12,270,630 $ 17,136,765 $ (28,125,990 ) $ 9,392,859 NOBLE CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEET December 31, 2017 (in thousands) (Unaudited) Noble- NHUS NDH NHIL NDS6 Other Consolidating Total ASSETS Current assets Cash and cash equivalents $ 11 $ — $ 23,160 $ 29,324 $ — $ 609,516 $ — $ 662,011 Accounts receivable — — 24,722 — — 179,974 — 204,696 Taxes receivable — 93,302 3 — — 12,040 — 105,345 Short-term notes receivable from affiliates — — 119,476 — 2,373,452 — (2,492,928 ) — Accounts receivable from affiliates 594,456 1,454 144,367 60,945 465,749 5,813,846 (7,080,817 ) — Prepaid expenses and other current assets — — 1,477 — 1 63,963 — 65,441 Total current assets 594,467 94,756 313,205 90,269 2,839,202 6,679,339 (9,573,745 ) 1,037,493 Property and equipment, at cost — — 857,784 — — 11,176,547 — 12,034,331 Accumulated depreciation — — (110,005 ) — — (2,435,086 ) — (2,545,091 ) Property and equipment, net — — 747,779 — — 8,741,461 — 9,489,240 Notes receivable from affiliates 3,177,248 — 1,199,815 — 3,943,299 1,175,300 (9,495,662 ) — Investments in affiliates 4,933,978 4,550,358 5,252,135 12,560,598 7,237,474 — (34,534,543 ) — Other assets 2,663 16,775 8,372 — — 238,718 — 266,528 Total assets $ 8,708,356 $ 4,661,889 $ 7,521,306 $ 12,650,867 $ 14,019,975 $ 16,834,818 $ (53,603,950 ) $ 10,793,261 LIABILITIES AND EQUITY Current liabilities Short-term notes payables to affiliates $ — $ 1,605,243 $ — $ — $ — $ 887,685 $ (2,492,928 ) $ — Current maturities of long-term debt — — — 249,843 — — — 249,843 Accounts payable — — 1,467 — — 82,406 — 83,873 Accrued payroll and related costs — — 4,780 — — 50,124 — 54,904 Accounts payable to affiliates 3,410,669 393,073 1,770,066 661,375 — 845,634 (7,080,817 ) — Taxes payable — — — — — 33,965 — 33,965 Interest payable 2,211 — — 83,960 12,018 — — 98,189 Other current liabilities — — 5,169 — — 66,297 — 71,466 Total current liabilities 3,412,880 1,998,316 1,781,482 995,178 12,018 1,966,111 (9,573,745 ) 592,240 Long-term debt — — — 3,594,332 201,535 — — 3,795,867 Notes payable to affiliates — 700,000 474,637 3,175,663 — 5,145,362 (9,495,662 ) — Deferred income taxes — — 5 — — 164,957 — 164,962 Other liabilities 19,929 — 30,330 — — 239,919 — 290,178 Total liabilities 3,432,809 2,698,316 2,286,454 7,765,173 213,553 7,516,349 (19,069,407 ) 4,843,247 Commitments and contingencies Total shareholder equity 5,275,547 1,963,573 5,234,852 4,885,694 13,806,422 8,644,002 (34,534,543 ) 5,275,547 Noncontrolling interests — — — — — 674,467 — 674,467 Total equity 5,275,547 1,963,573 5,234,852 4,885,694 13,806,422 9,318,469 (34,534,543 ) 5,950,014 Total liabilities and equity $ 8,708,356 $ 4,661,889 $ 7,521,306 $ 12,650,867 $ 14,019,975 $ 16,834,818 $ (53,603,950 ) $ 10,793,261
Condensed Consolidating Statement of Income	NOBLE CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS and COMPREHENSIVE INCOME (LOSS) Three Months Ended June 30, 2018 (in thousands) (Unaudited) Noble- NHIL Other Consolidating Total Operating revenues Contract drilling services $ — $ — $ 247,689 $ — $ 247,689 Reimbursables and other — — 10,680 — 10,680 Total operating revenues — — 258,369 — 258,369 Operating costs and expenses Contract drilling services 74 793 149,881 — 150,748 Reimbursables — — 8,297 — 8,297 Depreciation and amortization — — 128,173 — 128,173 General and administrative 32 565 7,524 — 8,121 Loss on impairment — — 792,843 — 792,843 Total operating costs and expenses 106 1,358 1,086,718 — 1,088,182 Operating loss (106 ) (1,358 ) (828,349 ) — (829,813 ) Other income (expense) Income (loss) of unconsolidated affiliates (613,855 ) (363,431 ) — 977,286 — Interest expense (15 ) (105,771 ) (11,889 ) 43,545 (74,130 ) Interest income and other, net 1,586 (2 ) 44,812 (43,545 ) 2,851 Income (loss) before income taxes (612,390 ) (470,562 ) (795,426 ) 977,286 (901,092 ) Income tax benefit — — 38,733 — 38,733 Net income (loss) (612,390 ) (470,562 ) (756,693 ) 977,286 (862,359 ) Net income attributable to noncontrolling interests — — 249,969 — 249,969 Net income (loss) attributable to Noble Corporation (612,390 ) (470,562 ) (506,724 ) 977,286 (612,390 ) Other comprehensive income (loss), net (2,446 ) — (2,446 ) 2,446 (2,446 ) Comprehensive income (loss) attributable to Noble Corporation $ (614,836 ) $ (470,562 ) $ (509,170 ) $ 979,732 $ (614,836 ) NOBLE CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS and COMPREHENSIVE INCOME (LOSS) Six Months Ended June 30, 2018 (in thousands) (Unaudited) Noble- NHIL Other Consolidating Total Operating revenues Contract drilling services $ — $ — $ 476,795 $ — $ 476,795 Reimbursables and other — — 16,731 — 16,731 Total operating revenues — — 493,526 — 493,526 Operating costs and expenses Contract drilling services 155 1,397 285,603 — 287,155 Reimbursables — — 12,647 — 12,647 Depreciation and amortization — — 255,812 — 255,812 General and administrative 65 1,183 20,330 — 21,578 Loss on impairment — — 792,843 — 792,843 Total operating costs and expenses 220 2,580 1,367,235 — 1,370,035 Operating loss (220 ) (2,580 ) (873,709 ) — (876,509 ) Other income (expense) Income (loss) of unconsolidated affiliates (744,671 ) (350,913 ) — 1,095,584 — Interest expense (460 ) (225,592 ) (11,889 ) 87,796 (150,145 ) Gain (loss) on extinguishment of debt, net (2,336 ) 5,419 (11,851 ) — (8,768 ) Interest income and other, net 3,154 (131 ) 88,970 (87,796 ) 4,197 Income (loss) before income taxes (744,533 ) (573,797 ) (808,479 ) 1,095,584 (1,031,225 ) Income tax benefit — — 35,737 — 35,737 Net income (loss) (744,533 ) (573,797 ) (772,742 ) 1,095,584 (995,488 ) Net income attributable to noncontrolling interests — — 250,955 — 250,955 Net income (loss) attributable to Noble Corporation (744,533 ) (573,797 ) (521,787 ) 1,095,584 (744,533 ) Other comprehensive income (loss), net (1,455 ) — (1,455 ) 1,455 (1,455 ) Comprehensive income (loss) attributable to Noble Corporation $ (745,988 ) $ (573,797 ) $ (523,242 ) $ 1,097,039 $ (745,988 ) NOBLE CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENT OF INCOME and COMPREHENSIVE INCOME (LOSS) Three Months Ended June 30, 2017 (in thousands) (Unaudited) Noble- NHUS NDH NHIL NDS6 Other Consolidating Total Operating revenues Contract drilling services $ — $ — $ 39,988 $ — $ — $ 241,488 $ (9,944 ) $ 271,532 Reimbursables and other — — 892 — — 5,718 — 6,610 Total operating revenues — — 40,880 — — 247,206 (9,944 ) 278,142 Operating costs and expenses Contract drilling services (866 ) 3,362 12,687 (10,834 ) — 167,862 (9,944 ) 162,267 Reimbursables — — 472 — — 3,922 — 4,394 Depreciation and amortization — — 14,005 — — 120,628 — 134,633 General and administrative (442 ) 1,538 — (5,941 ) 5 18,071 — 13,231 Total operating costs and expenses (1,308 ) 4,900 27,164 (16,775 ) 5 310,483 (9,944 ) 314,525 Operating income (loss) 1,308 (4,900 ) 13,716 16,775 (5 ) (63,277 ) — (36,383 ) Other income (expense) Income (loss) of unconsolidated affiliates (85,274 ) (99,354 ) 39,114 48,476 5,647 — 91,391 — Income (loss) of unconsolidated affiliates - discontinued operations, net of tax 2,967 4,566 — — — — (7,533 ) — Interest expense (2,578 ) (6,345 ) (3,291 ) (107,686 ) (3,854 ) (23,134 ) 73,679 (73,209 ) Interest income and other, net 2,646 (26 ) 14,309 720 53,560 5,608 (73,679 ) 3,138 Income (loss) from continuing operations before income taxes (80,931 ) (106,059 ) 63,848 (41,715 ) 55,348 (80,803 ) 83,858 (106,454 ) Income tax benefit (provision) — 66,127 (835 ) — — (47,079 ) — 18,213 Net income (loss) from continuing operations (80,931 ) (39,932 ) 63,013 (41,715 ) 55,348 (127,882 ) 83,858 (88,241 ) Net income (loss) from discontinuing operations, net of tax (1,598 ) — — — 4,565 — 2,967 Net Income (loss) (80,931 ) (41,530 ) 63,013 (41,715 ) 55,348 (123,317 ) 83,858 (85,274 ) Net (income) loss attributable to noncontrolling interests — — — — — 4,821 (478 ) 4,343 Net income (loss) attributable to Noble Corporation (80,931 ) (41,530 ) 63,013 (41,715 ) 55,348 (118,496 ) 83,380 (80,931 ) Other comprehensive income (loss), net 1,318 — — — — 1,318 (1,318 ) 1,318 Comprehensive income (loss) attributable to Noble Corporation $ (79,613 ) $ (41,530 ) $ 63,013 $ (41,715 ) $ 55,348 $ (117,178 ) $ 82,062 $ (79,613 ) NOBLE CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENT OF INCOME and COMPREHENSIVE INCOME (LOSS) Six Months Ended June 30, 2017 (in thousands) (Unaudited) Noble- NHUS NDH NHIL NDS6 Other Consolidating Total Operating revenues Contract drilling services $ — $ — $ 87,092 $ — $ — $ 566,212 $ (27,113 ) $ 626,191 Reimbursables and other — — 2,028 — — 12,899 — 14,927 Total operating revenues — — 89,120 — — 579,111 (27,113 ) 641,118 Operating costs and expenses Contract drilling services 135 5,933 24,186 1,653 — 317,873 (27,113 ) 322,667 Reimbursables — — 1,292 — — 8,248 — 9,540 Depreciation and amortization — — 30,520 — — 239,831 — 270,351 General and administrative 71 2,845 — 892 9 18,478 — 22,295 Total operating costs and expenses 206 8,778 55,998 2,545 9 584,430 (27,113 ) 624,853 Operating income (loss) (206 ) (8,778 ) 33,122 (2,545 ) (9 ) (5,319 ) — 16,265 Other income (expense) Income (loss) of unconsolidated affiliates (380,376 ) (412,919 ) 41,483 145,293 56,266 — 550,253 — Income (loss) of unconsolidated affiliates - discontinued operations, net of tax 2,967 4,566 — — — — (7,533 ) — Interest expense (5,183 ) (23,856 ) (6,383 ) (213,688 ) (7,671 ) (80,447 ) 190,572 (146,656 ) Interest income and other, net 7,278 (91 ) 54,211 4,923 116,978 11,914 (190,572 ) 4,641 Income (loss) from continuing operations before income taxes (375,520 ) (441,078 ) 122,433 (66,017 ) 165,564 (73,852 ) 542,720 (125,750 ) Income tax benefit (provision) — 116,586 (326 ) — — (355,420 ) — (239,160 ) Net income (loss) from continuing operations (375,520 ) (324,492 ) 122,107 (66,017 ) 165,564 (429,272 ) 542,720 (364,910 ) Net income (loss) from discontinuing operations, net of tax — (1,598 ) — — — 4,565 — 2,967 Net Income (loss) (375,520 ) (326,090 ) 122,107 (66,017 ) 165,564 (424,707 ) 542,720 (361,943 ) Net income attributable to noncontrolling interests — — — — — (12,761 ) (816 ) (13,577 ) Net income (loss) attributable to Noble Corporation (375,520 ) (326,090 ) 122,107 (66,017 ) 165,564 (437,468 ) 541,904 (375,520 ) Other comprehensive income (loss), net 1,786 — — — — 1,786 (1,786 ) 1,786 Comprehensive income (loss) attributable to Noble Corporation $ (373,734 ) $ (326,090 ) $ 122,107 $ (66,017 ) $ 165,564 $ (435,682 ) $ 540,118 $ (373,734 )
Condensed Consolidating Statement of Cash Flows	NOBLE CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS Six Months Ended June 30, 2018 (in thousands) (Unaudited) Noble- NHIL Other Consolidating Total Cash flows from operating activities Net cash provided by (used in) operating activities $ 15,220 $ (206,481 ) $ 270,815 $ — $ 79,554 Cash flows from investing activities Capital expenditures — — (75,874 ) — (75,874 ) Proceeds from disposal of assets — — 3,755 — 3,755 Net cash used in investing activities — — (72,119 ) — (72,119 ) Cash flows from financing activities Issuance of senior notes — 750,000 — — 750,000 Repayment of long-term debt — (738,555 ) (213,654 ) — (952,209 ) Debt issuance costs on senior notes and credit facility (822 ) (12,581 ) (1,399 ) — (14,802 ) Dividends paid to noncontrolling interests — — (12,694 ) — (12,694 ) Distributions to parent company, net (29,069 ) — — — (29,069 ) Advances (to) from affiliates 14,925 178,293 (193,218 ) — — Net cash provided by (used in) financing activities (14,966 ) 177,157 (420,965 ) — (258,774 ) Net change in cash and cash equivalents 254 (29,324 ) (222,269 ) — (251,339 ) Cash and cash equivalents, beginning of period 11 29,324 632,676 — 662,011 Cash and cash equivalents, end of period $ 265 $ — $ 410,407 $ — $ 410,672 NOBLE CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS Six Months Ended June 30, 2017 (in thousands) (Unaudited) Noble- NHUS NDH NHIL NDS6 Other Consolidating Total Cash flows from operating activities Net cash provided by (used in) operating activities $ 18,027 $ 128,277 $ 94,821 $ (173,014 ) $ 109,339 $ 91,919 $ — $ 269,369 Cash flows from investing activities Capital expenditures — — (1,309 ) — — (66,299 ) — (67,608 ) Proceeds from disposal of assets — — 7 — — 307 — 314 Net cash used in investing activities — — (1,302 ) — — (65,992 ) — (67,294 ) Cash flows from financing activities Repayment of long-term debt — — — (300,000 ) — — — (300,000 ) Debt issuance costs on senior notes and credit facilities — — — (42 ) — — — (42 ) Dividends paid to noncontrolling interests — — — — — (5,393 ) — (5,393 ) Contributions from parent company, net 51,705 — — — — — — 51,705 Advances (to) from affiliates (72,255 ) (128,277 ) (104,255 ) 473,423 (109,339 ) (59,297 ) — — Net cash provided by (used in) financing activities (20,550 ) (128,277 ) (104,255 ) 173,381 (109,339 ) (64,690 ) — (253,730 ) Net change in cash and cash equivalents (2,523 ) — (10,736 ) 367 — (38,763 ) — (51,655 ) Cash and cash equivalents, beginning of period 2,537 — 10,855 — — 640,441 — 653,833 Cash and cash equivalents, end of period $ 14 $ — $ 119 $ 367 $ — $ 601,678 $ — $ 602,178

Organization and Basis of Pre37

Organization and Basis of Presentation (Details)	6 Months Ended
	Jun. 30, 2018SegmentVessel
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of drillships (vessel)	8
Number of semisubmersibles (vessel)	4
Number of jackups (vessel)	12
Number of reportable segments | Segment	1

Accounting Pronouncements (Deta

Accounting Pronouncements (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Jun. 30, 2018	Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stranded tax effect resulting from the Tax Cuts and Job Act	$ 0	$ (5,540)
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stranded tax effect resulting from the Tax Cuts and Job Act	5,540	$ 5,500
Accounting Standards Update 2016-16
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification due to new accounting standard	149,938
Accounting Standards Update 2016-16 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification due to new accounting standard	$ 149,938
Accounting Standards Update 2016-16 | Other assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification due to new accounting standard			$ 149,900
Accounting Standards Update 2016-16 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification due to new accounting standard			$ 149,900

Consolidated Joint Ventures (De

Consolidated Joint Ventures (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018USD ($)	Jun. 30, 2017USD ($)	Jun. 30, 2018USD ($)VesselJointVenture	Jun. 30, 2017USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Schedule Of Equity Method Investments [Line Items]
Percent of interest in joint ventures			50.00%
Number of joint ventures | JointVenture			2
Number of bully class drillships (vessel) | Vessel			2
Percentage attributable to noncontrolling interests	50.00%		50.00%
Loss on impairment	$ 792,843	$ 0	$ 792,843	$ 0
Cash and cash equivalents	411,492	$ 602,977	411,492	602,977	$ 662,829	$ 725,722
Bully Joint Venture
Schedule Of Equity Method Investments [Line Items]
Dividends approved			25,400	52,600
Dividends paid			25,400	$ 10,800
Carrying amount of the drillships	700,000		700,000		1,300,000
Loss on impairment	250,300		250,300
Cash and cash equivalents	41,300		41,300		$ 41,600
Drillships
Schedule Of Equity Method Investments [Line Items]
Loss on impairment	763,700		29,100
Drillships | Bully Joint Venture
Schedule Of Equity Method Investments [Line Items]
Loss on impairment	$ 550,300		$ 550,300

Loss Per Share - Computation of

Loss Per Share - Computation of Basic and Diluted Earnings Per Share for Noble-UK (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Basic
Net loss from continuing operations	$ (628,063)	$ (91,864)	$ (770,397)	$ (393,558)
Net loss from discontinued operations, net of tax	0	(1,486)	0	(1,486)
Net loss attributable to Noble Corporation plc	(628,063)	(93,350)	(770,397)	(395,044)
Diluted
Net loss attributable to Noble Corporation plc	$ (628,063)	$ (93,350)	$ (770,397)	$ (395,044)
Denominator:
Weighted average shares outstanding - basic (shares)	246,740	244,828	246,438	244,527
Weighted average shares outstanding - diluted (shares)	246,740	244,828	246,438	244,527
Basic:
Income (loss) from continuing operations (usd per share)	$ (2.55)	$ (0.37)	$ (3.13)	$ (1.61)
Loss from discontinued operations (usd per share)	0	(0.01)	0	(0.01)
Net income (loss) attributable to the company (usd per share)	(2.55)	(0.38)	(3.13)	(1.62)
Diluted:
Income (loss) from continuing operations (usd per share)	(2.55)	(0.37)	(3.13)	(1.61)
Loss from discontinued operations (usd per share)	0	(0.01)	0	(0.01)
Net income (loss) (usd per share)	$ (2.55)	$ (0.38)	$ (3.13)	$ (1.62)

Loss Per Share - Additional Inf

Loss Per Share - Additional Information (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares outstanding and trading (shares)	246,760,000		246,760,000		244,971,000
Additional shares authorized for issuance (shares)			82,200,000
Current nominal value per share (usd per share)	$ 0.01		$ 0.01		$ 0.01
Shares alloted (shares)	0		0
Number of shares repurchased (shares)	0		0
Equity option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the diluted net income per share (shares)	13,400,000	12,600,000	13,400,000	12,600,000

Receivables from Customers (Det

Receivables from Customers (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2016
Accounts Notes And Loans Receivable [Line Items]
Other long-term asset write-off	$ 0	$ 14,419
Petroleos Mexicanos | Contract drilling services costs | Uncollectible receivables
Accounts Notes And Loans Receivable [Line Items]
Other long-term asset write-off		$ 14,400
Petroleos Mexicanos | Other assets
Accounts Notes And Loans Receivable [Line Items]
Approximate receivable			$ 14,400

Property and Equipment (Details

Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 10,924,509		$ 10,924,509		$ 12,034,331
Loss on impairment	792,843	$ 0	792,843	$ 0
Drilling equipment and facilities
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	10,610,440		10,610,440		11,746,629
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	111,304		111,304		83,509
Other
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 202,765		$ 202,765		$ 204,193

Debt - Additional Information (

Debt - Additional Information (Details)

Jan. 31, 2018USD ($)

Dec. 31, 2017USD ($)

Oct. 18, 2017

Mar. 31, 2018USD ($)

Feb. 28, 2018USD ($)

Jun. 30, 2018USD ($)

Jun. 30, 2017USD ($)

Jun. 30, 2018USD ($)

Jun. 30, 2017USD ($)

Feb. 01, 2018USD ($)

Jan. 03, 2018USD ($)

Dec. 21, 2017USD ($)

Dec. 31, 2015

Debt Instrument [Line Items]

Net loss due to reduction of aggregate principal amount

$ 2,300,000

Loss on extinguishment of debt, net

$ 0

$ 0

8,768,000

$ 0

Maximum debt to tangible capitalization covenant

60.00%

Line of credit | 2015 Credit Facility

Debt Instrument [Line Items]

Borrowings outstanding or letters of credit issued

0

0

Line of credit | 2017 Credit Facility

Debt Instrument [Line Items]

Maximum borrowing capacity under credit facilities

$ 1,500,000,000

Borrowings outstanding or letters of credit issued

$ 0

$ 0

Senior unsecured notes

Debt Instrument [Line Items]

Repurchase amount

$ 8,700,000

$ 750,000,000

Purchase of senior notes

9,500,000

$ 754,200,000

Loss on extinguishment of debt, net

(500,000)

$ 3,500,000

Extinguished aggregate principal amount

$ 126,600,000

Senior unsecured notes | Multiple senior notes

Debt Instrument [Line Items]

Repurchase amount

$ 750,000,000

Senior unsecured notes | 2026 Notes | NHIL

Debt Instrument [Line Items]

Proceeds of offering, after estimated expenses

$ 737,400,000

Required percentage of book value of material drilling equipment

85.00%

85.00%

Senior unsecured notes | 7.95% Senior Notes due April 2025

Debt Instrument [Line Items]

Interest rate increase (decrease)

7.95%

Senior unsecured notes | 8.95% Senior Notes due April 2045

Debt Instrument [Line Items]

Interest rate increase (decrease)

8.95%

Senior unsecured notes | 7.50% Senior Notes due March 2019

Debt Instrument [Line Items]

Repurchase amount

65,300,000

Purchase of senior notes

61,900,000

Loss on extinguishment of debt, net

$ 3,500,000

Senior unsecured credit facility

Debt Instrument [Line Items]

Senior unsecured revolving credit facility maturity period

5 years

Maximum borrowing capacity under credit facilities

$ 2,400,000,000

Letters of credit

Debt Instrument [Line Items]

Maximum borrowing capacity under credit facilities

$ 500,000,000

Letters of credit | Line of credit | 2017 Credit Facility

Debt Instrument [Line Items]

Maximum borrowing capacity under credit facilities

15,000,000

Credit Facility | Line of credit | 2015 Credit Facility

Debt Instrument [Line Items]

Maximum borrowing capacity under credit facilities

300,000,000

Credit Facility | Line of credit | 2017 Credit Facility

Debt Instrument [Line Items]

Credit facility, ability to increase (up to)

$ 500,000,000

Maximum debt to tangible capitalization covenant

55.00%

Covenant, rig value of marketed rigs to indebtedness, end of each fiscal quarter

3

Covenant, rig value of closing date rigs, end of each fiscal quarter

0.8

Covenant, restrictions on borrowings, maximum Available Cash

$ 200,000,000

Debt - Estimated Fair Value of

Debt - Estimated Fair Value of Our Long-Term Debt, not Including Effect of Unamortized Debt Issuance Costs (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 0	$ 249,843
5.75% Senior Notes due March 2018
Debt Instrument [Line Items]
Interest rate on senior notes	5.75%
7.50% Senior Notes due March 2019
Debt Instrument [Line Items]
Interest rate on senior notes	7.50%
4.90% Senior Notes due August 2020
Debt Instrument [Line Items]
Interest rate on senior notes	4.90%
4.625% Senior Notes due March 2021
Debt Instrument [Line Items]
Interest rate on senior notes	4.625%
3.95% Senior Notes due March 2022
Debt Instrument [Line Items]
Interest rate on senior notes	3.95%
7.75% Senior Notes due January 2024
Debt Instrument [Line Items]
Interest rate on senior notes	7.75%
7.95% Senior Notes due April 2025
Debt Instrument [Line Items]
Interest rate on senior notes	7.95%
6.20% Senior Notes due August 2040
Debt Instrument [Line Items]
Interest rate on senior notes	6.20%
6.05% Senior Notes due March 2041
Debt Instrument [Line Items]
Interest rate on senior notes	6.05%
5.25% Senior Notes due March 2042
Debt Instrument [Line Items]
Interest rate on senior notes	5.25%
8.95% Senior Notes due April 2045
Debt Instrument [Line Items]
Interest rate on senior notes	8.95%
Senior unsecured notes | Carrying Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 3,842,617	4,045,710
Current maturities of long-term debt	0	249,843
Long-term debt	3,842,617	3,795,867
Senior unsecured notes | Estimated Fair Value
Debt Instrument [Line Items]
Senior unsecured notes	3,423,308	3,350,723
Current maturities of long-term debt	0	250,830
Long-term debt	$ 3,423,308	3,099,893
Senior unsecured notes | 5.75% Senior Notes due March 2018
Debt Instrument [Line Items]
Interest rate on senior notes	5.75%
Senior unsecured notes | 5.75% Senior Notes due March 2018 | Carrying Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 0	249,843
Senior unsecured notes | 5.75% Senior Notes due March 2018 | Estimated Fair Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 0	250,830
Senior unsecured notes | 7.50% Senior Notes due March 2019
Debt Instrument [Line Items]
Interest rate on senior notes	7.50%
Senior unsecured notes | 7.50% Senior Notes due March 2019 | Carrying Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 0	201,535
Senior unsecured notes | 7.50% Senior Notes due March 2019 | Estimated Fair Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 0	206,881
Senior unsecured notes | 4.90% Senior Notes due August 2020
Debt Instrument [Line Items]
Interest rate on senior notes	4.90%
Senior unsecured notes | 4.90% Senior Notes due August 2020 | Carrying Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 65,786	167,422
Senior unsecured notes | 4.90% Senior Notes due August 2020 | Estimated Fair Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 64,773	163,283
Senior unsecured notes | 4.625% Senior Notes due March 2021
Debt Instrument [Line Items]
Interest rate on senior notes	4.625%
Senior unsecured notes | 4.625% Senior Notes due March 2021 | Carrying Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 92,865	208,095
Senior unsecured notes | 4.625% Senior Notes due March 2021 | Estimated Fair Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 89,655	195,687
Senior unsecured notes | 3.95% Senior Notes due March 2022
Debt Instrument [Line Items]
Interest rate on senior notes	3.95%
Senior unsecured notes | 3.95% Senior Notes due March 2022 | Carrying Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 41,606	125,307
Senior unsecured notes | 3.95% Senior Notes due March 2022 | Estimated Fair Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 38,170	107,348
Senior unsecured notes | 7.75% Senior Notes due January 2024
Debt Instrument [Line Items]
Interest rate on senior notes	7.75%
Senior unsecured notes | 7.75% Senior Notes due January 2024 | Carrying Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 782,057	971,498
Senior unsecured notes | 7.75% Senior Notes due January 2024 | Estimated Fair Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 760,838	861,160
Senior unsecured notes | 7.95% Senior Notes due April 2025
Debt Instrument [Line Items]
Interest rate on senior notes	7.95%
Senior unsecured notes | 7.95% Senior Notes due April 2025 | Carrying Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 446,308	446,106
Senior unsecured notes | 7.95% Senior Notes due April 2025 | Estimated Fair Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 416,727	380,732
Senior unsecured notes | 7.875% Senior Notes due February 2026
Debt Instrument [Line Items]
Interest rate on senior notes	7.875%
Senior unsecured notes | 7.875% Senior Notes due February 2026 | Carrying Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 737,900	0
Senior unsecured notes | 7.875% Senior Notes due February 2026 | Estimated Fair Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 772,695	0
Senior unsecured notes | 6.20% Senior Notes due August 2040
Debt Instrument [Line Items]
Interest rate on senior notes	6.20%
Senior unsecured notes | 6.20% Senior Notes due August 2040 | Carrying Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 396,771	396,738
Senior unsecured notes | 6.20% Senior Notes due August 2040 | Estimated Fair Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 291,504	274,988
Senior unsecured notes | 6.05% Senior Notes due March 2041
Debt Instrument [Line Items]
Interest rate on senior notes	6.05%
Senior unsecured notes | 6.05% Senior Notes due March 2041 | Carrying Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 394,569	394,514
Senior unsecured notes | 6.05% Senior Notes due March 2041 | Estimated Fair Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 288,936	273,988
Senior unsecured notes | 5.25% Senior Notes due March 2042
Debt Instrument [Line Items]
Interest rate on senior notes	5.25%
Senior unsecured notes | 5.25% Senior Notes due March 2042 | Carrying Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 494,125	494,063
Senior unsecured notes | 5.25% Senior Notes due March 2042 | Estimated Fair Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 341,250	315,430
Senior unsecured notes | 8.95% Senior Notes due April 2045
Debt Instrument [Line Items]
Interest rate on senior notes	8.95%
Senior unsecured notes | 8.95% Senior Notes due April 2045 | Carrying Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 390,630	390,589
Senior unsecured notes | 8.95% Senior Notes due April 2045 | Estimated Fair Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 358,760	$ 320,396

Accumulated Other Comprehensi46

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance				$ 5,950,628	$ 6,467,445
Other comprehensive income (loss) before reclassifications				(2,104)	1,019
Amounts reclassified from AOCI				649	767
Stranded tax effect resulting from the Tax Cuts and Job Act	$ 0			(5,540)
Stockholders' equity, adjusted balance	5,799,202
Other comprehensive income (loss), net		$ (2,446)	$ 1,318	(1,455)	1,786
Ending Balance	5,950,628	4,773,050	6,072,417	4,773,050	6,072,417
Unrealized Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance				0	0
Other comprehensive income (loss) before reclassifications				0	739
Amounts reclassified from AOCI				0	0
Stranded tax effect resulting from the Tax Cuts and Job Act				0
Stockholders' equity, adjusted balance	0
Other comprehensive income (loss), net				0	739
Ending Balance	0	0	739	0	739
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance				(27,603)	(35,865)
Other comprehensive income (loss) before reclassifications				0	0
Amounts reclassified from AOCI				649	767
Stranded tax effect resulting from the Tax Cuts and Job Act				(5,540)
Stockholders' equity, adjusted balance	(33,143)
Other comprehensive income (loss), net				649	767
Ending Balance	(27,603)	(32,494)	(35,098)	(32,494)	(35,098)
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance				(15,285)	(16,275)
Other comprehensive income (loss) before reclassifications				(2,104)	280
Amounts reclassified from AOCI				0	0
Stranded tax effect resulting from the Tax Cuts and Job Act				0
Stockholders' equity, adjusted balance	(15,285)
Other comprehensive income (loss), net				(2,104)	280
Ending Balance	(15,285)	(17,389)	(15,995)	(17,389)	(15,995)
Total
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance				(42,888)	(52,140)
Stranded tax effect resulting from the Tax Cuts and Job Act	(5,540)
Stockholders' equity, adjusted balance	(48,428)
Other comprehensive income (loss), net				(1,455)	1,786
Ending Balance	$ (42,888)	$ (49,883)	$ (50,354)	$ (49,883)	$ (50,354)

Revenue and Customers - Additio

Revenue and Customers - Additional Information (Details)	6 Months Ended
	Jun. 30, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Payment term	30 days
Minimum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Contract term	2 months
Maximum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Contract term	60 months

Revenue and Customers - Receiva

Revenue and Customers - Receivables, Contract Assets, and Contract Liabilities with Customers (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue from Contract with Customer [Abstract]
Current contract assets	$ 28,207	$ 21,229
Noncurrent contract assets	31,551	34,520
Total contract assets	59,758	55,749	$ 55,749
Current contract liabilities (deferred revenue)	(38,074)	(35,422)
Noncurrent contract liabilities (deferred revenue)	(60,602)	(73,439)
Total contract liabilities	$ (98,676)	$ (108,861)	$ (108,861)

Revenue and Customers - Signifi

Revenue and Customers - Significant Changes in Contract Assets and Contract Liabilities (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018USD ($)
Change In Contract With Customer, Asset And Liability [Roll Forward]
Contract assets, beginning balance	$ 55,749
Contract liabilities, beginning balance	(108,861)
Amortization of deferred costs	(13,684)
Additions to deferred costs	17,693
Amortization of deferred revenue	21,597
Additions to deferred revenue	(11,412)
Total	4,009
Total	10,185
Contract assets, ending balance	59,758
Contract liabilities, ending balance	$ (98,676)

Revenue and Customers - Remaini

Revenue and Customers - Remaining Performance Obligations (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligations	$ 23,283
Performance obligation, expected timing of satisfaction	6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligations	$ 27,585
Performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligations	$ 19,325
Performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligations	$ 15,657
Performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligations	$ 12,826
Performance obligation, expected timing of satisfaction
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligations	$ 98,676
Drillships | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligations	15,207
Drillships | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligations	16,963
Drillships | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligations	15,657
Drillships | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligations	15,657
Drillships | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligations	12,826
Drillships | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligations	76,310
Jackups | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligations	8,076
Jackups | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligations	10,622
Jackups | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligations	3,668
Jackups | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligations	0
Jackups | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligations	0
Jackups | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligations	$ 22,366

Revenue and Customers - Disaggr

Revenue and Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 258,369	$ 278,142	$ 493,526	$ 641,118
Drillships
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	128,498		240,245
Seimsubmerisibles
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	5,581		14,470
Jackups
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	113,610		222,080
Contract drilling services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 247,689	$ 271,532	$ 476,795	$ 626,191

Loss on Impairment (Details)

Loss on Impairment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Impaired Long-Lived Assets Held and Used [Line Items]
Loss on impairment	$ 792,843	$ 0	$ 792,843	$ 0
Percentage attributable to noncontrolling interests	50.00%		50.00%
Drillships
Impaired Long-Lived Assets Held and Used [Line Items]
Loss on impairment	$ 763,700		$ 29,100
Bully Joint Venture
Impaired Long-Lived Assets Held and Used [Line Items]
Loss on impairment	250,300		250,300
Bully Joint Venture | Drillships
Impaired Long-Lived Assets Held and Used [Line Items]
Loss on impairment	$ 550,300		$ 550,300

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Reserves for uncertain tax positions net	$ 182,300			$ 191,900
Related tax benefits	$ 1,000			1,000
Operational period	12 months
Impairment of three rigs and certain capital spares, non-cash tax item	$ 35,600
Internal tax restructuring, non-cash discrete tax item		$ 260,700
Accounting Standards Update 2016-16
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification due to new accounting standard				$ 149,938
Other assets | Accounting Standards Update 2016-16
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification due to new accounting standard			$ 149,900

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0	$ 0
Employer contributions	0	200,000	0	200,000
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Interest cost	354,000	492,000	819,000	970,000
Return on plan assets	(710,000)	(721,000)	(1,426,000)	(1,422,000)
Recognized net actuarial loss	0	245,000	0	511,000
Net pension benefit cost (gain)	(356,000)	16,000	(607,000)	59,000
U.S.
Defined Benefit Plan Disclosure [Line Items]
Interest cost	2,044,000	2,149,000	4,089,000	4,297,000
Return on plan assets	(2,978,000)	(2,941,000)	(5,957,000)	(5,882,000)
Recognized net actuarial loss	411,000	366,000	822,000	732,000
Net pension benefit cost (gain)	$ (523,000)	$ (426,000)	$ (1,046,000)	$ (853,000)

Derivative Instruments and He55

Derivative Instruments and Hedging Activities - Additional Information (Details) $ in Thousands	Jun. 30, 2018	May 10, 2016payment	Jun. 30, 2017USD ($)	Jun. 30, 2017USD ($)	Jun. 30, 2017USD ($)$ / bbl
Derivative [Line Items]
Number of contingent payments | payment		2
FCX Settlement
Derivative [Line Items]
Derivative contingent settlement period	12 months
FCX Settlement | Noble Corp
Derivative [Line Items]
Estimated fair value of contingent payments			$ 0	$ 0	$ 0
FCX Settlement | WTI crude oil, prices that did/did not average more than $50 per barrel
Derivative [Line Items]
Crude oil average price (usd per bbl) | $ / bbl					50
Non designated derivatives contingent payment					$ 25,000
FCX Settlement | WTI crude oil, prices that averaged more than $65 per barrel
Derivative [Line Items]
Crude oil average price (usd per bbl) | $ / bbl					65
Non designated derivatives contingent payment					$ 50,000
Non-designated derivatives | Contract drilling services | FCX Settlement
Derivative [Line Items]
Loss recognized through “Contract drilling services” revenue			$ (6,500)	$ (14,400)

Derivative Instruments and He56

Derivative Instruments and Hedging Activities - Summarization of Recognized Gains and Losses of Cash Flow Hedges (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017
Non-designated derivatives | FCX Settlement
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized loss recognized through AOCI	$ 0	$ 0
Non-designated derivatives | FCX Settlement | Contract drilling services
Derivative Instruments, Gain (Loss) [Line Items]
Loss reclassified from AOCI to Contract drilling services costs	0	0
Loss recognized through “Contract drilling services” revenue	(6,500)	(14,400)
Cash flow hedges | Foreign currency forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized loss recognized through AOCI	849	739
Cash flow hedges | Foreign currency forward contracts | Contract drilling services
Derivative Instruments, Gain (Loss) [Line Items]
Loss reclassified from AOCI to Contract drilling services costs	210	0
Loss recognized through “Contract drilling services” revenue	$ 0	$ 137

Fair Value of Financial Instr57

Fair Value of Financial Instruments - Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Quoted Prices in Active Markets (Level 1)
Assets -
Marketable securities	$ 7,491	$ 7,321
Significant Other Observable Inputs (Level 2)
Assets -
Marketable securities	0	0
Significant Unobservable Inputs (Level 3)
Assets -
Marketable securities	0	0
Carrying Amount
Assets -
Marketable securities	$ 7,491	$ 7,321

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Millions	1 Months Ended		6 Months Ended
	Jan. 31, 2017Rig	Dec. 31, 2014USD ($)	Jun. 30, 2018USD ($)	May 02, 2017USD ($)
Other Commitments [Line Items]
Number of newbuild rigs allegedly violating patents | Rig	5
Years of effectiveness of employment agreements after the termination of employment			3 years
Minimum
Other Commitments [Line Items]
Percentage of uncertain tax positions likelihood of being sustained (greater than)			50.00%
Paragon Offshore
Other Commitments [Line Items]
Litigation trust fund				$ 10
Income and other business taxes | Mexico | Foreign tax authority
Other Commitments [Line Items]
Approximate audit claims assessed			$ 48.6
Noble Discoverer and Kulluk
Other Commitments [Line Items]
Loss contingencies payments		$ 8.2
Period of probation		4 years
Possible early probation period		3 years
Noble Discoverer and Kulluk | Community service payments
Other Commitments [Line Items]
Loss contingencies payments		$ 4

Supplemental Financial Inform59

Supplemental Financial Information - Additional Information (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Condensed Balance Sheet Statements, Captions [Line Items]
Contract with customer, liability	$ 98,676	$ 108,861	$ 108,861
Capital expenditures incurred but not yet paid	34,100		25,500	$ 23,600	$ 35,100
Contract drilling services
Condensed Balance Sheet Statements, Captions [Line Items]
Contract with customer, liability	98,700		114,300
Contract with customer, asset	$ 59,800		$ 55,700

Supplemental Financial Inform60

Supplemental Financial Information - Effect of Changes in Other Assets and Liabilities on Cash Flows from Operating Activities (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating Capital [Line Items]
Total net change in assets and liabilities	$ (33,524)	$ 27,950
Noble-UK
Operating Capital [Line Items]
Accounts receivable	(7,533)	76,495
Other current assets	6,534	15,896
Other assets	(15,049)	(40,078)
Accounts payable	1,014	(8,881)
Other current liabilities	(10,094)	(19,385)
Other liabilities	(8,396)	3,903
Total net change in assets and liabilities	(33,524)	27,950
Noble-Cayman
Operating Capital [Line Items]
Accounts receivable	(7,533)	76,495
Other current assets	5,962	12,475
Other assets	(12,426)	(47,166)
Accounts payable	993	(8,754)
Other current liabilities	(9,680)	(18,293)
Other liabilities	(8,396)	10,747
Total net change in assets and liabilities	$ (31,080)	$ 25,504

Condensed Consolidating Finan61

Condensed Consolidating Financial Information - Guarantor Obligations (Details)	Jun. 30, 2018USD ($)
5.75% Senior Notes due March 2018
Guarantor Obligations [Line Items]
Face value of senior notes	$ 250,000,000
Interest rate on senior notes	5.75%
7.50% Senior Notes due March 2019
Guarantor Obligations [Line Items]
Face value of senior notes	$ 202,000,000
Interest rate on senior notes	7.50%
4.90% Senior Notes due August 2020
Guarantor Obligations [Line Items]
Face value of senior notes	$ 168,000,000
Interest rate on senior notes	4.90%
4.625% Senior Notes due March 2021
Guarantor Obligations [Line Items]
Face value of senior notes	$ 209,000,000
Interest rate on senior notes	4.625%
3.95% Senior Notes due March 2022
Guarantor Obligations [Line Items]
Face value of senior notes	$ 126,000,000
Interest rate on senior notes	3.95%
7.75% Senior Notes due January 2024
Guarantor Obligations [Line Items]
Face value of senior notes	$ 1,000,000,000
Interest rate on senior notes	7.75%
7.95% Senior Notes due April 2025
Guarantor Obligations [Line Items]
Face value of senior notes	$ 450,000,000
Interest rate on senior notes	7.95%
6.20% Senior Notes due August 2040
Guarantor Obligations [Line Items]
Face value of senior notes	$ 400,000,000
Interest rate on senior notes	6.20%
6.05% Senior Notes due March 2041
Guarantor Obligations [Line Items]
Face value of senior notes	$ 400,000,000
Interest rate on senior notes	6.05%
5.25% Senior Notes due March 2042
Guarantor Obligations [Line Items]
Face value of senior notes	$ 500,000,000
Interest rate on senior notes	5.25%
8.95% Senior Notes due April 2045
Guarantor Obligations [Line Items]
Face value of senior notes	$ 400,000,000
Interest rate on senior notes	8.95%

Condensed Consolidating Finan62

Condensed Consolidating Financial Information - Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 411,492	$ 662,829	$ 602,977	$ 725,722
Accounts receivable	212,229	204,696
Taxes receivable	12,811	105,345
Prepaid expenses and other current assets	60,721	66,105
Total current assets	697,253	1,038,975
Property and equipment, at cost	10,924,509	12,034,331
Accumulated depreciation	(2,403,099)	(2,545,091)
Property and equipment, net	8,521,410	9,489,240
Other assets	175,024	266,444
Total assets	9,393,687	10,794,659
Current liabilities
Current maturities of long-term debt	0	249,843
Accounts payable	93,612	84,032
Accrued payroll and related costs	41,852	54,904
Taxes payable	33,278	34,391
Interest payable	103,407	98,189
Other current liabilities	65,087	71,665
Total current liabilities	337,236	593,024
Long-term debt	3,842,617	3,795,867
Other liabilities	284,823	290,178
Total liabilities	4,620,637	4,844,031
Commitments and contingencies
Total shareholder equity	4,362,232	5,276,161
Noncontrolling interests	410,818	674,467
Total equity	4,773,050	5,950,628	6,072,417	6,467,445
Total liabilities and equity	9,393,687	10,794,659
Reportable Legal Entities
Current liabilities
Short-term notes payables to affiliates	0
Consolidating Adjustments
Current assets
Cash and cash equivalents	0	0	0	0
Accounts receivable	0	0
Taxes receivable	0	0
Short-term notes receivable from affiliates	(3,175,662)	(2,492,928)
Accounts receivable from affiliates	(5,205,825)	(7,080,817)
Prepaid expenses and other current assets	0	0
Total current assets	(8,381,487)	(9,573,745)
Property and equipment, at cost	0	0
Accumulated depreciation	0	0
Property and equipment, net	0	0
Notes receivable from affiliates	(3,177,249)	(9,495,662)
Investments in affiliates	(16,567,254)	(34,534,543)
Other assets	0	0
Total assets	(28,125,990)	(53,603,950)
Current liabilities
Short-term notes payables to affiliates	(3,175,662)	(2,492,928)
Current maturities of long-term debt		0
Accounts payable	0	0
Accrued payroll and related costs	0	0
Accounts payable to affiliates	(5,205,825)	(7,080,817)
Taxes payable	0	0
Interest payable	0	0
Other current liabilities	0	0
Total current liabilities	(8,381,487)	(9,573,745)
Long-term debt	0	0
Notes payable to affiliates	(3,177,249)	(9,495,662)
Deferred income taxes	0	0
Other liabilities	0	0
Total liabilities	(11,558,736)	(19,069,407)
Commitments and contingencies	0
Total shareholder equity	(16,567,254)	(34,534,543)
Noncontrolling interests	0	0
Total equity	(16,567,254)	(34,534,543)
Total liabilities and equity	(28,125,990)	(53,603,950)
Other Non-guarantor Subsidiaries of Noble | Reportable Legal Entities
Current assets
Cash and cash equivalents	410,407	632,676	601,678	640,441
Accounts receivable	212,229
Taxes receivable	12,811
Short-term notes receivable from affiliates	3,175,662
Accounts receivable from affiliates	4,569,424
Prepaid expenses and other current assets	60,628
Total current assets	8,441,161
Property and equipment, at cost	10,924,509
Accumulated depreciation	(2,403,099)
Property and equipment, net	8,521,410
Notes receivable from affiliates	0
Investments in affiliates	0
Other assets	174,194
Total assets	17,136,765
Current liabilities
Accounts payable	93,429
Accrued payroll and related costs	41,821
Accounts payable to affiliates	636,401
Taxes payable	33,278
Interest payable	2,628
Other current liabilities	64,928
Total current liabilities	872,485
Long-term debt
Notes payable to affiliates	3,177,249
Deferred income taxes	155,961
Other liabilities	264,894
Total liabilities	4,470,589
Commitments and contingencies
Total shareholder equity	12,255,358
Noncontrolling interests	410,818
Total equity	12,666,176
Total liabilities and equity	17,136,765
Other Non-guarantor Subsidiaries of Noble | Reportable Legal Entities
Current assets
Cash and cash equivalents		609,516
Accounts receivable		179,974
Taxes receivable		12,040
Short-term notes receivable from affiliates		0
Accounts receivable from affiliates		5,813,846
Prepaid expenses and other current assets		63,963
Total current assets		6,679,339
Property and equipment, at cost		11,176,547
Accumulated depreciation		(2,435,086)
Property and equipment, net		8,741,461
Notes receivable from affiliates		1,175,300
Investments in affiliates		0
Other assets		238,718
Total assets		16,834,818
Current liabilities
Short-term notes payables to affiliates		887,685
Current maturities of long-term debt		0
Accounts payable		82,406
Accrued payroll and related costs		50,124
Accounts payable to affiliates		845,634
Taxes payable		33,965
Interest payable		0
Other current liabilities		66,297
Total current liabilities		1,966,111
Long-term debt		0
Notes payable to affiliates		5,145,362
Deferred income taxes		164,957
Other liabilities		239,919
Total liabilities		7,516,349
Commitments and contingencies
Total shareholder equity		8,644,002
Noncontrolling interests		674,467
Total equity		9,318,469
Total liabilities and equity		16,834,818
Noble-Cayman
Current liabilities
Short-term notes payables to affiliates	0
Noble-Cayman | Reportable Legal Entities
Current assets
Cash and cash equivalents	265	11	14	2,537
Accounts receivable	0	0
Taxes receivable	0	0
Short-term notes receivable from affiliates	0	0
Accounts receivable from affiliates	575,456	594,456
Prepaid expenses and other current assets	0	0
Total current assets	575,721	594,467
Property and equipment, at cost	0	0
Accumulated depreciation	0	0
Property and equipment, net	0	0
Notes receivable from affiliates	3,177,249	3,177,248
Investments in affiliates	4,357,569	4,933,978
Other assets	915	2,663
Total assets	8,111,454	8,708,356
Current liabilities
Short-term notes payables to affiliates		0
Current maturities of long-term debt		0
Accounts payable	2	0
Accrued payroll and related costs	0	0
Accounts payable to affiliates	3,729,486	3,410,669
Taxes payable	0	0
Interest payable	262	2,211
Other current liabilities	0	0
Total current liabilities	3,729,750	3,412,880
Long-term debt	0	0
Notes payable to affiliates	0	0
Deferred income taxes	0	0
Other liabilities	19,929	19,929
Total liabilities	3,749,679	3,432,809
Commitments and contingencies
Total shareholder equity	4,361,775	5,275,547
Noncontrolling interests	0	0
Total equity	4,361,775	5,275,547
Total liabilities and equity	8,111,454	8,708,356
NHUS | Reportable Legal Entities
Current assets
Cash and cash equivalents		0	0	0
Accounts receivable		0
Taxes receivable		93,302
Short-term notes receivable from affiliates		0
Accounts receivable from affiliates		1,454
Prepaid expenses and other current assets		0
Total current assets		94,756
Property and equipment, at cost		0
Accumulated depreciation		0
Property and equipment, net		0
Notes receivable from affiliates		0
Investments in affiliates		4,550,358
Other assets		16,775
Total assets		4,661,889
Current liabilities
Short-term notes payables to affiliates		1,605,243
Current maturities of long-term debt		0
Accounts payable		0
Accrued payroll and related costs		0
Accounts payable to affiliates		393,073
Taxes payable		0
Interest payable		0
Other current liabilities		0
Total current liabilities		1,998,316
Long-term debt		0
Notes payable to affiliates		700,000
Deferred income taxes		0
Other liabilities		0
Total liabilities		2,698,316
Commitments and contingencies
Total shareholder equity		1,963,573
Noncontrolling interests		0
Total equity		1,963,573
Total liabilities and equity		4,661,889
NDH | Reportable Legal Entities
Current assets
Cash and cash equivalents		23,160	119	10,855
Accounts receivable		24,722
Taxes receivable		3
Short-term notes receivable from affiliates		119,476
Accounts receivable from affiliates		144,367
Prepaid expenses and other current assets		1,477
Total current assets		313,205
Property and equipment, at cost		857,784
Accumulated depreciation		(110,005)
Property and equipment, net		747,779
Notes receivable from affiliates		1,199,815
Investments in affiliates		5,252,135
Other assets		8,372
Total assets		7,521,306
Current liabilities
Short-term notes payables to affiliates		0
Current maturities of long-term debt		0
Accounts payable		1,467
Accrued payroll and related costs		4,780
Accounts payable to affiliates		1,770,066
Taxes payable		0
Interest payable		0
Other current liabilities		5,169
Total current liabilities		1,781,482
Long-term debt		0
Notes payable to affiliates		474,637
Deferred income taxes		5
Other liabilities		30,330
Total liabilities		2,286,454
Commitments and contingencies
Total shareholder equity		5,234,852
Noncontrolling interests		0
Total equity		5,234,852
Total liabilities and equity		7,521,306
NHIL | Reportable Legal Entities
Current assets
Cash and cash equivalents	0	29,324	367	0
Accounts receivable	0	0
Taxes receivable	0	0
Short-term notes receivable from affiliates	0	0
Accounts receivable from affiliates	60,945	60,945
Prepaid expenses and other current assets	0	0
Total current assets	60,945	90,269
Property and equipment, at cost	0	0
Accumulated depreciation	0	0
Property and equipment, net	0	0
Notes receivable from affiliates	0	0
Investments in affiliates	12,209,685	12,560,598
Other assets	0	0
Total assets	12,270,630	12,650,867
Current liabilities
Short-term notes payables to affiliates	3,175,662	0
Current maturities of long-term debt		249,843
Accounts payable	0	0
Accrued payroll and related costs	0	0
Accounts payable to affiliates	839,938	661,375
Taxes payable	0	0
Interest payable	100,517	83,960
Other current liabilities	0	0
Total current liabilities	4,116,117	995,178
Long-term debt	3,842,617	3,594,332
Notes payable to affiliates	0	3,175,663
Deferred income taxes	0	0
Other liabilities	0	0
Total liabilities	7,958,734	7,765,173
Commitments and contingencies
Total shareholder equity	4,311,896	4,885,694
Noncontrolling interests	0	0
Total equity	4,311,896	4,885,694
Total liabilities and equity	12,270,630	12,650,867
NDS6 | Reportable Legal Entities
Current assets
Cash and cash equivalents		0	0	0
Accounts receivable		0
Taxes receivable		0
Short-term notes receivable from affiliates		2,373,452
Accounts receivable from affiliates		465,749
Prepaid expenses and other current assets		1
Total current assets		2,839,202
Property and equipment, at cost		0
Accumulated depreciation		0
Property and equipment, net		0
Notes receivable from affiliates		3,943,299
Investments in affiliates		7,237,474
Other assets		0
Total assets		14,019,975
Current liabilities
Short-term notes payables to affiliates		0
Current maturities of long-term debt		0
Accounts payable		0
Accrued payroll and related costs		0
Accounts payable to affiliates		0
Taxes payable		0
Interest payable		12,018
Other current liabilities		0
Total current liabilities		12,018
Long-term debt		201,535
Notes payable to affiliates		0
Deferred income taxes		0
Other liabilities		0
Total liabilities		213,553
Commitments and contingencies
Total shareholder equity		13,806,422
Noncontrolling interests		0
Total equity		13,806,422
Total liabilities and equity		14,019,975
Noble Corp
Current assets
Cash and cash equivalents	410,672	662,011	602,178	653,833
Accounts receivable	212,229	204,696
Taxes receivable	12,811	105,345
Short-term notes receivable from affiliates	0	0
Accounts receivable from affiliates	0	0
Prepaid expenses and other current assets	60,628	65,441
Total current assets	696,340	1,037,493
Property and equipment, at cost	10,924,509	12,034,331
Accumulated depreciation	(2,403,099)	(2,545,091)
Property and equipment, net	8,521,410	9,489,240
Notes receivable from affiliates	0	0
Investments in affiliates	0	0
Other assets	175,109	266,528
Total assets	9,392,859	10,793,261
Current liabilities
Short-term notes payables to affiliates	0	0
Current maturities of long-term debt	0	249,843
Accounts payable	93,431	83,873
Accrued payroll and related costs	41,821	54,904
Accounts payable to affiliates	0	0
Taxes payable	33,278	33,965
Interest payable	103,407	98,189
Other current liabilities	64,928	71,466
Total current liabilities	336,865	592,240
Long-term debt	3,842,617	3,795,867
Notes payable to affiliates	0	0
Deferred income taxes	155,961	164,962
Other liabilities	284,823	290,178
Total liabilities	4,620,266	4,843,247
Commitments and contingencies
Total shareholder equity	4,361,775	5,275,547
Noncontrolling interests	410,818	674,467
Total equity	4,772,593	5,950,014	$ 6,072,386	$ 6,391,977
Total liabilities and equity	$ 9,392,859	$ 10,793,261

Condensed Consolidating Finan63

Condensed Consolidating Financial Information - Operations and Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating revenues
Revenue from contract with customer	$ 258,369	$ 278,142	$ 493,526	$ 641,118
Operating costs and expenses
Depreciation and amortization	129,681	136,594	258,436	272,312
General and administrative	21,717	18,658	43,800	34,538
Loss on impairment	792,843	0	792,843	0
Total operating costs and expenses	1,103,975	322,427	1,396,012	639,940
Operating income (loss)	(845,606)	(44,285)	(902,486)	1,178
Other income (expense)
Interest income (expense), net of amounts capitalized	(74,130)	(73,209)	(150,145)	(146,656)
Gain (loss) on extinguishment of debt, net	0	0	(8,768)	0
Interest income and other, net	2,865	3,074	4,204	4,691
Loss from continuing operations before income taxes	(916,871)	(114,420)	(1,057,195)	(140,787)
Income tax benefit (provision)	38,839	18,213	35,843	(239,194)
Net loss from continuing operations	(878,032)	(96,207)	(1,021,352)	(379,981)
Net loss from discontinued operations, net of tax	0	(1,486)	0	(1,486)
Net loss	(878,032)	(97,693)	(1,021,352)	(381,467)
Net (income) loss attributable to noncontrolling interests	249,969	4,343	250,955	(13,577)
Net income (loss) attributable to the company	(628,063)	(93,350)	(770,397)	(395,044)
Other comprehensive loss, net	(2,446)	1,318	(1,455)	1,786
Comprehensive income (loss) attributable to the company	(630,509)	(92,032)	(771,852)	(393,258)
Consolidating Adjustments
Operating revenues
Revenue from contract with customer	0	(9,944)	0	(27,113)
Operating costs and expenses
Depreciation and amortization	0	0	0	0
General and administrative	0	0	0	0
Loss on impairment	0		0
Total operating costs and expenses	0	(9,944)	0	(27,113)
Operating income (loss)	0	0	0	0
Other income (expense)
Income (loss) of unconsolidated affiliates - continuing operations	977,286	91,391	1,095,584	550,253
Income (loss) of unconsolidated affiliates - discontinued operations, net of tax		(7,533)		(7,533)
Interest income (expense), net of amounts capitalized	43,545	73,679	87,796	190,572
Gain (loss) on extinguishment of debt, net			0
Interest income and other, net	(43,545)	(73,679)	(87,796)	(190,572)
Loss from continuing operations before income taxes	977,286	83,858	1,095,584	542,720
Income tax benefit (provision)	0	0	0	0
Net loss from continuing operations		83,858		542,720
Net loss from discontinued operations, net of tax		0		0
Net loss	977,286	83,858	1,095,584	542,720
Net (income) loss attributable to noncontrolling interests	0	(478)	0	(816)
Net income (loss) attributable to the company	977,286	83,380	1,095,584	541,904
Other comprehensive loss, net	2,446	(1,318)	1,455	(1,786)
Comprehensive income (loss) attributable to the company	979,732	82,062	1,097,039	540,118
Other Non-guarantor Subsidiaries of Noble | Reportable Legal Entities
Operating revenues
Revenue from contract with customer	258,369	247,206	493,526	579,111
Operating costs and expenses
Depreciation and amortization	128,173	120,628	255,812	239,831
General and administrative	7,524	18,071	20,330	18,478
Loss on impairment	792,843		792,843
Total operating costs and expenses	1,086,718	310,483	1,367,235	584,430
Operating income (loss)	(828,349)	(63,277)	(873,709)	(5,319)
Other income (expense)
Income (loss) of unconsolidated affiliates - continuing operations	0	0	0	0
Income (loss) of unconsolidated affiliates - discontinued operations, net of tax		0		0
Interest income (expense), net of amounts capitalized	(11,889)	(23,134)	(11,889)	(80,447)
Gain (loss) on extinguishment of debt, net			(11,851)
Interest income and other, net	44,812	5,608	88,970	11,914
Loss from continuing operations before income taxes	(795,426)	(80,803)	(808,479)	(73,852)
Income tax benefit (provision)	38,733	(47,079)	35,737	(355,420)
Net loss from continuing operations		(127,882)		(429,272)
Net loss from discontinued operations, net of tax		4,565		4,565
Net loss	(756,693)	(123,317)	(772,742)	(424,707)
Net (income) loss attributable to noncontrolling interests	249,969	4,821	250,955	(12,761)
Net income (loss) attributable to the company	(506,724)	(118,496)	(521,787)	(437,468)
Other comprehensive loss, net	(2,446)	1,318	(1,455)	1,786
Comprehensive income (loss) attributable to the company	(509,170)	(117,178)	(523,242)	(435,682)
Noble-Cayman | Reportable Legal Entities
Operating revenues
Revenue from contract with customer	0	0	0	0
Operating costs and expenses
Depreciation and amortization	0	0	0	0
General and administrative	32	(442)	65	71
Loss on impairment	0		0
Total operating costs and expenses	106	(1,308)	220	206
Operating income (loss)	(106)	1,308	(220)	(206)
Other income (expense)
Income (loss) of unconsolidated affiliates - continuing operations	(613,855)	(85,274)	(744,671)	(380,376)
Income (loss) of unconsolidated affiliates - discontinued operations, net of tax		2,967		2,967
Interest income (expense), net of amounts capitalized	(15)	(2,578)	(460)	(5,183)
Gain (loss) on extinguishment of debt, net			(2,336)
Interest income and other, net	1,586	2,646	3,154	7,278
Loss from continuing operations before income taxes	(612,390)	(80,931)	(744,533)	(375,520)
Income tax benefit (provision)	0	0	0	0
Net loss from continuing operations		(80,931)		(375,520)
Net loss from discontinued operations, net of tax				0
Net loss	(612,390)	(80,931)	(744,533)	(375,520)
Net (income) loss attributable to noncontrolling interests	0	0	0	0
Net income (loss) attributable to the company	(612,390)	(80,931)	(744,533)	(375,520)
Other comprehensive loss, net	(2,446)	1,318	(1,455)	1,786
Comprehensive income (loss) attributable to the company	(614,836)	(79,613)	(745,988)	(373,734)
NHUS | Reportable Legal Entities
Operating revenues
Revenue from contract with customer		0		0
Operating costs and expenses
Depreciation and amortization		0		0
General and administrative		1,538		2,845
Total operating costs and expenses		4,900		8,778
Operating income (loss)		(4,900)		(8,778)
Other income (expense)
Income (loss) of unconsolidated affiliates - continuing operations		(99,354)		(412,919)
Income (loss) of unconsolidated affiliates - discontinued operations, net of tax		4,566		4,566
Interest income (expense), net of amounts capitalized		(6,345)		(23,856)
Interest income and other, net		(26)		(91)
Loss from continuing operations before income taxes		(106,059)		(441,078)
Income tax benefit (provision)		66,127		116,586
Net loss from continuing operations		(39,932)		(324,492)
Net loss from discontinued operations, net of tax		(1,598)		(1,598)
Net loss		(41,530)		(326,090)
Net (income) loss attributable to noncontrolling interests		0		0
Net income (loss) attributable to the company		(41,530)		(326,090)
Other comprehensive loss, net		0		0
Comprehensive income (loss) attributable to the company		(41,530)		(326,090)
NDH | Reportable Legal Entities
Operating revenues
Revenue from contract with customer		40,880		89,120
Operating costs and expenses
Depreciation and amortization		14,005		30,520
General and administrative		0		0
Total operating costs and expenses		27,164		55,998
Operating income (loss)		13,716		33,122
Other income (expense)
Income (loss) of unconsolidated affiliates - continuing operations		39,114		41,483
Income (loss) of unconsolidated affiliates - discontinued operations, net of tax		0		0
Interest income (expense), net of amounts capitalized		(3,291)		(6,383)
Interest income and other, net		14,309		54,211
Loss from continuing operations before income taxes		63,848		122,433
Income tax benefit (provision)		(835)		(326)
Net loss from continuing operations		63,013		122,107
Net loss from discontinued operations, net of tax		0		0
Net loss		63,013		122,107
Net (income) loss attributable to noncontrolling interests		0		0
Net income (loss) attributable to the company		63,013		122,107
Other comprehensive loss, net		0		0
Comprehensive income (loss) attributable to the company		63,013		122,107
NHIL | Reportable Legal Entities
Operating revenues
Revenue from contract with customer	0	0	0	0
Operating costs and expenses
Depreciation and amortization	0	0	0	0
General and administrative	565	(5,941)	1,183	892
Loss on impairment	0		0
Total operating costs and expenses	1,358	(16,775)	2,580	2,545
Operating income (loss)	(1,358)	16,775	(2,580)	(2,545)
Other income (expense)
Income (loss) of unconsolidated affiliates - continuing operations	(363,431)	48,476	(350,913)	145,293
Income (loss) of unconsolidated affiliates - discontinued operations, net of tax		0		0
Interest income (expense), net of amounts capitalized	(105,771)	(107,686)	(225,592)	(213,688)
Gain (loss) on extinguishment of debt, net			5,419
Interest income and other, net	(2)	720	(131)	4,923
Loss from continuing operations before income taxes	(470,562)	(41,715)	(573,797)	(66,017)
Income tax benefit (provision)	0	0	0	0
Net loss from continuing operations		(41,715)		(66,017)
Net loss from discontinued operations, net of tax		0		0
Net loss	(470,562)	(41,715)	(573,797)	(66,017)
Net (income) loss attributable to noncontrolling interests	0	0	0	0
Net income (loss) attributable to the company	(470,562)	(41,715)	(573,797)	(66,017)
Other comprehensive loss, net	0	0	0	0
Comprehensive income (loss) attributable to the company	(470,562)	(41,715)	(573,797)	(66,017)
NDS6
Operating revenues
Revenue from contract with customer			493,526
Operating costs and expenses
Depreciation and amortization			255,812
General and administrative			21,578
Loss on impairment			792,843
Total operating costs and expenses			1,370,035
Operating income (loss)			(876,509)
Other income (expense)
Income (loss) of unconsolidated affiliates - continuing operations			0
Interest income (expense), net of amounts capitalized			(150,145)
Gain (loss) on extinguishment of debt, net			(8,768)
Interest income and other, net			4,197
Loss from continuing operations before income taxes			(1,031,225)
Income tax benefit (provision)			35,737
Net loss			(995,488)
Net (income) loss attributable to noncontrolling interests			250,955
Net income (loss) attributable to the company			(744,533)
Other comprehensive loss, net			(1,455)
Comprehensive income (loss) attributable to the company			(745,988)
NDS6 | Reportable Legal Entities
Operating revenues
Revenue from contract with customer		0		0
Operating costs and expenses
Depreciation and amortization		0		0
General and administrative		5		9
Total operating costs and expenses		5		9
Operating income (loss)		(5)		(9)
Other income (expense)
Income (loss) of unconsolidated affiliates - continuing operations		5,647		56,266
Income (loss) of unconsolidated affiliates - discontinued operations, net of tax		0		0
Interest income (expense), net of amounts capitalized		(3,854)		(7,671)
Interest income and other, net		53,560		116,978
Loss from continuing operations before income taxes		55,348		165,564
Income tax benefit (provision)		0		0
Net loss from continuing operations		55,348		165,564
Net loss from discontinued operations, net of tax		0		0
Net loss		55,348		165,564
Net (income) loss attributable to noncontrolling interests		0		0
Net income (loss) attributable to the company		55,348		165,564
Other comprehensive loss, net		0		0
Comprehensive income (loss) attributable to the company		55,348		165,564
Noble Corp
Operating revenues
Revenue from contract with customer	258,369	278,142	493,526	641,118
Operating costs and expenses
Depreciation and amortization	128,173	134,633	255,812	270,351
General and administrative	8,121	13,231	21,578	22,295
Loss on impairment	792,843	0	792,843	0
Total operating costs and expenses	1,088,182	314,525	1,370,035	624,853
Operating income (loss)	(829,813)	(36,383)	(876,509)	16,265
Other income (expense)
Income (loss) of unconsolidated affiliates - continuing operations	0	0		0
Income (loss) of unconsolidated affiliates - discontinued operations, net of tax		0		0
Interest income (expense), net of amounts capitalized	(74,130)	(73,209)	(150,145)	(146,656)
Gain (loss) on extinguishment of debt, net	0	0	(8,768)	0
Interest income and other, net	2,851	3,138	4,197	4,641
Loss from continuing operations before income taxes	(901,092)	(106,454)	(1,031,225)	(125,750)
Income tax benefit (provision)	38,733	18,213	35,737	(239,160)
Net loss from continuing operations	(862,359)	(88,241)	(995,488)	(364,910)
Net loss from discontinued operations, net of tax	0	2,967	0	2,967
Net loss	(862,359)	(85,274)	(995,488)	(361,943)
Net (income) loss attributable to noncontrolling interests	249,969	4,343	250,955	(13,577)
Net income (loss) attributable to the company	(612,390)	(80,931)	(744,533)	(375,520)
Other comprehensive loss, net	(2,446)	1,318	(1,455)	1,786
Comprehensive income (loss) attributable to the company	(614,836)	(79,613)	(745,988)	(373,734)
Contract drilling services
Operating revenues
Revenue from contract with customer	247,689	271,532	476,795	626,191
Operating costs and expenses
Cost of services	151,437	162,781	288,286	323,550
Contract drilling services | Consolidating Adjustments
Operating revenues
Revenue from contract with customer	0	(9,944)	0	(27,113)
Operating costs and expenses
Cost of services	0	(9,944)	0	(27,113)
Contract drilling services | Other Non-guarantor Subsidiaries of Noble | Reportable Legal Entities
Operating revenues
Revenue from contract with customer	247,689	241,488	476,795	566,212
Operating costs and expenses
Cost of services	149,881	167,862	285,603	317,873
Contract drilling services | Noble-Cayman | Reportable Legal Entities
Operating revenues
Revenue from contract with customer	0	0	0	0
Operating costs and expenses
Cost of services	74	(866)	155	135
Contract drilling services | NHUS | Reportable Legal Entities
Operating revenues
Revenue from contract with customer		0		0
Operating costs and expenses
Cost of services		3,362		5,933
Contract drilling services | NDH | Reportable Legal Entities
Operating revenues
Revenue from contract with customer		39,988		87,092
Operating costs and expenses
Cost of services		12,687		24,186
Contract drilling services | NHIL | Reportable Legal Entities
Operating revenues
Revenue from contract with customer	0	0	0	0
Operating costs and expenses
Cost of services	793	(10,834)	1,397	1,653
Contract drilling services | NDS6
Operating revenues
Revenue from contract with customer			476,795
Operating costs and expenses
Cost of services			287,155
Contract drilling services | NDS6 | Reportable Legal Entities
Operating revenues
Revenue from contract with customer		0		0
Operating costs and expenses
Cost of services		0		0
Contract drilling services | Noble Corp
Operating revenues
Revenue from contract with customer	247,689	271,532	476,795	626,191
Operating costs and expenses
Cost of services	150,748	162,267	287,155	322,667
Reimbursables and other
Operating revenues
Revenue from contract with customer	10,680	6,610	16,731	14,927
Operating costs and expenses
Cost of services	8,297	4,394	12,647	9,540
Reimbursables and other | Consolidating Adjustments
Operating revenues
Revenue from contract with customer	0	0	0	0
Operating costs and expenses
Cost of services	0	0	0	0
Reimbursables and other | Other Non-guarantor Subsidiaries of Noble | Reportable Legal Entities
Operating revenues
Revenue from contract with customer	10,680	5,718	16,731	12,899
Operating costs and expenses
Cost of services	8,297	3,922	12,647	8,248
Reimbursables and other | Noble-Cayman | Reportable Legal Entities
Operating revenues
Revenue from contract with customer	0	0	0	0
Operating costs and expenses
Cost of services	0	0	0	0
Reimbursables and other | NHUS | Reportable Legal Entities
Operating revenues
Revenue from contract with customer		0		0
Operating costs and expenses
Cost of services		0		0
Reimbursables and other | NDH | Reportable Legal Entities
Operating revenues
Revenue from contract with customer		892		2,028
Operating costs and expenses
Cost of services		472		1,292
Reimbursables and other | NHIL | Reportable Legal Entities
Operating revenues
Revenue from contract with customer	0	0	0	0
Operating costs and expenses
Cost of services	0	0	0	0
Reimbursables and other | NDS6
Operating revenues
Revenue from contract with customer			16,731
Operating costs and expenses
Cost of services			12,647
Reimbursables and other | NDS6 | Reportable Legal Entities
Operating revenues
Revenue from contract with customer		0		0
Operating costs and expenses
Cost of services		0		0
Reimbursables and other | Noble Corp
Operating revenues
Revenue from contract with customer	10,680	6,610	16,731	14,927
Operating costs and expenses
Cost of services	$ 8,297	$ 4,394	$ 12,647	$ 9,540

Condensed Consolidating Finan64

Condensed Consolidating Financial Information - Cash Flows (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities
Net cash provided by operating activities	$ 53,894	$ 254,285
Cash flows from investing activities
Capital expenditures	(75,874)	(67,608)
Proceeds from disposal of assets, net	3,755	314
Net cash used in investing activities	(72,119)	(67,294)
Cash flows from financing activities
Issuance of senior notes	750,000	0
Repayment of long-term debt	(952,209)	(300,000)
Debt issuance costs on senior notes and credit facilities	(14,802)	(42)
Dividends paid to noncontrolling interests	(12,694)	(5,393)
Net cash used in financing activities	(233,112)	(309,736)
Net decrease in cash and cash equivalents	(251,337)	(122,745)
Cash and cash equivalents, beginning of period	662,829	725,722
Cash and cash equivalents, end of period	411,492	602,977
Consolidating Adjustments
Cash flows from operating activities
Net cash provided by operating activities	0	0
Cash flows from investing activities
Capital expenditures	0	0
Proceeds from disposal of assets, net	0	0
Net cash used in investing activities	0	0
Cash flows from financing activities
Issuance of senior notes	0
Repayment of long-term debt	0	0
Debt issuance costs on senior notes and credit facilities	0	0
Dividends paid to noncontrolling interests	0	0
Contributions from parent company, net		0
Distributions to parent company, net	0
Advances (to) from affiliates	0	0
Net cash used in financing activities	0	0
Net decrease in cash and cash equivalents	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period	0	0
Other Non-guarantor Subsidiaries of Noble | Reportable Legal Entities
Cash flows from operating activities
Net cash provided by operating activities	270,815	91,919
Cash flows from investing activities
Capital expenditures	(75,874)	(66,299)
Proceeds from disposal of assets, net	3,755	307
Net cash used in investing activities	(72,119)	(65,992)
Cash flows from financing activities
Issuance of senior notes	0
Repayment of long-term debt	(213,654)	0
Debt issuance costs on senior notes and credit facilities	(1,399)	0
Dividends paid to noncontrolling interests	(12,694)	(5,393)
Contributions from parent company, net		0
Distributions to parent company, net	0
Advances (to) from affiliates	(193,218)	(59,297)
Net cash used in financing activities	(420,965)	(64,690)
Net decrease in cash and cash equivalents	(222,269)	(38,763)
Cash and cash equivalents, beginning of period	632,676	640,441
Cash and cash equivalents, end of period	410,407	601,678
Noble-Cayman
Cash flows from investing activities
Proceeds from disposal of assets, net	0
Noble-Cayman | Reportable Legal Entities
Cash flows from operating activities
Net cash provided by operating activities	15,220	18,027
Cash flows from investing activities
Capital expenditures	0	0
Proceeds from disposal of assets, net		0
Net cash used in investing activities	0	0
Cash flows from financing activities
Issuance of senior notes	0
Repayment of long-term debt	0	0
Debt issuance costs on senior notes and credit facilities	(822)	0
Dividends paid to noncontrolling interests	0	0
Contributions from parent company, net		51,705
Distributions to parent company, net	(29,069)
Advances (to) from affiliates	14,925	(72,255)
Net cash used in financing activities	(14,966)	(20,550)
Net decrease in cash and cash equivalents	254	(2,523)
Cash and cash equivalents, beginning of period	11	2,537
Cash and cash equivalents, end of period	265	14
NHUS | Reportable Legal Entities
Cash flows from operating activities
Net cash provided by operating activities		128,277
Cash flows from investing activities
Capital expenditures		0
Proceeds from disposal of assets, net		0
Net cash used in investing activities		0
Cash flows from financing activities
Repayment of long-term debt		0
Debt issuance costs on senior notes and credit facilities		0
Dividends paid to noncontrolling interests		0
Contributions from parent company, net		0
Advances (to) from affiliates		(128,277)
Net cash used in financing activities		(128,277)
Net decrease in cash and cash equivalents		0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period		0
NDH | Reportable Legal Entities
Cash flows from operating activities
Net cash provided by operating activities		94,821
Cash flows from investing activities
Capital expenditures		(1,309)
Proceeds from disposal of assets, net		7
Net cash used in investing activities		(1,302)
Cash flows from financing activities
Repayment of long-term debt		0
Debt issuance costs on senior notes and credit facilities		0
Dividends paid to noncontrolling interests		0
Contributions from parent company, net		0
Advances (to) from affiliates		(104,255)
Net cash used in financing activities		(104,255)
Net decrease in cash and cash equivalents		(10,736)
Cash and cash equivalents, beginning of period	23,160	10,855
Cash and cash equivalents, end of period		119
NHIL
Cash flows from investing activities
Proceeds from disposal of assets, net	0
NHIL | Reportable Legal Entities
Cash flows from operating activities
Net cash provided by operating activities	(206,481)	(173,014)
Cash flows from investing activities
Capital expenditures	0	0
Proceeds from disposal of assets, net		0
Net cash used in investing activities	0	0
Cash flows from financing activities
Issuance of senior notes	750,000
Repayment of long-term debt	(738,555)	(300,000)
Debt issuance costs on senior notes and credit facilities	(12,581)	(42)
Dividends paid to noncontrolling interests	0	0
Contributions from parent company, net		0
Distributions to parent company, net	0
Advances (to) from affiliates	178,293	473,423
Net cash used in financing activities	177,157	173,381
Net decrease in cash and cash equivalents	(29,324)	367
Cash and cash equivalents, beginning of period	29,324	0
Cash and cash equivalents, end of period	0	367
NDS6 | Reportable Legal Entities
Cash flows from operating activities
Net cash provided by operating activities		109,339
Cash flows from investing activities
Capital expenditures		0
Proceeds from disposal of assets, net		0
Net cash used in investing activities		0
Cash flows from financing activities
Repayment of long-term debt		0
Debt issuance costs on senior notes and credit facilities		0
Dividends paid to noncontrolling interests		0
Contributions from parent company, net		0
Advances (to) from affiliates		(109,339)
Net cash used in financing activities		(109,339)
Net decrease in cash and cash equivalents		0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period		0
Noble Corp
Cash flows from operating activities
Net cash provided by operating activities	79,554	269,369
Cash flows from investing activities
Capital expenditures	(75,874)	(67,608)
Proceeds from disposal of assets, net	3,755	314
Net cash used in investing activities	(72,119)	(67,294)
Cash flows from financing activities
Issuance of senior notes	750,000	0
Repayment of long-term debt	(952,209)	(300,000)
Debt issuance costs on senior notes and credit facilities	(14,802)	(42)
Dividends paid to noncontrolling interests	(12,694)	(5,393)
Contributions from parent company, net		51,705
Distributions to parent company, net	(29,069)
Advances (to) from affiliates	0	0
Net cash used in financing activities	(258,774)	(253,730)
Net decrease in cash and cash equivalents	(251,339)	(51,655)
Cash and cash equivalents, beginning of period	662,011	653,833
Cash and cash equivalents, end of period	$ 410,672	$ 602,178

Uncategorized Items - ne-201806

Label	Element	Value
AOCI Attributable to Parent [Member] | Noble Corporation [Member]
Tax Cuts And Jobs Act Of 2017, Reclassification From Aoci To Retained Earnings, Tax Effect	ne_TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect	$ (5,540,000)
Retained Earnings [Member] | Noble Corporation [Member]
Tax Cuts And Jobs Act Of 2017, Reclassification From Aoci To Retained Earnings, Tax Effect	ne_TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect	$ 5,540,000