Noble (NE) 10-Q 2 Aug 19 2019 Q2 Quarterly report Financial data

Cover

Cover - shares	6 Months Ended
	Jun. 30, 2019	Jul. 31, 2019
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2019
Document Transition Report	false
Entity File Number	001-36211
Entity Registrant Name	Noble Corporation plc
Entity Incorporation, State or Country Code	X0
Entity Tax Identification Number	98-0619597
Entity Address, Address Line One	10 Brook Street
Entity Address, City or Town	London
Entity Address, Country	GB
Entity Address, Postal Zip Code	W1S1BG
Country Region	+44
City Area Code	20
Local Phone Number	3300 2300
Title of 12(b) Security	Ordinary Shares
Trading Symbol	NE
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		249,182,494
Entity Central Index Key	0001458891
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Amendment Flag	false
Noble Corp
Entity Information [Line Items]
Entity File Number	001-31306
Entity Registrant Name	Noble Corporation
Entity Incorporation, State or Country Code	E9
Entity Tax Identification Number	98-0366361
Entity Address, Address Line One	Suite 3D Landmark Square, 64 Earth Close
Entity Address, Address Line Two	P.O. Box 31327 George Town
Entity Address, City or Town	Grand Cayman
Entity Address, Country	KY
Entity Address, Postal Zip Code	KY1-1206
City Area Code	345
Local Phone Number	938-0293
No Trading Symbol Flag	false
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		261,245,693
Entity Central Index Key	0001169055

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 153,766	$ 375,232
Accounts receivable, net	222,889	200,722
Taxes receivable	25,682	20,498
Prepaid expenses and other current assets	59,757	62,604
Total current assets	462,094	659,056
Property and equipment, at cost	11,080,690	10,956,412
Accumulated depreciation	(2,621,100)	(2,475,694)
Property and equipment, net	8,459,590	8,480,718
Other assets	139,035	125,149
Total assets	9,060,719	9,264,923
Current liabilities
Current maturities of long-term debt	300,000	0
Accounts payable	118,040	125,557
Accrued payroll and related costs	40,722	50,284
Taxes payable	25,513	29,386
Interest payable	89,153	100,100
Other current liabilities	161,361	60,130
Total current liabilities	734,789	365,457
Long-term debt	3,553,088	3,877,402
Deferred income taxes	70,872	91,695
Other liabilities	274,221	275,795
Total liabilities	4,632,970	4,610,349
Commitments and contingencies
Shareholders’ equity
Common stock	2,492	2,468
Additional paid-in capital	704,511	699,409
Retained earnings	3,385,517	3,608,366
Accumulated other comprehensive loss	(55,871)	(57,072)
Total shareholders’ equity	4,036,649	4,253,171
Noncontrolling interests	391,100	401,403
Total equity	4,427,749	4,654,574
Total liabilities and equity	9,060,719	9,264,923
Noble Corp
Current assets
Cash and cash equivalents	153,703	374,375
Accounts receivable, net	222,889	200,722
Taxes receivable	25,682	20,498
Prepaid expenses and other current assets	59,659	61,917
Total current assets	461,933	657,512
Property and equipment, at cost	11,080,690	10,956,412
Accumulated depreciation	(2,621,100)	(2,475,694)
Property and equipment, net	8,459,590	8,480,718
Other assets	139,035	125,149
Total assets	9,060,558	9,263,379
Current liabilities
Current maturities of long-term debt	300,000	0
Accounts payable	117,812	125,237
Accrued payroll and related costs	40,733	50,284
Taxes payable	25,513	29,386
Interest payable	89,153	100,100
Other current liabilities	61,361	60,012
Total current liabilities	634,572	365,019
Long-term debt	3,553,088	3,877,402
Deferred income taxes	70,872	91,695
Other liabilities	274,221	275,795
Total liabilities	4,532,753	4,609,911
Commitments and contingencies
Shareholders’ equity
Common stock	26,125	26,125
Additional paid-in capital	654,969	647,082
Retained earnings	3,511,482	3,635,930
Accumulated other comprehensive loss	(55,871)	(57,072)
Total shareholders’ equity	4,136,705	4,252,065
Noncontrolling interests	391,100	401,403
Total equity	4,527,805	4,653,468
Total liabilities and equity	$ 9,060,558	$ 9,263,379

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Thousands	Jun. 30, 2019	Dec. 31, 2018
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Ordinary shares, shares outstanding	249,155	246,794
Noble Corp
Common stock, par value (usd per share)	$ 0.1	$ 0.1
Ordinary shares, shares outstanding	261,246	261,246

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Operating revenues
Revenue from contract with customer	$ 292,936	$ 258,369	$ 575,824	$ 493,526
Operating costs and expenses
Depreciation and amortization	111,148	129,681	220,726	258,436
General and administrative	116,252	21,717	132,251	43,800
Loss on impairment	0	792,843	0	792,843
Total operating costs and expenses	411,646	1,103,975	718,346	1,396,012
Operating loss	(118,710)	(845,606)	(142,522)	(902,486)
Other income (expense)
Interest expense, net of amounts capitalized	(68,976)	(74,130)	(139,220)	(150,145)
Gain (loss) on extinguishment of debt, net	0	0	31,266	(8,768)
Interest income and other, net	1,860	2,865	4,366	4,204
Loss from continuing operations before income taxes	(185,826)	(916,871)	(246,110)	(1,057,195)
Income tax benefit	37,182	38,839	34,317	35,843
Net loss from continuing operations	(148,644)	(878,032)	(211,793)	(1,021,352)
Net loss from discontinued operations, net of tax	0	0	(3,821)	0
Net loss	(148,644)	(878,032)	(215,614)	(1,021,352)
Net (income) loss attributable to noncontrolling interests	(3,316)	249,969	(7,235)	250,955
Net income (loss) attributable to the company	(151,960)	(628,063)	(222,849)	(770,397)
Net loss from continuing operations	(151,960)	(628,063)	(219,028)	(770,397)
Net loss from discontinued operations, net of tax	$ 0	$ 0	$ (3,821)	$ 0
Basic:
Loss from continuing operations (usd per share)	$ (0.61)	$ (2.55)	$ (0.88)	$ (3.13)
Loss from discontinued operations (usd per share)	0	0	(0.02)	0
Net income (loss) attributable to the company (usd per share)	(0.61)	(2.55)	(0.90)	(3.13)
Diluted:
Loss from continuing operations (usd per share)	(0.61)	(2.55)	(0.88)	(3.13)
Loss from discontinued operations (usd per share)	0	0	(0.02)	0
Net income (loss) (usd per share)	$ (0.61)	$ (2.55)	$ (0.90)	$ (3.13)
Noble Corp
Operating revenues
Revenue from contract with customer	$ 292,936	$ 258,369	$ 575,824	$ 493,526
Operating costs and expenses
Depreciation and amortization	110,538	128,173	219,310	255,812
General and administrative	8,672	8,121	16,267	21,578
Loss on impairment	0	792,843	0	792,843
Total operating costs and expenses	303,037	1,088,182	599,661	1,370,035
Operating loss	(10,101)	(829,813)	(23,837)	(876,509)
Other income (expense)
Interest expense, net of amounts capitalized	(68,976)	(74,130)	(139,220)	(150,145)
Gain (loss) on extinguishment of debt, net	0	0	31,266	(8,768)
Interest income and other, net	1,860	2,851	4,366	4,197
Loss from continuing operations before income taxes	(77,217)	(901,092)	(127,425)	(1,031,225)
Income tax benefit	37,182	38,733	34,317	35,737
Net loss from continuing operations	(40,035)	(862,359)	(93,108)	(995,488)
Net loss from discontinued operations, net of tax	0	0	(3,821)	0
Net loss	(40,035)	(862,359)	(96,929)	(995,488)
Net (income) loss attributable to noncontrolling interests	(3,316)	249,969	(7,235)	250,955
Net income (loss) attributable to the company	(43,351)	(612,390)	(104,164)	(744,533)
Contract drilling services
Operating revenues
Revenue from contract with customer	274,817	247,689	545,318	476,795
Operating costs and expenses
Cost of services	168,865	151,437	340,593	288,286
Contract drilling services | Noble Corp
Operating revenues
Revenue from contract with customer	274,817	247,689	545,318	476,795
Operating costs and expenses
Cost of services	168,446	150,748	339,308	287,155
Reimbursables and other
Operating revenues
Revenue from contract with customer	18,119	10,680	30,506	16,731
Operating costs and expenses
Cost of services	15,381	8,297	24,776	12,647
Reimbursables and other | Noble Corp
Operating revenues
Revenue from contract with customer	18,119	10,680	30,506	16,731
Operating costs and expenses
Cost of services	$ 15,381	$ 8,297	$ 24,776	$ 12,647

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net loss	$ (148,644)	$ (878,032)	$ (215,614)	$ (1,021,352)
Other comprehensive income (loss)
Foreign currency translation adjustments	(406)	(2,771)	102	(2,104)
Amortization of deferred pension plan amounts (net of tax provision of $146 and $86 for the three months ended June 30, 2019 and 2018, respectively, and $291 and $173 for the six months ended June 30, 2019 and 2018, respectively)	549	325	1,099	649
Other comprehensive income (loss), net	143	(2,446)	1,201	(1,455)
Net comprehensive (income) loss attributable to noncontrolling interests	(3,316)	249,969	(7,235)	250,955
Comprehensive income (loss) attributable to the company	(151,817)	(630,509)	(221,648)	(771,852)
Noble Corp
Net loss	(40,035)	(862,359)	(96,929)	(995,488)
Other comprehensive income (loss)
Foreign currency translation adjustments	(406)	(2,771)	102	(2,104)
Amortization of deferred pension plan amounts (net of tax provision of $146 and $86 for the three months ended June 30, 2019 and 2018, respectively, and $291 and $173 for the six months ended June 30, 2019 and 2018, respectively)	549	325	1,099	649
Other comprehensive income (loss), net	143	(2,446)	1,201	(1,455)
Net comprehensive (income) loss attributable to noncontrolling interests	(3,316)	249,969	(7,235)	250,955
Comprehensive income (loss) attributable to the company	$ (43,208)	$ (614,836)	$ (102,963)	$ (745,988)

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Amortization of deferred pension plan, tax provision	$ 146	$ 86	$ 291	$ 173
Noble Corp
Amortization of deferred pension plan, tax provision	$ 146	$ 86	$ 291	$ 173

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities
Net loss	$ (215,614)	$ (1,021,352)
Adjustments to reconcile net loss to net cash flow from operating activities:
Depreciation and amortization	220,726	258,436
Loss on impairment	0	792,843
(Gain) loss on extinguishment of debt, net	(31,266)	8,768
Deferred income taxes	(4,741)	(51,724)
Amortization of share-based compensation	7,911	12,735
Other costs, net	62,925	3,226
Change in taxes receivable	2,758	84,486
Net changes in other operating assets and liabilities	(50,161)	(33,524)
Net cash provided by operating activities	(7,462)	53,894
Cash flows from investing activities
Capital expenditures	(152,354)	(75,874)
Proceeds from disposal of assets, net	9,367	3,755
Net cash used in investing activities	(142,987)	(72,119)
Cash flows from financing activities
Issuance of senior notes	0	750,000
Borrowings on credit facilities	370,000	0
Repayments of credit facilities	(20,000)	0
Repayments of debt	(400,000)	(952,209)
Debt issuance costs	(90)	(14,802)
Dividends paid to noncontrolling interests	(17,538)	(12,694)
Taxes withheld on employee stock transactions	(2,761)	(3,407)
Net cash used in financing activities	(70,389)	(233,112)
Net decrease in cash, cash equivalents and restricted cash	(220,838)	(251,337)
Cash, cash equivalents and restricted cash, beginning of period	375,907	662,829
Cash, cash equivalents and restricted cash, end of period	155,069	411,492
Noble Corp
Cash flows from operating activities
Net loss	(96,929)	(995,488)
Adjustments to reconcile net loss to net cash flow from operating activities:
Depreciation and amortization	219,310	255,812
Loss on impairment	0	792,843
(Gain) loss on extinguishment of debt, net	(31,266)	8,768
Deferred income taxes	(4,741)	(51,724)
Amortization of share-based compensation	7,887	12,711
Other costs, net	(37,075)	3,226
Change in taxes receivable	2,758	84,486
Net changes in other operating assets and liabilities	(49,089)	(31,080)
Net cash provided by operating activities	10,855	79,554
Cash flows from investing activities
Capital expenditures	(152,354)	(75,874)
Proceeds from disposal of assets, net	9,367	3,755
Net cash used in investing activities	(142,987)	(72,119)
Cash flows from financing activities
Issuance of senior notes	0	750,000
Borrowings on credit facilities	370,000	0
Repayments of credit facilities	(20,000)	0
Repayments of debt	(400,000)	(952,209)
Debt issuance costs	(90)	(14,802)
Dividends paid to noncontrolling interests	(17,538)	(12,694)
Distributions to parent company, net	(20,284)	(29,069)
Net cash used in financing activities	(87,912)	(258,774)
Net decrease in cash, cash equivalents and restricted cash	(220,044)	(251,339)
Cash, cash equivalents and restricted cash, beginning of period	375,050	662,011
Cash, cash equivalents and restricted cash, end of period	$ 155,006	$ 410,672

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Equity - USD ($) $ in Thousands		Total	Parent	Common stock and additional paid-in capital:	Retained earnings:	Accumulated other comprehensive income (loss):	Noncontrolling interests:	Noble Corp	Noble CorpParent	Noble CorpCommon stock and additional paid-in capital:	Noble CorpRetained earnings:	Noble CorpAccumulated other comprehensive income (loss):	Noble CorpNoncontrolling interests:
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effects of changes in accounting principles					$ (144,341)	$ (5,540)					$ (144,341)	$ (5,540)
Beginning Balance at Dec. 31, 2017		$ 5,950,628		$ 681,372	4,637,677	(42,888)	$ 674,467	$ 5,950,014		$ 649,262	4,669,173	(42,888)	$ 674,467
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income, net		991
Ending Balance at Mar. 31, 2018		5,658,842		684,347	4,351,118	(47,437)	670,814	5,658,292		655,544	4,379,371	(47,437)	670,814
Beginning Balance at Dec. 31, 2017		5,950,628		681,372	4,637,677	(42,888)	674,467	5,950,014		649,262	4,669,173	(42,888)	674,467
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amortization of share-based compensation				12,735
Shares withheld for taxes on equity transactions				(3,425)
Capital contribution by parent - share based compensation										12,711
Net loss		(1,021,352)			(770,397)		(250,955)	(995,488)			(744,533)		(250,955)
Dividend equivalents	[1]				39
Distributions to parent company, net											(29,069)
Other comprehensive income, net		(1,455)				(1,455)		(1,455)				(1,455)
Dividends paid to noncontrolling interests							(12,694)						(12,694)
Ending Balance at Jun. 30, 2018		4,774,595	$ 4,363,777	690,682	3,722,978	(49,883)	410,818	4,774,138	$ 4,363,320	661,973	3,751,230	(49,883)	410,818
Beginning Balance at Mar. 31, 2018		5,658,842		684,347	4,351,118	(47,437)	670,814	5,658,292		655,544	4,379,371	(47,437)	670,814
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amortization of share-based compensation				6,453
Issuance of share-based compensation shares				(12)
Shares withheld for taxes on equity transactions				(106)
Capital contribution by parent - share based compensation										6,429
Net loss		(878,032)			(628,063)			(862,359)			(612,390)		(249,969)
Dividend equivalents	[1]				(77)
Distributions to parent company, net											(15,751)
Other comprehensive income, net		(2,446)				(2,446)		(2,446)				(2,446)
Dividends paid to noncontrolling interests							(10,027)						(10,027)
Ending Balance at Jun. 30, 2018		4,774,595	4,363,777	690,682	3,722,978	(49,883)	410,818	4,774,138	4,363,320	661,973	3,751,230	(49,883)	410,818
Beginning Balance at Dec. 31, 2018		4,654,574		701,877	3,608,366	(57,072)	401,403	4,653,468		673,207	3,635,930	(57,072)	401,403
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income, net		1,058
Ending Balance at Mar. 31, 2019		4,583,808		702,043	3,537,477	(56,014)	400,302	4,583,475		676,147	3,563,040	(56,014)	400,302
Beginning Balance at Dec. 31, 2018		4,654,574		701,877	3,608,366	(57,072)	401,403	4,653,468		673,207	3,635,930	(57,072)	401,403
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amortization of share-based compensation				7,911
Shares withheld for taxes on equity transactions				(2,785)
Capital contribution by parent - share based compensation										7,887
Net loss		(215,614)			(222,849)		7,235	(96,929)			(104,164)		7,235
Distributions to parent company, net											(20,284)
Other comprehensive income, net		1,201				1,201		1,201				1,201
Dividends paid to noncontrolling interests							(17,538)						(17,538)
Ending Balance at Jun. 30, 2019		4,427,749	4,036,649	707,003	3,385,517	(55,871)	391,100	4,527,805	4,136,705	681,094	3,511,482	(55,871)	391,100
Beginning Balance at Mar. 31, 2019		4,583,808		702,043	3,537,477	(56,014)	400,302	4,583,475		676,147	3,563,040	(56,014)	400,302
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amortization of share-based compensation				4,959
Shares withheld for taxes on equity transactions				1
Capital contribution by parent - share based compensation										4,947
Net loss		(148,644)			(151,960)		3,316	(40,035)			(43,351)		3,316
Distributions to parent company, net											(8,207)
Other comprehensive income, net		143				143		143				143
Dividends paid to noncontrolling interests							(12,518)						(12,518)
Ending Balance at Jun. 30, 2019		$ 4,427,749	$ 4,036,649	$ 707,003	$ 3,385,517	$ (55,871)	$ 391,100	$ 4,527,805	$ 4,136,705	$ 681,094	$ 3,511,482	$ (55,871)	$ 391,100
[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, 2019
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, 2019 , our fleet consisted of 12 floaters (consisting of four semisubmersibles and eight drillships) and 13 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, 2018 Condensed Consolidated Balance Sheets presented herein are derived from the December 31, 2018 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, 2018 , 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. Beginning in 2019 , we combined the semisubmersibles and drillships in our contract drilling services fleet into a single category, “floaters” for reporting purposes. We have made certain reclassifications so as to conform to such current period presentation. The reclassification did not have a material effect on our Condensed Consolidated Statements of Operations or related disclosures.

Accounting Pronouncements

Accounting Pronouncements	6 Months Ended
	Jun. 30, 2019
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Accounting Pronouncements	Note 2— Accounting Pronouncements Accounting Standards Adopted In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2016-02 (Topic 842, “Leases”), as amended, which generally requires lessees to recognize operating and financing lease liabilities and corresponding right-of-use assets on the balance sheet and to provide enhanced disclosures surrounding the amount, time and uncertainty of cash flows arising from lease agreements. We adopted this standard, on a modified retrospective basis, effective January 1, 2019 and did not restate comparative periods. Our adoption did not have a material effect on our condensed consolidated financial statements. With respect to leases in which we are the lessee, we recognized a lease liability and a corresponding right-of-use asset of approximately $28.0 million as of January 1, 2019. We have elected the package of practical expedients that permits us to not reassess (1) whether previously expired or existing contracts are or contain leases, (2) the lease classification for any expired or existing leases, and (3) any initial direct costs for any existing leases as of the effective date. In addition, we have elected the hindsight practical expedient in connection with our adoption of the new lease standard. As lessee, we have made the accounting policy election to not recognize a right-of-use asset lease and lease liability for leases with a term of 12 months or less. We will recognize lease payments in the Consolidated Statements of Operations on a straight-line basis over the lease term. We have also elected the practical expedient to not separate lease and non-lease components. Our drilling contracts contain a lease component related to the underlying drilling equipment, in addition to the service component provided by our crews and our expertise to operate such drilling equipment. We have concluded the non-lease service of operating our equipment and providing expertise in the drilling of the client’s well is predominant in our drilling contracts. We have applied the practical expedient to account for the lease and associated non-lease components as a single component. With the election of the practical expedient, we will continue to present a single performance obligation under the new revenue guidance in Accounting Standards Codification (“ASC”) Topic 606, “Revenue from Contracts with Customers.” Issued Accounting Standards 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, 2019
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 three and six months ended June 30, 2019 , the Bully joint ventures approved and paid dividends totaling $25.0 million and $35.1 million , respectively. During the three and six months ended June 30, 2018 , the Bully joint ventures approved and paid dividends totaling $20.1 million and $25.4 million , respectively. Of these amounts, 50 percent was paid to our joint venture partner. The combined carrying amount of the Bully -class drillships at both June 30, 2019 and December 31, 2018 totaled $0.7 billion . These assets were primarily funded through partner equity contributions. Cash held by the Bully joint ventures totaled approximately $28.8 million at June 30, 2019 as compared to approximately $45.2 million at December 31, 2018 .

Loss Per Share

Loss Per Share	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Loss Per Share	Note 4— Loss Per Share The following table presents the computation of basic and diluted loss per share for Noble-UK: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Numerator: Basic Net loss from continuing operations $ (151,960 ) $ (628,063 ) $ (219,028 ) $ (770,397 ) Net loss from discontinued operations, net of tax — — (3,821 ) — Net loss attributable to Noble Corporation plc $ (151,960 ) $ (628,063 ) $ (222,849 ) $ (770,397 ) Diluted Net loss from continuing operations $ (151,960 ) $ (628,063 ) $ (219,028 ) $ (770,397 ) Net loss from discontinued operations, net of tax — — (3,821 ) — Net loss attributable to Noble Corporation plc $ (151,960 ) $ (628,063 ) $ (222,849 ) $ (770,397 ) Denominator: Weighted average shares outstanding - basic 249,154 246,740 248,705 246,438 Weighted average shares outstanding - diluted 249,154 246,740 248,705 246,438 Loss per share Basic: Loss from continuing operations $ (0.61 ) $ (2.55 ) $ (0.88 ) $ (3.13 ) Loss from discontinued operations — — (0.02 ) — Net loss attributable to Noble Corporation plc $ (0.61 ) $ (2.55 ) $ (0.90 ) $ (3.13 ) Diluted: Loss from continuing operations $ (0.61 ) $ (2.55 ) $ (0.88 ) $ (3.13 ) Loss from discontinued operations — — (0.02 ) — Net loss attributable to Noble Corporation plc $ (0.61 ) $ (2.55 ) $ (0.90 ) $ (3.13 ) Only those items having a dilutive impact on our basic loss per share are included in diluted loss per share. For the three and six months ended June 30, 2019 and 2018, approximately 13.4 million share-based awards were excluded from diluted loss per share since the effect would have been anti-dilutive. Share capital As of June 30, 2019 , Noble-UK had approximately 249.2 million shares outstanding and trading as compared to approximately 246.8 million shares outstanding and trading at December 31, 2018 . At our 2019 Annual General Meeting, shareholders approved a proposal to allow our Board of Directors to increase share capital through the issuance of up to approximately 83.1 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 2020 Annual General Meeting unless we seek an extension from shareholders at that time. No shares were allotted during the six months ended June 30, 2019 . 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. Therefore, Noble-UK is not permitted to pay dividends out of share capital, which includes share premium. 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. During the six months ended June 30, 2019 and 2018, we did not repurchase any of our shares.

Property and Equipment

Property and Equipment	6 Months Ended
	Jun. 30, 2019
Property, Plant and Equipment [Abstract]
Property and Equipment	Note 5— Property and Equipment Property and equipment, at cost, for Noble-UK consisted of the following: June 30, 2019 December 31, 2018 Drilling equipment and facilities $ 10,685,462 $ 10,546,376 Construction in progress 192,966 209,091 Other 202,262 200,945 Property and equipment, at cost $ 11,080,690 $ 10,956,412 On February 28, 2019, we purchased another GustoMSC CJ46 rig, the Noble Joe Knight. We paid $83.8 million for the rig, with $30.2 million paid in cash and the remaining $53.6 million of the purchase price financed with a loan by the seller, PaxOcean Group (“PaxOcean”). See “ Note 6— Debt

Debt

Debt	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Debt	Note 6— Debt Credit Facilities 2015 Credit Facility We have a $300 million 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”). In January 2018, in connection with entering into the 2017 Credit Facility (as defined herein), we amended the 2015 Credit Facility, which caused, among other things, a reduction in the aggregate principal amount of commitments under the 2015 Credit Facility. 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 . Borrowings under the 2015 Credit Facility bear interest at the London inter-bank offered rate (“LIBOR”) plus an applicable margin, which is currently the maximum contractual rate of 1.65% . At June 30, 2019 , we had $300.0 million of 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; Noble International Finance Company, a Cayman Islands company and a wholly-owned indirect subsidiary of Noble-Cayman; 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 on June 30, 2019 was approximately $1.5 billion . 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. The 2017 Credit Facility will mature in January 2023. 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. Borrowing under the 2017 Credit Facility bear interest at LIBOR plus an applicable margin, which is currently the maximum contractual rate of 4.25% . At June 30, 2019 , we had $50.0 million of borrowings outstanding under the 2017 Credit Facility, plus $3.4 million of performance letters of credit. 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, 2019 , the interest rates and fees in effect under our Credit Facilities were the highest permitted interest rates under those agreements. On July 26, 2019, we executed an amendment to our 2017 Credit Facility. See “ Note 16— Subsequent Events ” for additional information. 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 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. Seller Loans 2019 Seller Loan In February 2019, we purchased the Noble Joe Knight for $83.8 million with a $53.6 million seller-financed secured loan (the “2019 Seller Loan”). The 2019 Seller Loan has a term of four years and requires a 5% principal payment at the end of the third year with the remaining 95% of the principal due at the end of the term. The 2019 Seller Loan bears a cash interest rate of 4.25% and the equivalent of a 1.25% interest rate paid-in-kind over the four -year term of the 2019 Seller Loan. Based on the terms of the 2019 Seller Loan, the 1.25% paid-in-kind interest rate is accelerated into the first year, resulting in an overall first year interest rate of 8.91% , of which only 4.25% is payable in cash. Thereafter, the paid-in-kind interest ends and the cash interest rate of 4.25% is payable for the remainder of the term. 2018 Seller Loan In September 2018, we purchased the Noble Johnny Whitstine for $93.8 million with a $60.0 million seller-financed secured loan (the “2018 Seller Loan” and, together with the 2019 Seller Loan, the “Seller Loans”). The 2018 Seller Loan has a term of four years and requires a 5% principal payment at the end of the third year with the remaining 95% of the principal due at the end of the term. The 2018 Seller Loan bears a cash interest rate of 4.25% and the equivalent of a 1.25% interest rate paid-in-kind over the four -year term of the 2018 Seller Loan. Based on the terms of the 2018 Seller Loan, the 1.25% paid-in-kind interest rate is accelerated into the first year, resulting in an overall first year interest rate of 8.91% , of which only 4.25% is payable in cash. Thereafter, the paid-in-kind interest ends and the cash interest rate of 4.25% is payable for the remainder of the term. Both of the Seller Loans are guaranteed by Noble-Cayman and each is secured by a mortgage on the applicable rig and by the pledge of the shares of the applicable single-purpose entity that owns the relevant rig. Each Seller Loan contains debt to total capitalization ratio and minimum liquidity financial covenants substantially similar to the 2017 Credit Facility, and an asset and revenue covenant substantially similar to the 2026 Notes as well as other covenants and provisions customarily found in secured transactions, including a cross default provision. Each Seller Loan requires immediate repayment on the occurrence of certain events, including the termination of the drilling contract associated with the relevant rig. Senior Notes Interest Rate Adjustments Our Senior Notes due 2025 and our Senior Notes due 2045 are subject to provisions that vary the applicable interest rates based on our debt rating. 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, Repayments, and Open Market Repurchases In March 2019, we completed cash tender offers for our Senior Notes due 2020 (the “2020 Notes”), Senior Notes due 2021 (the “2021 Notes”), Senior Notes due 2022 (the “2022 Notes”) and Senior Notes due 2024 (the “2024 Notes”). Pursuant to such tender offers, we purchased $440.9 million aggregate principal amount of these senior notes for $400.0 million , plus accrued interest, using cash on hand and borrowings under the 2015 Credit Facility. As a result of this transaction, we recognized a net gain of approximately $31.3 million . In October 2018, we purchased $27.4 million aggregate principal amount of various tranches of our senior notes for approximately $20.2 million , plus accrued interest, as open market repurchases and recognized a net gain of approximately $6.9 million . In August 2018, we purchased $0.4 million aggregate principal amount of our Senior Notes due 2042 for approximately $0.3 million , plus accrued interest, as open market repurchases and recognized a net gain of approximately $0.1 million . In March 2018, we repaid the remaining aggregate principal amount of $126.6 million of our Senior Notes due 2018 (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 . In February 2018, we redeemed the remaining principal amount of $61.9 million of our Senior Notes due 2019 (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 February 2018, we completed cash tender offers for the 2018 Notes, the 2019 Notes, the 2020 Notes, the 2021 Notes, the 2022 Notes and the 2024 Notes. Pursuant to such tender offers, 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 . Covenants At June 30, 2019 , the 2017 Credit Facility contained 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 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, certain indirect subsidiaries of Noble-UK that own rigs are guarantors under the 2017 Credit Facility. 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. 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. In addition to the covenants from the Credit Facilities noted above, the covenants from the 2026 Notes described under “—Debt Issuance” above, and the covenants from the Seller Loans described under “—Seller Loans” 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. There are also restrictions on incurring or assuming certain liens and on entering into sale and lease-back transactions. At June 30, 2019 , our debt to total tangible capitalization ratio under our 2017 Credit Facility was approximately 0.48 and we were in compliance with all applicable debt covenants. We continually monitor compliance with the covenants under our Credit Facilities, senior notes and Seller Loans and expect to remain in compliance throughout 2019 . 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 debt instruments 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). The carrying amount of the Credit Facilities approximates fair value as the interest rates are variable and reflective of market rates. All remaining fair value disclosures are presented in “ Note 12— 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, 2019 December 31, 2018 Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Senior unsecured notes: 4.90% Senior Notes due August 2020 $ 62,480 $ 59,107 $ 65,810 $ 60,177 4.625% Senior Notes due March 2021 79,821 76,114 92,967 84,931 3.95% Senior Notes due March 2022 21,175 18,564 41,617 37,096 7.75% Senior Notes due January 2024 389,067 305,300 783,350 613,719 7.95% Senior Notes due April 2025 446,735 325,103 446,517 339,035 7.875% Senior Notes due February 2026 738,710 643,710 738,075 647,085 6.20% Senior Notes due August 2040 390,489 214,754 390,454 245,242 6.05% Senior Notes due March 2041 389,750 214,216 389,693 247,171 5.25% Senior Notes due March 2042 478,058 256,246 477,996 277,056 8.95% Senior Notes due April 2045 390,716 262,236 390,672 311,392 Seller loans: Seller-financed secured loan due September 2022 61,732 56,619 60,251 57,902 Seller-financed secured loan due February 2023 54,355 46,779 — — Credit facilities: 2015 Credit Facility matures January 2020 300,000 300,000 — — 2017 Credit Facility matures January 2023 50,000 50,000 — — Total debt 3,853,088 2,828,748 3,877,402 2,920,806 Less: Current maturities of long-term debt (300,000 ) (300,000 ) — — Long-term debt $ 3,553,088 $ 2,528,748 $ 3,877,402 $ 2,920,806

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	6 Months Ended
	Jun. 30, 2019
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	Note 7— Accumulated Other Comprehensive Income (Loss) The following table presents the changes in the accumulated balances for each component of “Accumulated other comprehensive income (loss)” (“AOCI”) for the three and six months ended June 30, 2019 and 2018 . All amounts within the table are shown net of tax. Defined Benefit Pension Items (1) Foreign Currency Items Total Balance at December 31, 2017 $ (27,603 ) $ (15,285 ) $ (42,888 ) Activity during period: Stranded tax effect resulting from the Tax Cuts and Jobs Act (5,540 ) — (5,540 ) Balance at January 1, 2018 (33,143 ) (15,285 ) (48,428 ) Activity during period: Other comprehensive income (loss) before reclassifications — 667 667 Amounts reclassified from AOCI 324 — 324 Net other comprehensive income 324 667 991 Balance at March 31, 2018 (32,819 ) (14,618 ) (47,437 ) Activity during period: Other comprehensive income (loss) before reclassifications — (2,771 ) (2,771 ) Amounts reclassified from AOCI 325 — 325 Net other comprehensive income 325 (2,771 ) (2,446 ) Balance at June 30, 2018 $ (32,494 ) $ (17,389 ) $ (49,883 ) Balance at December 31, 2018 $ (39,058 ) $ (18,014 ) $ (57,072 ) Activity during period: Other comprehensive income (loss) before reclassifications — 508 508 Amounts reclassified from AOCI 550 — 550 Net other comprehensive income (loss) 550 508 1,058 Balance at March 31, 2019 (38,508 ) (17,506 ) (56,014 ) Activity during period: Other comprehensive income (loss) before reclassifications — (406 ) (406 ) Amounts reclassified from AOCI 549 — 549 Net other comprehensive income (loss) 549 (406 ) 143 Balance at June 30, 2019 $ (37,959 ) $ (17,912 ) $ (55,871 ) (1) Defined benefit pension items relate to actuarial changes. Reclassifications from AOCI are recognized as expense on our Condensed Consolidated Statements of Operations through “Other income (expense).” See “ Note 11— Employee Benefit Plans ” for additional information.

Revenue and Customers

Revenue and Customers	6 Months Ended
	Jun. 30, 2019
Revenue from Contract with Customer [Abstract]
Revenue and Customers	Note 8— Revenue and Customers 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, 2019 December 31, 2018 Current contract assets $ 21,635 $ 25,298 Noncurrent contract assets 18,484 22,366 Total contract assets 40,119 47,664 Current contract liabilities (deferred revenue) (31,063 ) (32,906 ) Noncurrent contract liabilities (deferred revenue) (46,740 ) (47,847 ) Total contract liabilities $ (77,803 ) $ (80,753 ) Significant changes in the remaining performance obligation contract assets and the contract liabilities balances for the six months ended June 30, 2019 are as follows: Contract Assets Contract Liabilities Net balance at December 31, 2018 $ 47,664 $ (80,753 ) Amortization of deferred costs (16,811 ) — Additions to deferred costs 9,266 — Amortization of deferred revenue — 28,907 Additions to deferred revenue — (25,957 ) Total (7,545 ) 2,950 Net balance at June 30, 2019 $ 40,119 $ (77,803 ) 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 June 30, 2019 2019 2020 2021 2022 2023 and beyond Total Floaters $ 8,848 $ 16,466 $ 15,742 $ 9,248 $ 3,566 $ 53,870 Jackups 8,270 9,260 5,605 798 — 23,933 Total $ 17,118 $ 25,726 $ 21,347 $ 10,046 $ 3,566 $ 77,803 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, 2019 . 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. Disaggregation of Revenue The following table provides information about contract drilling revenue by rig types: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Floaters $ 144,079 $ 134,079 $ 297,233 $ 254,715 Jackups 130,738 113,610 248,085 222,080 Total $ 274,817 $ 247,689 $ 545,318 $ 476,795

Leases

Leases	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Leases	Note 9— Leases Leases We determine if an arrangement is a lease at inception. Our operating lease agreements are primarily for real estate, equipment, storage, dock space and automobiles and are included within “Other current liabilities,” “Other assets” and “Other liabilities,” respectively, on our Condensed Consolidated Balance Sheets. As most of our leases do not provide an implicit rate, we use our incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. Certain of our lease agreements include options to extend or terminate the lease, which we do not include in our minimum lease terms unless management is reasonably certain to exercise. Supplemental balance sheet information related to leases was as follows: June 30, 2019 Operating Leases Operating lease right-of-use assets $ 28,895 Current operating lease liabilities 4,674 Long-term operating lease liabilities 23,759 Weighted average remaining lease term for operating leases (years) 8.8 Weighted average discounted rate for operating leases 9.6 % The components of lease cost were as follows: Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 Operating lease cost $ 1,714 $ 3,573 Short-term lease cost 2,357 4,409 Variable lease cost 216 745 Total lease cost $ 4,287 $ 8,727 Supplemental cash flow information related to leases was as follows: Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 1,641 $ 3,841 Maturities of lease liabilities as of June 30, 2019 were as follows: Operating Leases 2019 (remainder) $ 3,403 2020 6,634 2021 4,930 2022 3,867 2023 3,473 Thereafter 22,421 Total lease payments 44,728 Less: Interest (16,295 ) Present value of lease liability $ 28,433

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Note 10— Income Taxes At June 30, 2019 , the reserves for uncertain tax positions totaled $161.6 million (net of related tax benefits of $1.0 million ). At December 31, 2018 , the reserves for uncertain tax positions totaled $183.8 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, adjustments to reserves as a result of new facts including but not limited to information obtained as a result of previously closed 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, 2019, our income tax provision included a net tax benefit of $33.7 million following the effective settlement of the examination of our U.S. tax returns for the taxable years ended December 31, 2010 and 2011. 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.

Employee Benefit Plans

Employee Benefit Plans	6 Months Ended
	Jun. 30, 2019
Retirement Benefits [Abstract]
Employee Benefit Plans	Note 11— Employee Benefit Plans Pension costs include the following components for the three and six months ended June 30, 2019 and 2018 : Three Months Ended June 30, 2019 2018 Non-U.S. U.S. Non-U.S. U.S. Interest cost $ 431 $ 2,178 $ 354 $ 2,044 Return on plan assets (614 ) (2,579 ) (710 ) (2,978 ) Recognized net actuarial loss 2 693 — 411 Net pension benefit cost (gain) $ (181 ) $ 292 $ (356 ) $ (523 ) Six Months Ended June 30, 2019 2018 Non-U.S. U.S. Non-U.S. U.S. Interest cost $ 876 $ 4,356 $ 819 $ 4,089 Return on plan assets (1,248 ) (5,157 ) (1,426 ) (5,957 ) Recognized net actuarial loss 5 1,385 — 822 Net pension benefit cost (gain) $ (367 ) $ 584 $ (607 ) $ (1,046 ) During the three and six months ended June 30, 2019 and 2018 , we made no contributions to our pension plans. Effective December 31, 2016, employees and alternate payees accrue no future benefits under the U.S. plans and, as such, Noble recognized no service costs with the plans for the three and six months ended June 30, 2019 and 2018 .

Fair Value of Financial Instrum

Fair Value of Financial Instruments	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Note 12— 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, 2019 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 $ 7,675 $ 7,675 $ — $ — December 31, 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 $ 8,659 $ 8,659 $ — $ — Our cash, cash equivalents and restricted cash, accounts receivable, marketable securities and accounts payable are by their nature short-term. As a result, the carrying values included in our Condensed Consolidated Balance Sheets approximate fair value.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 13— Commitments and Contingencies Transocean Ltd. In January 2017, a subsidiary of Transocean Ltd. (“Transocean”) filed suit against us and certain of our subsidiaries seeking damages for patent infringement in a Texas federal court and Transocean later added another claim alleging that we breached a 2007 settlement agreement we entered into with Transocean relating to patent claims in respect of another Noble rig. 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, and Transocean is seeking royalties of a $10.0 million fee and a five percent license fee for the pertinent period of operation for each vessel and damages for the breach of contract. The patents expired in the United States in May 2016 and are also expired in most other countries. We were aware of the patents when we constructed the rigs, and while there is inherent risk in litigation, we do not believe that our rigs infringe the Transocean patents or that there has been any breach of the 2007 agreement. The litigation continues, and the court has set a trial date in November 2019. We continue to defend ourselves vigorously against this claim. 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 and cooperated with the SEC, the Brazilian federal prosecutor’s office and the U.S. Department of Justice (“DOJ”) about this matter and in December 2018, the SEC and the DOJ each advised us that they had closed their file on this matter. We have remained in contact with the Brazilian federal prosecutor’s office, who is aware of our internal review, and we continue to cooperate with any questions or requests they may have. 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 plc (“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 create and fund a 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. The complaint states that the litigation trust is seeking damages of approximately $1.7 billion from the Company, an amount equal to the amount borrowed by Paragon Offshore immediately prior to the Spin-off, as well as unspecified amounts in respect of the claims against the officer and director defendants all of whom have indemnification arrangements with us. Discovery continues and the court has set a litigation schedule which would result in all pre-trial activity being completed by the end of May 2020. A trial date has not yet been set. 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. However, the Company continually assesses potential outcomes, including the probability of the parties ultimately resolving the matter through settlement in light of various factors, including given the complex factual issues involved, the uncertainty and risk inherent in this type of litigation, the time commitment and distraction of our organization, the potential effect of the ongoing litigation and uncertainty on our business, and the substantial expense incurred in litigating the claims. As such, the Company's current estimated loss related to the final disposition of this matter is $100.0 million , which the Company has recorded as a general and administrative expense for the three and six months ended June 30, 2019 and is reflected as a current liability as of June 30, 2019 . As pre-trial matters progress, the Company's estimated loss could change, and that change could be material. There is inherent risk and substantial expense in litigation, and the amount of damages that 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 in excess of the amount we recognized at June 30, 2019, could be substantial and could have a material adverse effect on our business, financial condition and results of operations. Given the risks and considerations discussed above, we cannot predict with any degree of certainty what the outcome of the litigation may be. Furthermore, as discussed below, we cannot predict the amount of insurance coverage, if any, that we may have if we were to settle or be found liable in the litigation. We have directors’ and officers’ indemnification coverage for the officers and directors who have been sued by the litigation trust. The insurers have accepted coverage for the director and officer claims and we are continuing to discuss with them the scope of their reimbursement of litigation expenses. In addition, at the time of the Spin-off, we had entity coverage, or “Side C” coverage, which was meant to cover certain litigation claims up to the coverage limit of $150.0 million , including litigation expenses. We have made a claim for coverage of the litigation trust’s claims against Noble under such entity insurance. The insurers have rejected coverage for these claims. However, we intend to pursue coverage should the litigation be concluded adversely to us or should we settle in litigation. We cannot predict the amount of claims and expenses we may incur, pay or settle in the Paragon Offshore litigation that such insurance will cover, if any. 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 a Master Separation Agreement (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. During the six months ended June 30, 2019 , we recognized charges of $3.8 million recorded in “Net loss from discontinued operations, net of tax” on our Condensed Consolidated Statement of Operations relating to settlement of Mexico customs audits from rigs included in the Spin-off. Tax matters The Internal Revenue Service (“IRS”) has completed its examination procedures including all appeals and administrative reviews for the taxable years ended December 31, 2010 and December 31, 2011. In June 2019, the IRS examination team notified us that they were no longer proposing any adjustments with respect to our tax reporting for the taxable years ended December 31, 2010 and December 31, 2011. We are due a refund for the 2010 and 2011 tax years. During the third quarter of 2017, the IRS initiated its examination of our 2012, 2013, 2014 and 2015 tax returns. We believe that we have accurately reported all amounts in our 2012, 2013, 2014, and 2015 tax returns. Audit claims of approximately $52.6 million attributable to income and other business taxes have been assessed against Noble entities in Mexico related to tax years 2005 and 2007. 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 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, 2019
Supplemental Financial Information [Abstract]
Supplemental Financial Information	Note 14— Supplemental Financial Information Condensed Consolidated Balance Sheets Information Our restricted cash balance as of June 30, 2019 and December 31, 2018 consisted of $1.3 million and $0.7 million , respectively, and is included in “Prepaid expenses and other current assets.” 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, 2019 2018 2019 2018 Accounts receivable $ (21,767 ) $ (7,533 ) $ (21,767 ) $ (7,533 ) Other current assets 3,194 6,534 2,605 5,962 Other assets 5,166 (15,049 ) 6,582 (12,426 ) Accounts payable (3,197 ) 1,014 (3,105 ) 993 Other current liabilities (27,575 ) (10,094 ) (27,422 ) (9,680 ) Other liabilities (5,982 ) (8,396 ) (5,982 ) (8,396 ) Total net change in assets and liabilities $ (50,161 ) $ (33,524 ) $ (49,089 ) $ (31,080 ) Non-cash investing and financing activities Additions to property and equipment, at cost for which we had accrued a corresponding liability in accounts payable as of June 30, 2019 and December 31, 2018 were $46.8 million and $52.1 million , respectively. 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. In February 2019, we entered into the $53.6 million 2019 Seller Loan to finance a portion of the purchase price for the Noble Joe Knight. See “ Note 6— Debt ” for additional information.

Condensed Consolidating Financi

Condensed Consolidating Financial Information	6 Months Ended
	Jun. 30, 2019
Condensed Financial Information Disclosure [Abstract]
Condensed Consolidating Financial Information	Note 15— Condensed Consolidating Financial Information Guarantees of Registered Securities Noble-Cayman, or one or more 100 percent owned subsidiaries of Noble-Cayman, is an issuer, or full and unconditional guarantor or otherwise obligated as of June 30, 2019 with respect to registered securities as follows (see “ Note 6— Debt ” for additional information): Notes (1) Issuer Guarantor 4.90% Senior Notes due 2020 NHIL Noble-Cayman 4.625% Senior Notes due 2021 NHIL Noble-Cayman 3.95% Senior Notes due 2022 NHIL Noble-Cayman 7.75% Senior Notes due 2024 NHIL Noble-Cayman 7.95% Senior Notes due 2025 NHIL Noble-Cayman 6.20% Senior Notes due 2040 NHIL Noble-Cayman 6.05% Senior Notes due 2041 NHIL Noble-Cayman 5.25% Senior Notes due 2042 NHIL Noble-Cayman 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. The following condensed consolidating financial statements of Noble-Cayman, NHIL 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, 2019 (in thousands) (Unaudited) Noble - NHIL Other Consolidating Total ASSETS Current assets Cash and cash equivalents $ — $ — $ 153,703 $ — $ 153,703 Accounts receivable — — 222,889 — 222,889 Taxes receivable — — 25,682 — 25,682 Accounts receivable from affiliates 653,968 61,045 5,262,705 (5,977,718 ) — Prepaid expenses and other current assets 327 — 59,332 — 59,659 Total current assets 654,295 61,045 5,724,311 (5,977,718 ) 461,933 Property and equipment, at cost — — 11,080,690 — 11,080,690 Accumulated depreciation — — (2,621,100 ) — (2,621,100 ) Property and equipment, net — — 8,459,590 — 8,459,590 Notes receivable from affiliates 5,145 — 28,000 (33,145 ) — Investments in affiliates 7,798,404 8,786,983 — (16,585,387 ) — Other assets — — 139,035 — 139,035 Total assets $ 8,457,844 $ 8,848,028 $ 14,350,936 $ (22,596,250 ) $ 9,060,558 LIABILITIES AND EQUITY Current liabilities Current maturities of long-term debt $ 300,000 $ — $ — $ — $ 300,000 Accounts payable 16 — 117,796 — 117,812 Accrued payroll and related costs — — 40,733 — 40,733 Accounts payable to affiliates 4,000,510 1,262,194 715,014 (5,977,718 ) — Taxes payable — 113 25,400 — 25,513 Interest payable 684 85,057 3,412 89,153 Other current liabilities — — 61,361 — 61,361 Total current liabilities 4,301,210 1,347,364 963,716 (5,977,718 ) 634,572 Long-term debt — 3,387,002 166,086 — 3,553,088 Notes payable to affiliates — 28,000 5,145 (33,145 ) — Deferred income taxes — — 70,872 — 70,872 Other liabilities 19,929 — 254,292 — 274,221 Total liabilities 4,321,139 4,762,366 1,460,111 (6,010,863 ) 4,532,753 Commitments and contingencies Shareholders’ equity 4,136,705 4,085,662 12,499,725 (16,585,387 ) 4,136,705 Noncontrolling interests — — 391,100 — 391,100 Total equity 4,136,705 4,085,662 12,890,825 (16,585,387 ) 4,527,805 Total liabilities and equity $ 8,457,844 $ 8,848,028 $ 14,350,936 $ (22,596,250 ) $ 9,060,558 NOBLE CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEET December 31, 2018 (in thousands) (Unaudited) Noble- NHIL Other Consolidating Total ASSETS Current assets Cash and cash equivalents $ — $ 17,818 $ 356,557 $ — $ 374,375 Accounts receivable — — 200,722 — 200,722 Taxes receivable — — 20,498 — 20,498 Short-term notes receivable from affiliates — — 3,175,662 (3,175,662 ) — Accounts receivable from affiliates 275,726 61,046 4,823,902 (5,160,674 ) — Prepaid expenses and other current assets — — 61,917 — 61,917 Total current assets 275,726 78,864 8,639,258 (8,336,336 ) 657,512 Property and equipment, at cost — — 10,956,412 — 10,956,412 Accumulated depreciation — — (2,475,694 ) — (2,475,694 ) Property and equipment, net — — 8,480,718 — 8,480,718 Notes receivable from affiliates 5,145 — — (5,145 ) — Investments in affiliates 7,716,068 12,300,840 — (20,016,908 ) — Other assets 609 — 124,540 — 125,149 Total assets $ 7,997,548 $ 12,379,704 $ 17,244,516 $ (28,358,389 ) $ 9,263,379 LIABILITIES AND EQUITY Current liabilities Short-term notes payables to affiliates $ — $ 3,175,662 $ — $ (3,175,662 ) $ — Accounts payable 45 — 125,192 — 125,237 Accrued payroll and related costs — — 50,284 — 50,284 Accounts payable to affiliates 3,725,506 1,098,395 336,773 (5,160,674 ) — Taxes payable — — 29,386 — 29,386 Interest payable 3 99,997 100 — 100,100 Other current liabilities — — 60,012 — 60,012 Total current liabilities 3,725,554 4,374,054 601,747 (8,336,336 ) 365,019 Long-term debt — 3,817,153 60,249 — 3,877,402 Notes payable to affiliates — — 5,145 (5,145 ) — Deferred income taxes — — 91,695 — 91,695 Other liabilities 19,929 — 255,866 — 275,795 Total liabilities 3,745,483 8,191,207 1,014,702 (8,341,481 ) 4,609,911 Commitments and contingencies Shareholders’ equity 4,252,065 4,188,497 15,828,411 (20,016,908 ) 4,252,065 Noncontrolling interests — — 401,403 — 401,403 Total equity 4,252,065 4,188,497 16,229,814 (20,016,908 ) 4,653,468 Total liabilities and equity $ 7,997,548 $ 12,379,704 $ 17,244,516 $ (28,358,389 ) $ 9,263,379 NOBLE CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS and COMPREHENSIVE INCOME (LOSS) Three Months Ended June 30, 2019 (in thousands) (Unaudited) Noble- NHIL Other Consolidating Total Operating revenues Contract drilling services $ — $ — $ 274,817 $ — $ 274,817 Reimbursables and other — — 18,119 — 18,119 Total operating revenues — — 292,936 — 292,936 Operating costs and expenses Contract drilling services 16 — 168,430 — 168,446 Reimbursables — — 15,381 — 15,381 Depreciation and amortization — — 110,538 — 110,538 General and administrative — 170 8,502 — 8,672 Total operating costs and expenses 16 170 302,851 — 303,037 Operating loss (16 ) (170 ) (9,915 ) — (10,101 ) Other income (expense) Income (loss) of unconsolidated affiliates (40,105 ) (209 ) — 40,314 — Interest expense, net of amounts capitalized (3,301 ) (61,184 ) (5,116 ) 625 (68,976 ) Interest income and other, net 71 (3 ) 2,417 (625 ) 1,860 Income (loss) before income taxes (43,351 ) (61,566 ) (12,614 ) 40,314 (77,217 ) Income tax benefit — — 37,182 — 37,182 Net income (loss) (43,351 ) (61,566 ) 24,568 40,314 (40,035 ) Net (income) loss attributable to noncontrolling interests — — (3,316 ) — (3,316 ) Net income (loss) attributable to Noble Corporation (43,351 ) (61,566 ) 21,252 40,314 (43,351 ) Other comprehensive income (loss), net 143 — 143 (143 ) 143 Comprehensive income (loss) attributable to Noble Corporation $ (43,208 ) $ (61,566 ) $ 21,395 $ 40,171 $ (43,208 ) NOBLE CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS and COMPREHENSIVE INCOME (LOSS) Six Months Ended June 30, 2019 (in thousands) (Unaudited) Noble- NHIL Other Consolidating Total Operating revenues Contract drilling services — — 545,318 — 545,318 Reimbursables and other — — 30,506 — 30,506 Total operating revenues — — 575,824 — 575,824 Operating costs and expenses Contract drilling services 51 — 339,257 — 339,308 Reimbursables — — 24,776 — 24,776 Depreciation and amortization — — 219,310 — 219,310 General and administrative — 173 16,094 — 16,267 Total operating costs and expenses 51 173 599,437 — 599,661 Operating loss (51 ) (173 ) (23,613 ) — (23,837 ) Other income (expense) Income (loss) of unconsolidated affiliates (95,813 ) 1,975 — 93,838 — Income (loss) of unconsolidated affiliates - discontinued operations, net of tax (3,821 ) (3,821 ) — 7,642 — Interest expense, net of amounts capitalized (4,619 ) (132,761 ) (7,344 ) 5,504 (139,220 ) Gain on extinguishment of debt, net — 31,266 — — 31,266 Interest income and other, net 140 (10 ) 9,740 (5,504 ) 4,366 Income (loss) before income taxes (104,164 ) (103,524 ) (21,217 ) 101,480 (127,425 ) Income tax benefit — — 34,317 — 34,317 Net income (loss) from continuing operations (104,164 ) (103,524 ) 13,100 101,480 (93,108 ) Net income (loss) from discontinued operations — — (3,821 ) — (3,821 ) Net income (loss) (104,164 ) (103,524 ) 9,279 101,480 (96,929 ) Net (income) loss attributable to noncontrolling interests — — (7,235 ) — (7,235 ) Net income (loss) attributable to Noble Corporation (104,164 ) (103,524 ) 2,044 101,480 (104,164 ) Other comprehensive income (loss), net 1,201 — 1,201 (1,201 ) 1,201 Comprehensive income (loss) attributable to Noble Corporation $ (102,963 ) $ (103,524 ) $ 3,245 $ 100,279 $ (102,963 ) 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, net of amounts capitalized (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 loss 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, net of amounts capitalized (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 loss 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 CASH FLOWS Six Months Ended June 30, 2019 (in thousands) (Unaudited) Noble- NHIL Other Consolidating Total Cash flows from operating activities Net cash provided by (used in) operating activities $ 4,572 $ (145,632 ) $ 151,915 $ — 10,855 Cash flows from investing activities Capital expenditures — — (152,354 ) — (152,354 ) Proceeds from disposal of assets — — 9,367 — 9,367 Notes receivable from affiliates — — (28,000 ) 28,000 — Net cash provided by (used in) investing activities — — (170,987 ) 28,000 (142,987 ) Cash flows from financing activities Borrowings on credit facilities 300,000 — 70,000 — 370,000 Repayment of long-term debt — (400,000 ) — — (400,000 ) Repayments of credit facilities — — (20,000 ) — (20,000 ) Debt issuance costs — — (90 ) — (90 ) Early repayment of long-term debt — — — — — Premiums paid on early repayment of long-term debt — — — — — Dividends paid to noncontrolling interests — — (17,538 ) — (17,538 ) Distributions to parent company, net (20,284 ) — — — (20,284 ) Advances (to) from affiliates (284,288 ) 499,814 (215,526 ) — — Notes payable to affiliates — 28,000 — (28,000 ) — Net cash provided by (used in) financing activities (4,572 ) 127,814 (183,154 ) (28,000 ) (87,912 ) Net change in cash, cash equivalents and restricted cash — (17,818 ) (202,226 ) — (220,044 ) Cash, cash equivalents and restricted cash, beginning of period — 17,818 357,232 — 375,050 Cash, cash equivalents and restricted cash, end of period $ — $ — $ 155,006 $ — $ 155,006 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 Repayment of long-term debt — (738,555 ) (213,654 ) — (952,209 ) Issuance of senior notes — 750,000 — — 750,000 Debt issuance costs (822 ) (12,581 ) (1,399 ) — (14,802 ) Dividends paid to noncontrolling interests — — (12,694 ) — (12,694 ) Distribution 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, cash equivalents and restricted cash 254 (29,324 ) (222,269 ) — (251,339 ) Cash, cash equivalents and restricted cash, beginning of period 11 29,324 632,676 — 662,011 Cash, cash equivalents and restricted cash, end of period $ 265 $ — $ 410,407 $ — $ 410,672

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2019
Subsequent Events [Abstract]
Subsequent Events	Note 16— Subsequent Events On July 26, 2019, we executed an amendment to our 2017 Credit Facility (the “First Amendment to the 2017 Credit Facility”) that replaced the covenant that limited our ratio of debt to total tangible capitalization with a covenant that limits our ratio of Senior Guaranteed Indebtedness (as defined in the First Amendment to the 2017 Credit Facility) to Adjusted EBITDA (as defined in the First Amendment to the 2017 Credit Facility) as of the last day of each fiscal quarter, with such ratio not to exceed 4.0 to 1.0 for the fiscal quarters ending September 30, 2019 through December 31, 2020, 3.5 to 1.0 for the fiscal quarters ending March 31, 2021 through December 31, 2021 and 3.0 to 1.0 for the fiscal quarters ending March 31, 2022 and thereafter. In addition, the First Amendment to the 2017 Credit Facility reduced total commitments under the 2017 Credit Facility from $1.5 billion to $1.3 billion and added a requirement that any amounts drawn under the 2017 Credit Facility not exceed the amount available under the Indenture Secured Debt Basket (as defined in the First Amendment to the 2017 Credit Facility). The maturity remains January 2023.

Organization and Basis of Pre_2

Organization and Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2019
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, 2018 Condensed Consolidated Balance Sheets presented herein are derived from the December 31, 2018 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, 2018 , 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.
Accounting Pronouncements	Accounting Standards Adopted In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2016-02 (Topic 842, “Leases”), as amended, which generally requires lessees to recognize operating and financing lease liabilities and corresponding right-of-use assets on the balance sheet and to provide enhanced disclosures surrounding the amount, time and uncertainty of cash flows arising from lease agreements. We adopted this standard, on a modified retrospective basis, effective January 1, 2019 and did not restate comparative periods. Our adoption did not have a material effect on our condensed consolidated financial statements. With respect to leases in which we are the lessee, we recognized a lease liability and a corresponding right-of-use asset of approximately $28.0 million as of January 1, 2019. We have elected the package of practical expedients that permits us to not reassess (1) whether previously expired or existing contracts are or contain leases, (2) the lease classification for any expired or existing leases, and (3) any initial direct costs for any existing leases as of the effective date. In addition, we have elected the hindsight practical expedient in connection with our adoption of the new lease standard. As lessee, we have made the accounting policy election to not recognize a right-of-use asset lease and lease liability for leases with a term of 12 months or less. We will recognize lease payments in the Consolidated Statements of Operations on a straight-line basis over the lease term. We have also elected the practical expedient to not separate lease and non-lease components. Our drilling contracts contain a lease component related to the underlying drilling equipment, in addition to the service component provided by our crews and our expertise to operate such drilling equipment. We have concluded the non-lease service of operating our equipment and providing expertise in the drilling of the client’s well is predominant in our drilling contracts. We have applied the practical expedient to account for the lease and associated non-lease components as a single component. With the election of the practical expedient, we will continue to present a single performance obligation under the new revenue guidance in Accounting Standards Codification (“ASC”) Topic 606, “Revenue from Contracts with Customers.” Issued Accounting Standards 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.
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, 2019
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 loss per share for Noble-UK: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Numerator: Basic Net loss from continuing operations $ (151,960 ) $ (628,063 ) $ (219,028 ) $ (770,397 ) Net loss from discontinued operations, net of tax — — (3,821 ) — Net loss attributable to Noble Corporation plc $ (151,960 ) $ (628,063 ) $ (222,849 ) $ (770,397 ) Diluted Net loss from continuing operations $ (151,960 ) $ (628,063 ) $ (219,028 ) $ (770,397 ) Net loss from discontinued operations, net of tax — — (3,821 ) — Net loss attributable to Noble Corporation plc $ (151,960 ) $ (628,063 ) $ (222,849 ) $ (770,397 ) Denominator: Weighted average shares outstanding - basic 249,154 246,740 248,705 246,438 Weighted average shares outstanding - diluted 249,154 246,740 248,705 246,438 Loss per share Basic: Loss from continuing operations $ (0.61 ) $ (2.55 ) $ (0.88 ) $ (3.13 ) Loss from discontinued operations — — (0.02 ) — Net loss attributable to Noble Corporation plc $ (0.61 ) $ (2.55 ) $ (0.90 ) $ (3.13 ) Diluted: Loss from continuing operations $ (0.61 ) $ (2.55 ) $ (0.88 ) $ (3.13 ) Loss from discontinued operations — — (0.02 ) — Net loss attributable to Noble Corporation plc $ (0.61 ) $ (2.55 ) $ (0.90 ) $ (3.13 )

Property and Equipment (Tables)

Property and Equipment (Tables)	6 Months Ended
	Jun. 30, 2019
Property, Plant and Equipment [Abstract]
Property and Equipment, at Cost	Property and equipment, at cost, for Noble-UK consisted of the following: June 30, 2019 December 31, 2018 Drilling equipment and facilities $ 10,685,462 $ 10,546,376 Construction in progress 192,966 209,091 Other 202,262 200,945 Property and equipment, at cost $ 11,080,690 $ 10,956,412

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2019
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, 2019 December 31, 2018 Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Senior unsecured notes: 4.90% Senior Notes due August 2020 $ 62,480 $ 59,107 $ 65,810 $ 60,177 4.625% Senior Notes due March 2021 79,821 76,114 92,967 84,931 3.95% Senior Notes due March 2022 21,175 18,564 41,617 37,096 7.75% Senior Notes due January 2024 389,067 305,300 783,350 613,719 7.95% Senior Notes due April 2025 446,735 325,103 446,517 339,035 7.875% Senior Notes due February 2026 738,710 643,710 738,075 647,085 6.20% Senior Notes due August 2040 390,489 214,754 390,454 245,242 6.05% Senior Notes due March 2041 389,750 214,216 389,693 247,171 5.25% Senior Notes due March 2042 478,058 256,246 477,996 277,056 8.95% Senior Notes due April 2045 390,716 262,236 390,672 311,392 Seller loans: Seller-financed secured loan due September 2022 61,732 56,619 60,251 57,902 Seller-financed secured loan due February 2023 54,355 46,779 — — Credit facilities: 2015 Credit Facility matures January 2020 300,000 300,000 — — 2017 Credit Facility matures January 2023 50,000 50,000 — — Total debt 3,853,088 2,828,748 3,877,402 2,920,806 Less: Current maturities of long-term debt (300,000 ) (300,000 ) — — Long-term debt $ 3,553,088 $ 2,528,748 $ 3,877,402 $ 2,920,806

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	6 Months Ended
	Jun. 30, 2019
Equity [Abstract]
Changes in Accumulated Balances for Components of AOCI	The following table presents the changes in the accumulated balances for each component of “Accumulated other comprehensive income (loss)” (“AOCI”) for the three and six months ended June 30, 2019 and 2018 . All amounts within the table are shown net of tax. Defined Benefit Pension Items (1) Foreign Currency Items Total Balance at December 31, 2017 $ (27,603 ) $ (15,285 ) $ (42,888 ) Activity during period: Stranded tax effect resulting from the Tax Cuts and Jobs Act (5,540 ) — (5,540 ) Balance at January 1, 2018 (33,143 ) (15,285 ) (48,428 ) Activity during period: Other comprehensive income (loss) before reclassifications — 667 667 Amounts reclassified from AOCI 324 — 324 Net other comprehensive income 324 667 991 Balance at March 31, 2018 (32,819 ) (14,618 ) (47,437 ) Activity during period: Other comprehensive income (loss) before reclassifications — (2,771 ) (2,771 ) Amounts reclassified from AOCI 325 — 325 Net other comprehensive income 325 (2,771 ) (2,446 ) Balance at June 30, 2018 $ (32,494 ) $ (17,389 ) $ (49,883 ) Balance at December 31, 2018 $ (39,058 ) $ (18,014 ) $ (57,072 ) Activity during period: Other comprehensive income (loss) before reclassifications — 508 508 Amounts reclassified from AOCI 550 — 550 Net other comprehensive income (loss) 550 508 1,058 Balance at March 31, 2019 (38,508 ) (17,506 ) (56,014 ) Activity during period: Other comprehensive income (loss) before reclassifications — (406 ) (406 ) Amounts reclassified from AOCI 549 — 549 Net other comprehensive income (loss) 549 (406 ) 143 Balance at June 30, 2019 $ (37,959 ) $ (17,912 ) $ (55,871 ) (1) Defined benefit pension items relate to actuarial changes. Reclassifications from AOCI are recognized as expense on our Condensed Consolidated Statements of Operations through “Other income (expense).” See “ Note 11— Employee Benefit Plans ” for additional information.

Revenue and Customers (Tables)

Revenue and Customers (Tables)	6 Months Ended
	Jun. 30, 2019
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, 2019 December 31, 2018 Current contract assets $ 21,635 $ 25,298 Noncurrent contract assets 18,484 22,366 Total contract assets 40,119 47,664 Current contract liabilities (deferred revenue) (31,063 ) (32,906 ) Noncurrent contract liabilities (deferred revenue) (46,740 ) (47,847 ) Total contract liabilities $ (77,803 ) $ (80,753 ) Significant changes in the remaining performance obligation contract assets and the contract liabilities balances for the six months ended June 30, 2019 are as follows: Contract Assets Contract Liabilities Net balance at December 31, 2018 $ 47,664 $ (80,753 ) Amortization of deferred costs (16,811 ) — Additions to deferred costs 9,266 — Amortization of deferred revenue — 28,907 Additions to deferred revenue — (25,957 ) Total (7,545 ) 2,950 Net balance at June 30, 2019 $ 40,119 $ (77,803 )
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 June 30, 2019 2019 2020 2021 2022 2023 and beyond Total Floaters $ 8,848 $ 16,466 $ 15,742 $ 9,248 $ 3,566 $ 53,870 Jackups 8,270 9,260 5,605 798 — 23,933 Total $ 17,118 $ 25,726 $ 21,347 $ 10,046 $ 3,566 $ 77,803
Disaggregation of revenue by rig types	The following table provides information about contract drilling revenue by rig types: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Floaters $ 144,079 $ 134,079 $ 297,233 $ 254,715 Jackups 130,738 113,610 248,085 222,080 Total $ 274,817 $ 247,689 $ 545,318 $ 476,795

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Supplemental financial information and lease cost	Supplemental balance sheet information related to leases was as follows: June 30, 2019 Operating Leases Operating lease right-of-use assets $ 28,895 Current operating lease liabilities 4,674 Long-term operating lease liabilities 23,759 Weighted average remaining lease term for operating leases (years) 8.8 Weighted average discounted rate for operating leases 9.6 % The components of lease cost were as follows: Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 Operating lease cost $ 1,714 $ 3,573 Short-term lease cost 2,357 4,409 Variable lease cost 216 745 Total lease cost $ 4,287 $ 8,727 Supplemental cash flow information related to leases was as follows: Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 1,641 $ 3,841
Maturities of lease liabilities	Maturities of lease liabilities as of June 30, 2019 were as follows: Operating Leases 2019 (remainder) $ 3,403 2020 6,634 2021 4,930 2022 3,867 2023 3,473 Thereafter 22,421 Total lease payments 44,728 Less: Interest (16,295 ) Present value of lease liability $ 28,433

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	6 Months Ended
	Jun. 30, 2019
Retirement Benefits [Abstract]
Pension Costs	Pension costs include the following components for the three and six months ended June 30, 2019 and 2018 : Three Months Ended June 30, 2019 2018 Non-U.S. U.S. Non-U.S. U.S. Interest cost $ 431 $ 2,178 $ 354 $ 2,044 Return on plan assets (614 ) (2,579 ) (710 ) (2,978 ) Recognized net actuarial loss 2 693 — 411 Net pension benefit cost (gain) $ (181 ) $ 292 $ (356 ) $ (523 ) Six Months Ended June 30, 2019 2018 Non-U.S. U.S. Non-U.S. U.S. Interest cost $ 876 $ 4,356 $ 819 $ 4,089 Return on plan assets (1,248 ) (5,157 ) (1,426 ) (5,957 ) Recognized net actuarial loss 5 1,385 — 822 Net pension benefit cost (gain) $ (367 ) $ 584 $ (607 ) $ (1,046 )

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2019
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, 2019 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 $ 7,675 $ 7,675 $ — $ — December 31, 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 $ 8,659 $ 8,659 $ — $ —

Supplemental Financial Inform_2

Supplemental Financial Information (Tables)	6 Months Ended
	Jun. 30, 2019
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, 2019 2018 2019 2018 Accounts receivable $ (21,767 ) $ (7,533 ) $ (21,767 ) $ (7,533 ) Other current assets 3,194 6,534 2,605 5,962 Other assets 5,166 (15,049 ) 6,582 (12,426 ) Accounts payable (3,197 ) 1,014 (3,105 ) 993 Other current liabilities (27,575 ) (10,094 ) (27,422 ) (9,680 ) Other liabilities (5,982 ) (8,396 ) (5,982 ) (8,396 ) Total net change in assets and liabilities $ (50,161 ) $ (33,524 ) $ (49,089 ) $ (31,080 )

Condensed Consolidating Finan_2

Condensed Consolidating Financial Information (Tables)	6 Months Ended
	Jun. 30, 2019
Condensed Financial Information Disclosure [Abstract]
Guarantor Obligations	Noble-Cayman, or one or more 100 percent owned subsidiaries of Noble-Cayman, is an issuer, or full and unconditional guarantor or otherwise obligated as of June 30, 2019 with respect to registered securities as follows (see “ Note 6— Debt ” for additional information): Notes (1) Issuer Guarantor 4.90% Senior Notes due 2020 NHIL Noble-Cayman 4.625% Senior Notes due 2021 NHIL Noble-Cayman 3.95% Senior Notes due 2022 NHIL Noble-Cayman 7.75% Senior Notes due 2024 NHIL Noble-Cayman 7.95% Senior Notes due 2025 NHIL Noble-Cayman 6.20% Senior Notes due 2040 NHIL Noble-Cayman 6.05% Senior Notes due 2041 NHIL Noble-Cayman 5.25% Senior Notes due 2042 NHIL Noble-Cayman 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.
Condensed Consolidating Balance Sheet	NOBLE CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEET June 30, 2019 (in thousands) (Unaudited) Noble - NHIL Other Consolidating Total ASSETS Current assets Cash and cash equivalents $ — $ — $ 153,703 $ — $ 153,703 Accounts receivable — — 222,889 — 222,889 Taxes receivable — — 25,682 — 25,682 Accounts receivable from affiliates 653,968 61,045 5,262,705 (5,977,718 ) — Prepaid expenses and other current assets 327 — 59,332 — 59,659 Total current assets 654,295 61,045 5,724,311 (5,977,718 ) 461,933 Property and equipment, at cost — — 11,080,690 — 11,080,690 Accumulated depreciation — — (2,621,100 ) — (2,621,100 ) Property and equipment, net — — 8,459,590 — 8,459,590 Notes receivable from affiliates 5,145 — 28,000 (33,145 ) — Investments in affiliates 7,798,404 8,786,983 — (16,585,387 ) — Other assets — — 139,035 — 139,035 Total assets $ 8,457,844 $ 8,848,028 $ 14,350,936 $ (22,596,250 ) $ 9,060,558 LIABILITIES AND EQUITY Current liabilities Current maturities of long-term debt $ 300,000 $ — $ — $ — $ 300,000 Accounts payable 16 — 117,796 — 117,812 Accrued payroll and related costs — — 40,733 — 40,733 Accounts payable to affiliates 4,000,510 1,262,194 715,014 (5,977,718 ) — Taxes payable — 113 25,400 — 25,513 Interest payable 684 85,057 3,412 89,153 Other current liabilities — — 61,361 — 61,361 Total current liabilities 4,301,210 1,347,364 963,716 (5,977,718 ) 634,572 Long-term debt — 3,387,002 166,086 — 3,553,088 Notes payable to affiliates — 28,000 5,145 (33,145 ) — Deferred income taxes — — 70,872 — 70,872 Other liabilities 19,929 — 254,292 — 274,221 Total liabilities 4,321,139 4,762,366 1,460,111 (6,010,863 ) 4,532,753 Commitments and contingencies Shareholders’ equity 4,136,705 4,085,662 12,499,725 (16,585,387 ) 4,136,705 Noncontrolling interests — — 391,100 — 391,100 Total equity 4,136,705 4,085,662 12,890,825 (16,585,387 ) 4,527,805 Total liabilities and equity $ 8,457,844 $ 8,848,028 $ 14,350,936 $ (22,596,250 ) $ 9,060,558 NOBLE CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEET December 31, 2018 (in thousands) (Unaudited) Noble- NHIL Other Consolidating Total ASSETS Current assets Cash and cash equivalents $ — $ 17,818 $ 356,557 $ — $ 374,375 Accounts receivable — — 200,722 — 200,722 Taxes receivable — — 20,498 — 20,498 Short-term notes receivable from affiliates — — 3,175,662 (3,175,662 ) — Accounts receivable from affiliates 275,726 61,046 4,823,902 (5,160,674 ) — Prepaid expenses and other current assets — — 61,917 — 61,917 Total current assets 275,726 78,864 8,639,258 (8,336,336 ) 657,512 Property and equipment, at cost — — 10,956,412 — 10,956,412 Accumulated depreciation — — (2,475,694 ) — (2,475,694 ) Property and equipment, net — — 8,480,718 — 8,480,718 Notes receivable from affiliates 5,145 — — (5,145 ) — Investments in affiliates 7,716,068 12,300,840 — (20,016,908 ) — Other assets 609 — 124,540 — 125,149 Total assets $ 7,997,548 $ 12,379,704 $ 17,244,516 $ (28,358,389 ) $ 9,263,379 LIABILITIES AND EQUITY Current liabilities Short-term notes payables to affiliates $ — $ 3,175,662 $ — $ (3,175,662 ) $ — Accounts payable 45 — 125,192 — 125,237 Accrued payroll and related costs — — 50,284 — 50,284 Accounts payable to affiliates 3,725,506 1,098,395 336,773 (5,160,674 ) — Taxes payable — — 29,386 — 29,386 Interest payable 3 99,997 100 — 100,100 Other current liabilities — — 60,012 — 60,012 Total current liabilities 3,725,554 4,374,054 601,747 (8,336,336 ) 365,019 Long-term debt — 3,817,153 60,249 — 3,877,402 Notes payable to affiliates — — 5,145 (5,145 ) — Deferred income taxes — — 91,695 — 91,695 Other liabilities 19,929 — 255,866 — 275,795 Total liabilities 3,745,483 8,191,207 1,014,702 (8,341,481 ) 4,609,911 Commitments and contingencies Shareholders’ equity 4,252,065 4,188,497 15,828,411 (20,016,908 ) 4,252,065 Noncontrolling interests — — 401,403 — 401,403 Total equity 4,252,065 4,188,497 16,229,814 (20,016,908 ) 4,653,468 Total liabilities and equity $ 7,997,548 $ 12,379,704 $ 17,244,516 $ (28,358,389 ) $ 9,263,379
Condensed Consolidating Statement of Income	NOBLE CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS and COMPREHENSIVE INCOME (LOSS) Three Months Ended June 30, 2019 (in thousands) (Unaudited) Noble- NHIL Other Consolidating Total Operating revenues Contract drilling services $ — $ — $ 274,817 $ — $ 274,817 Reimbursables and other — — 18,119 — 18,119 Total operating revenues — — 292,936 — 292,936 Operating costs and expenses Contract drilling services 16 — 168,430 — 168,446 Reimbursables — — 15,381 — 15,381 Depreciation and amortization — — 110,538 — 110,538 General and administrative — 170 8,502 — 8,672 Total operating costs and expenses 16 170 302,851 — 303,037 Operating loss (16 ) (170 ) (9,915 ) — (10,101 ) Other income (expense) Income (loss) of unconsolidated affiliates (40,105 ) (209 ) — 40,314 — Interest expense, net of amounts capitalized (3,301 ) (61,184 ) (5,116 ) 625 (68,976 ) Interest income and other, net 71 (3 ) 2,417 (625 ) 1,860 Income (loss) before income taxes (43,351 ) (61,566 ) (12,614 ) 40,314 (77,217 ) Income tax benefit — — 37,182 — 37,182 Net income (loss) (43,351 ) (61,566 ) 24,568 40,314 (40,035 ) Net (income) loss attributable to noncontrolling interests — — (3,316 ) — (3,316 ) Net income (loss) attributable to Noble Corporation (43,351 ) (61,566 ) 21,252 40,314 (43,351 ) Other comprehensive income (loss), net 143 — 143 (143 ) 143 Comprehensive income (loss) attributable to Noble Corporation $ (43,208 ) $ (61,566 ) $ 21,395 $ 40,171 $ (43,208 ) NOBLE CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS and COMPREHENSIVE INCOME (LOSS) Six Months Ended June 30, 2019 (in thousands) (Unaudited) Noble- NHIL Other Consolidating Total Operating revenues Contract drilling services — — 545,318 — 545,318 Reimbursables and other — — 30,506 — 30,506 Total operating revenues — — 575,824 — 575,824 Operating costs and expenses Contract drilling services 51 — 339,257 — 339,308 Reimbursables — — 24,776 — 24,776 Depreciation and amortization — — 219,310 — 219,310 General and administrative — 173 16,094 — 16,267 Total operating costs and expenses 51 173 599,437 — 599,661 Operating loss (51 ) (173 ) (23,613 ) — (23,837 ) Other income (expense) Income (loss) of unconsolidated affiliates (95,813 ) 1,975 — 93,838 — Income (loss) of unconsolidated affiliates - discontinued operations, net of tax (3,821 ) (3,821 ) — 7,642 — Interest expense, net of amounts capitalized (4,619 ) (132,761 ) (7,344 ) 5,504 (139,220 ) Gain on extinguishment of debt, net — 31,266 — — 31,266 Interest income and other, net 140 (10 ) 9,740 (5,504 ) 4,366 Income (loss) before income taxes (104,164 ) (103,524 ) (21,217 ) 101,480 (127,425 ) Income tax benefit — — 34,317 — 34,317 Net income (loss) from continuing operations (104,164 ) (103,524 ) 13,100 101,480 (93,108 ) Net income (loss) from discontinued operations — — (3,821 ) — (3,821 ) Net income (loss) (104,164 ) (103,524 ) 9,279 101,480 (96,929 ) Net (income) loss attributable to noncontrolling interests — — (7,235 ) — (7,235 ) Net income (loss) attributable to Noble Corporation (104,164 ) (103,524 ) 2,044 101,480 (104,164 ) Other comprehensive income (loss), net 1,201 — 1,201 (1,201 ) 1,201 Comprehensive income (loss) attributable to Noble Corporation $ (102,963 ) $ (103,524 ) $ 3,245 $ 100,279 $ (102,963 ) 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, net of amounts capitalized (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 loss 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, net of amounts capitalized (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 loss 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 )
Condensed Consolidating Statement of Cash Flows	NOBLE CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS Six Months Ended June 30, 2019 (in thousands) (Unaudited) Noble- NHIL Other Consolidating Total Cash flows from operating activities Net cash provided by (used in) operating activities $ 4,572 $ (145,632 ) $ 151,915 $ — 10,855 Cash flows from investing activities Capital expenditures — — (152,354 ) — (152,354 ) Proceeds from disposal of assets — — 9,367 — 9,367 Notes receivable from affiliates — — (28,000 ) 28,000 — Net cash provided by (used in) investing activities — — (170,987 ) 28,000 (142,987 ) Cash flows from financing activities Borrowings on credit facilities 300,000 — 70,000 — 370,000 Repayment of long-term debt — (400,000 ) — — (400,000 ) Repayments of credit facilities — — (20,000 ) — (20,000 ) Debt issuance costs — — (90 ) — (90 ) Early repayment of long-term debt — — — — — Premiums paid on early repayment of long-term debt — — — — — Dividends paid to noncontrolling interests — — (17,538 ) — (17,538 ) Distributions to parent company, net (20,284 ) — — — (20,284 ) Advances (to) from affiliates (284,288 ) 499,814 (215,526 ) — — Notes payable to affiliates — 28,000 — (28,000 ) — Net cash provided by (used in) financing activities (4,572 ) 127,814 (183,154 ) (28,000 ) (87,912 ) Net change in cash, cash equivalents and restricted cash — (17,818 ) (202,226 ) — (220,044 ) Cash, cash equivalents and restricted cash, beginning of period — 17,818 357,232 — 375,050 Cash, cash equivalents and restricted cash, end of period $ — $ — $ 155,006 $ — $ 155,006 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 Repayment of long-term debt — (738,555 ) (213,654 ) — (952,209 ) Issuance of senior notes — 750,000 — — 750,000 Debt issuance costs (822 ) (12,581 ) (1,399 ) — (14,802 ) Dividends paid to noncontrolling interests — — (12,694 ) — (12,694 ) Distribution 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, cash equivalents and restricted cash 254 (29,324 ) (222,269 ) — (251,339 ) Cash, cash equivalents and restricted cash, beginning of period 11 29,324 632,676 — 662,011 Cash, cash equivalents and restricted cash, end of period $ 265 $ — $ 410,407 $ — $ 410,672

Organization and Basis of Pre_3

Organization and Basis of Presentation (Details)	6 Months Ended
	Jun. 30, 2019VesselSegment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of floaters (vessel)	12
Number of semisubmersibles (vessel)	4
Number of drillships (vessel)	8
Number of jackups (vessel)	13
Number of reportable segments | Segment	1

Accounting Pronouncements (Deta

Accounting Pronouncements (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 28,895
Present value of lease liability	$ 28,433
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets		$ 28,000
Present value of lease liability		$ 28,000

Consolidated Joint Ventures (De

Consolidated Joint Ventures (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)JointVentureVessel	Jun. 30, 2018USD ($)	Dec. 31, 2018USD ($)
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
Cash and cash equivalents	$ 153,766		$ 153,766		$ 375,232
Bully Joint Venture
Schedule Of Equity Method Investments [Line Items]
Dividends approved	25,000	$ 20,100	35,100	$ 25,400
Carrying amount of the drillships	700,000		700,000		708,500
Cash and cash equivalents	$ 28,800		$ 28,800		$ 45,200
Bully Joint Venture
Schedule Of Equity Method Investments [Line Items]
Percentage attributable to noncontrolling interests	50.00%		50.00%

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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Basic
Net loss from continuing operations	$ (151,960)	$ (628,063)	$ (219,028)	$ (770,397)
Net loss from discontinued operations, net of tax	0	0	(3,821)	0
Net loss attributable to Noble Corporation plc	(151,960)	(628,063)	(222,849)	(770,397)
Diluted
Net loss attributable to Noble Corporation plc	$ (151,960)	$ (628,063)	$ (222,849)	$ (770,397)
Denominator:
Weighted average shares outstanding - basic (shares)	249,154	246,740	248,705	246,438
Weighted average shares outstanding - diluted (shares)	249,154	246,740	248,705	246,438
Basic:
Income (loss) from continuing operations (usd per share)	$ (0.61)	$ (2.55)	$ (0.88)	$ (3.13)
Loss from discontinued operations (usd per share)	0	0	(0.02)	0
Net income (loss) attributable to the company (usd per share)	(0.61)	(2.55)	(0.90)	(3.13)
Diluted:
Income (loss) from continuing operations (usd per share)	(0.61)	(2.55)	(0.88)	(3.13)
Loss from discontinued operations (usd per share)	0	0	(0.02)	0
Net income (loss) (usd per share)	$ (0.61)	$ (2.55)	$ (0.90)	$ (3.13)

Loss Per Share - Additional Inf

Loss Per Share - Additional Information (Details) - $ / shares	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares outstanding and trading (shares)	249,155,000	249,155,000		246,794,000
Additional shares authorized for issuance (shares)		83,100,000
Current nominal value per share (usd per share)	$ 0.01	$ 0.01		$ 0.01
Number of shares allotted (shares)		0
Number of shares repurchased (shares)		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	13,400,000	13,400,000

Property and Equipment (Details

Property and Equipment (Details) - USD ($) $ in Thousands	Feb. 28, 2019	Feb. 28, 2019	Jun. 30, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, at cost			$ 11,080,690	$ 10,956,412
Drilling equipment and facilities
Property, Plant and Equipment [Line Items]
Property and equipment, at cost			10,685,462	10,546,376
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, at cost			192,966	209,091
Other
Property, Plant and Equipment [Line Items]
Property and equipment, at cost			$ 202,262	$ 200,945
Noble Joe Knight
Property, Plant and Equipment [Line Items]
Purchase price of asset acquired	$ 83,800	$ 83,800
Seller-financed secured loan due February 2023
Property, Plant and Equipment [Line Items]
Financed value	53,600	$ 53,600
Seller-financed secured loan due February 2023 | Other:
Property, Plant and Equipment [Line Items]
Cash paid to acquire asset	$ 30,200

Debt - Additional Information (

Debt - Additional Information (Details)

Feb. 28, 2019USD ($)

Jan. 31, 2018USD ($)

Mar. 31, 2019USD ($)

Feb. 28, 2019USD ($)

Oct. 31, 2018USD ($)

Sep. 30, 2018USD ($)

Aug. 31, 2018USD ($)

Mar. 31, 2018USD ($)

Feb. 28, 2018USD ($)

Jun. 30, 2019USD ($)

Jun. 30, 2018USD ($)

Jun. 30, 2019USD ($)

Jun. 30, 2018USD ($)

Feb. 01, 2018USD ($)

Jan. 03, 2018USD ($)

Dec. 21, 2017USD ($)

Debt Instrument [Line Items]

Term of debt instrument

4 years

4 years

Gain (loss) on extinguishment of debt, net

$ 0

$ 0

$ 31,266,000

$ (8,768,000)

Seller-financed secured loan due February 2023

Debt Instrument [Line Items]

Financed value

$ 53,600,000

$ 53,600,000

Seller-financed secured loan due September 2022

Debt Instrument [Line Items]

Financed value

$ 60,000,000

Line of credit | 2015 Credit Facility matures January 2020

Debt Instrument [Line Items]

Net loss due to reduction of aggregate principal amount

2,300,000

Line of credit | 2017 Credit Facility matures January 2023

Debt Instrument [Line Items]

Maximum borrowing capacity under credit facilities

$ 1,500,000,000

$ 1,500,000,000

$ 1,500,000,000

Senior unsecured notes

Debt Instrument [Line Items]

Purchase of senior notes

$ 440,900,000

$ 27,400,000

$ 400,000

$ 9,500,000

$ 754,200,000

Repurchase amount

400,000,000

20,200,000

300,000

8,700,000

$ 750,000,000

Gain (loss) on extinguishment of debt, net

$ 31,300,000

$ 6,900,000

$ 100,000

500,000

$ (3,500,000)

Extinguished aggregate principal amount

$ 126,600,000

Senior unsecured notes | 2015 Credit Facility matures January 2020

Debt Instrument [Line Items]

Maximum debt to tangible capitalization covenant

60.00%

60.00%

Senior unsecured notes | 2026 Notes

Debt Instrument [Line Items]

Debt instrument, aggregate principal 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 | 7.50% Senior Notes due March 2019

Debt Instrument [Line Items]

Purchase of senior notes

61,900,000

Repurchase amount

65,300,000

Gain (loss) on extinguishment of debt, net

$ (3,500,000)

Secured loan | Seller-financed secured loan due February 2023

Debt Instrument [Line Items]

Interest rate

4.25%

4.25%

Interest rate paid-in-kind

1.25%

1.25%

Interest rate on first year

8.91%

8.91%

Secured loan | Seller-financed secured loan due September 2022

Debt Instrument [Line Items]

Term of debt instrument

4 years

Interest rate

4.25%

Interest rate paid-in-kind

1.25%

Interest rate on first year

8.91%

Senior unsecured credit facility

Debt Instrument [Line Items]

Maximum borrowing capacity under credit facilities

$ 300,000,000

$ 300,000,000

Credit Facility | Line of credit | 2015 Credit Facility matures January 2020

Debt Instrument [Line Items]

Maximum borrowing capacity under credit facilities

300,000,000

300,000,000

Credit Facility | Line of credit | 2017 Credit Facility matures January 2023

Debt Instrument [Line Items]

Maximum borrowing capacity under credit facilities

$ 300,000,000

$ 300,000,000

Credit facility, ability to increase (up to)

500,000,000

Maximum debt to tangible capitalization covenant

48.00%

48.00%

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

0.80

Covenant, restrictions on borrowings, maximum Available Cash

$ 200,000,000

Letters of credit | Line of credit | 2017 Credit Facility matures January 2023

Debt Instrument [Line Items]

Maximum borrowing capacity under credit facilities

$ 50,000,000

$ 50,000,000

$ 15,000,000

Borrowings outstanding or letters of credit issued

$ 3,400,000

$ 3,400,000

Noble Joe Knight

Debt Instrument [Line Items]

Purchase price of asset acquired

$ 83,800,000

$ 83,800,000

Noble Johnny Whitstine

Debt Instrument [Line Items]

Purchase price of asset acquired

$ 93,800,000

Due at End of Third-Year | Seller-financed secured loan due February 2023

Debt Instrument [Line Items]

Term of debt instrument

4 years

Percentage of principal payment due at end of term

5.00%

5.00%

Due at End of Third-Year | Seller-financed secured loan due September 2022

Debt Instrument [Line Items]

Percentage of principal payment due at end of term

5.00%

Due at End of Four-Year Term | Seller-financed secured loan due February 2023

Debt Instrument [Line Items]

Percentage of principal payment due at end of term

95.00%

95.00%

Due at End of Four-Year Term | Seller-financed secured loan due September 2022

Debt Instrument [Line Items]

Percentage of principal payment due at end of term

95.00%

Maximum | Credit Facility | Line of credit | 2017 Credit Facility matures January 2023

Debt Instrument [Line Items]

Maximum debt to tangible capitalization covenant

55.00%

55.00%

LIBOR | Maximum | Credit Facility | Line of credit | 2015 Credit Facility matures January 2020

Debt Instrument [Line Items]

Interest rate on senior notes

1.65%

LIBOR | Maximum | Credit Facility | Line of credit | 2017 Credit Facility matures January 2023

Debt Instrument [Line Items]

Interest rate on senior notes

4.25%

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, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Less: Current maturities of long-term debt	$ (300,000)	$ 0
Long-term debt	3,553,088	3,877,402
Carrying Value
Debt Instrument [Line Items]
Senior unsecured notes	3,853,088	3,877,402
Less: Current maturities of long-term debt	(300,000)	0
Long-term debt	3,553,088	3,877,402
Estimated Fair Value
Debt Instrument [Line Items]
Senior unsecured notes	2,828,748	2,920,806
Less: Current maturities of long-term debt	(300,000)	0
Long-term debt	$ 2,528,748	2,920,806
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 | 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	$ 62,480	65,810
Senior unsecured notes | 4.90% Senior Notes due August 2020 | Estimated Fair Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 59,107	60,177
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	$ 79,821	92,967
Senior unsecured notes | 4.625% Senior Notes due March 2021 | Estimated Fair Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 76,114	84,931
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	$ 21,175	41,617
Senior unsecured notes | 3.95% Senior Notes due March 2022 | Estimated Fair Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 18,564	37,096
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	$ 389,067	783,350
Senior unsecured notes | 7.75% Senior Notes due January 2024 | Estimated Fair Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 305,300	613,719
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	$ 446,735	446,517
Senior unsecured notes | 7.95% Senior Notes due April 2025 | Estimated Fair Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 325,103	339,035
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	$ 738,710	738,075
Senior unsecured notes | 7.875% Senior Notes due February 2026 | Estimated Fair Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 643,710	647,085
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	$ 390,489	390,454
Senior unsecured notes | 6.20% Senior Notes due August 2040 | Estimated Fair Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 214,754	245,242
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	$ 389,750	389,693
Senior unsecured notes | 6.05% Senior Notes due March 2041 | Estimated Fair Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 214,216	247,171
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	$ 478,058	477,996
Senior unsecured notes | 5.25% Senior Notes due March 2042 | Estimated Fair Value
Debt Instrument [Line Items]
Senior unsecured notes	$ 256,246	277,056
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	$ 390,716	390,672
Senior unsecured notes | 8.95% Senior Notes due April 2045 | Estimated Fair Value
Debt Instrument [Line Items]
Senior unsecured notes	262,236	311,392
Seller loans: | Seller-financed secured loan due September 2022 | Carrying Value
Debt Instrument [Line Items]
Senior unsecured notes	61,732	60,251
Seller loans: | Seller-financed secured loan due September 2022 | Estimated Fair Value
Debt Instrument [Line Items]
Senior unsecured notes	56,619	57,902
Seller loans: | Seller-financed secured loan due February 2023 | Carrying Value
Debt Instrument [Line Items]
Senior unsecured notes	54,355	0
Seller loans: | Seller-financed secured loan due February 2023 | Estimated Fair Value
Debt Instrument [Line Items]
Senior unsecured notes	46,779	0
Credit Facility | Line of credit | 2015 Credit Facility matures January 2020 | Carrying Value
Debt Instrument [Line Items]
Credit facilities	300,000	0
Credit Facility | Line of credit | 2015 Credit Facility matures January 2020 | Estimated Fair Value
Debt Instrument [Line Items]
Credit facilities	300,000	0
Credit Facility | Line of credit | 2017 Credit Facility matures January 2023 | Carrying Value
Debt Instrument [Line Items]
Credit facilities	50,000	0
Credit Facility | Line of credit | 2017 Credit Facility matures January 2023 | Estimated Fair Value
Debt Instrument [Line Items]
Credit facilities	$ 50,000	$ 0

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	Jan. 01, 2018	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	$ 5,950,628	$ 4,583,808	$ 4,654,574	$ 5,658,842	$ 5,950,628	$ 4,654,574	$ 5,950,628
Stranded tax effect resulting from the Tax Cuts and Jobs Act	(5,540)
Other comprehensive income (loss) before reclassifications		(406)	508	(2,771)	667
Amounts reclassified from AOCI		549	550	325	324
Other comprehensive income (loss), net		143	1,058	(2,446)	991	1,201	(1,455)
Ending Balance		4,427,749	4,583,808	4,774,595	5,658,842	4,427,749	4,774,595
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(27,603)	(38,508)	(39,058)	(32,819)	(27,603)	(39,058)	(27,603)
Stranded tax effect resulting from the Tax Cuts and Jobs Act	(5,540)
Stockholders' equity, adjusted balance	(33,143)
Other comprehensive income (loss) before reclassifications		0	0	0	0
Amounts reclassified from AOCI		549	550	325	324
Other comprehensive income (loss), net		549	550	325	324
Ending Balance		(37,959)	(38,508)	(32,494)	(32,819)	(37,959)	(32,494)
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(15,285)	(17,506)	(18,014)	(14,618)	(15,285)	(18,014)	(15,285)
Stranded tax effect resulting from the Tax Cuts and Jobs Act	0
Stockholders' equity, adjusted balance	(15,285)
Other comprehensive income (loss) before reclassifications		(406)	508	(2,771)	667
Amounts reclassified from AOCI		0	0	0	0
Other comprehensive income (loss), net		(406)	508	(2,771)	667
Ending Balance		(17,912)	(17,506)	(17,389)	(14,618)	(17,912)	(17,389)
Total
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(42,888)	(56,014)	(57,072)	(47,437)	(42,888)	(57,072)	(42,888)
Stockholders' equity, adjusted balance	$ (48,428)
Other comprehensive income (loss), net		143		(2,446)		1,201	(1,455)
Ending Balance		$ (55,871)	$ (56,014)	$ (49,883)	$ (47,437)	$ (55,871)	$ (49,883)

Revenue and Customers - Additio

Revenue and Customers - Additional Information (Details)	6 Months Ended
	Jun. 30, 2019
Revenue from Contract with Customer [Abstract]
Payment term	P30D

Revenue and Customers - Receiva

Revenue and Customers - Receivables, Contract Assets, and Contract Liabilities with Customers (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Current contract assets	$ 21,635	$ 25,298
Noncurrent contract assets	18,484	22,366
Total contract assets	40,119	47,664
Current contract liabilities (deferred revenue)	(31,063)	(32,906)
Noncurrent contract liabilities (deferred revenue)	(46,740)	(47,847)
Total contract liabilities	$ (77,803)	$ (80,753)

Revenue and Customers - Signifi

Revenue and Customers - Significant Changes in Contract Assets and Contract Liabilities (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019USD ($)
Change In Contract With Customer, Asset And Liability [Roll Forward]
Contract assets, beginning balance	$ 47,664
Contract liabilities, beginning balance	(80,753)
Amortization of deferred costs	(16,811)
Additions to deferred costs	9,266
Amortization of deferred revenue	28,907
Additions to deferred revenue	(25,957)
Total	(7,545)
Total	2,950
Contract assets, ending balance	40,119
Contract liabilities, ending balance	$ (77,803)

Revenue and Customers - Remaini

Revenue and Customers - Remaining Performance Obligations (Details) $ in Thousands	Jun. 30, 2019USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01
Revenue from Contract with Customer [Abstract]
Performance obligation, expected timing of satisfaction	6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligations	$ 17,118
Performance obligation, expected timing of satisfaction	6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue from Contract with Customer [Abstract]
Performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligations	$ 25,726
Performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue from Contract with Customer [Abstract]
Performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligations	$ 21,347
Performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue from Contract with Customer [Abstract]
Performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligations	$ 10,046
Performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue from Contract with Customer [Abstract]
Performance obligation, expected timing of satisfaction
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligations	$ 3,566
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	$ 77,803
Floaters | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligations	8,848
Floaters | 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	16,466
Floaters | 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	15,742
Floaters | 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	9,248
Floaters | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligations	3,566
Floaters | 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	53,870
Jackups | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligations	8,270
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	9,260
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	5,605
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	798
Jackups | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
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	$ 23,933

Revenue and Customers - Disaggr

Revenue and Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 292,936	$ 258,369	$ 575,824	$ 493,526
Floaters
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	144,079	134,079	297,233	254,715
Jackups
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	130,738	113,610	248,085	222,080
Contract drilling services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 274,817	$ 247,689	$ 545,318	$ 476,795

Leases - Supplemental balance s

Leases - Supplemental balance sheet information (Details) $ in Thousands	Jun. 30, 2019USD ($)
Leases [Abstract]
Operating lease right-of-use assets	$ 28,895
Current operating lease liabilities	4,674
Long-term operating lease liabilities	$ 23,759
Weighted average remaining lease term for operating leases (years)	8 years 9 months 18 days
Weighted average discounted rate for operating leases	9.60%

Leases - Components of lease co

Leases - Components of lease cost (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Leases [Abstract]
Operating lease cost	$ 1,714	$ 3,573
Short-term lease cost	2,357	4,409
Variable lease cost	216	745
Total lease cost	$ 4,287	$ 8,727

Leases - Supplemental cash flow

Leases - Supplemental cash flow information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Leases [Abstract]
Operating cash flows from operating leases	$ 1,641	$ 3,841

Leases - Maturities of lease li

Leases - Maturities of lease liabilities (Details) $ in Thousands	Jun. 30, 2019USD ($)
Leases [Abstract]
2019 (remainder)	$ 3,403
2020	6,634
2021	4,930
2022	3,867
2023	3,473
Thereafter	22,421
Total lease payments	44,728
Less: Interest	(16,295)
Present value of lease liability	$ 28,433

Income Taxes (Details)

Income Taxes (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)Rig	Dec. 31, 2018USD ($)
Income Tax Disclosure [Abstract]
Reserves for uncertain tax positions net	$ 161.6		$ 183.8
Related tax benefits	$ 1		$ 1
Operational period	12 months
Provision for settlement of examination of U.S. tax returns	$ 33.7
Provision for non-cash items related to impairment of three rigs and certain capital spares		$ 35.6
Number of impaired rigs | Rig		3

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 0	$ 0	$ 0	$ 0
Service cost	0	0		0
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Interest cost	431,000	354,000	876,000	819,000
Return on plan assets	(614,000)	(710,000)	(1,248,000)	(1,426,000)
Recognized net actuarial loss	2,000	0	5,000	0
Net pension benefit cost (gain)	(181,000)	(356,000)	(367,000)	(607,000)
U.S.
Defined Benefit Plan Disclosure [Line Items]
Interest cost	2,178,000	2,044,000	4,356,000	4,089,000
Return on plan assets	(2,579,000)	(2,978,000)	(5,157,000)	(5,957,000)
Recognized net actuarial loss	693,000	411,000	1,385,000	822,000
Net pension benefit cost (gain)	$ 292,000	$ (523,000)	$ 584,000	$ (1,046,000)

Fair Value of Financial Instr_3

Fair Value of Financial Instruments - Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Quoted Prices in Active Markets (Level 1)
Assets -
Marketable securities	$ 7,675	$ 8,659
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	$ 7,675	$ 8,659

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Thousands	Dec. 15, 2017USD ($)	Jan. 31, 2017USD ($)Rig	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)
Other Commitments [Line Items]
Net loss from discontinued operations, net of tax			$ 0	$ 0	$ (3,821)	$ 0
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%
Income and other business taxes | Mexico | Foreign tax authority
Other Commitments [Line Items]
Approximate audit claims assessed					$ 52,600
Transocean Ltd.
Other Commitments [Line Items]
Number of newbuild rigs allegedly violating patents | Rig		5
Damages sought		$ 10,000
License fees		5.00%
Paragon Offshore
Other Commitments [Line Items]
Damages sought	$ 1,700,000
Loss estimate			$ 100,000		100,000
Coverage limit					150,000
Paragon Offshore | Mexico
Other Commitments [Line Items]
Net loss from discontinued operations, net of tax					$ 3,800

Supplemental Financial Inform_3

Supplemental Financial Information - Additional Information (Details) - USD ($) $ in Millions	Feb. 28, 2019	Feb. 28, 2019	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Condensed Balance Sheet Statements, Captions [Line Items]
Restricted cash			$ 1.3	$ 0.7
Capital expenditures incurred but not yet paid			$ 46.8	$ 52.1	$ 34.1	$ 25.5
Seller-financed secured loan due February 2023
Condensed Balance Sheet Statements, Captions [Line Items]
Financed value	$ 53.6	$ 53.6

Supplemental Financial Inform_4

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, 2019	Jun. 30, 2018
Operating Capital [Line Items]
Total net change in assets and liabilities	$ (50,161)	$ (33,524)
Noble-UK
Operating Capital [Line Items]
Accounts receivable	(21,767)	(7,533)
Other current assets	3,194	6,534
Other assets	5,166	(15,049)
Accounts payable	(3,197)	1,014
Other current liabilities	(27,575)	(10,094)
Other liabilities	(5,982)	(8,396)
Total net change in assets and liabilities	(50,161)	(33,524)
Noble-Cayman
Operating Capital [Line Items]
Accounts receivable	(21,767)	(7,533)
Other current assets	2,605	5,962
Other assets	6,582	(12,426)
Accounts payable	(3,105)	993
Other current liabilities	(27,422)	(9,680)
Other liabilities	(5,982)	(8,396)
Total net change in assets and liabilities	$ (49,089)	$ (31,080)

Condensed Consolidating Finan_3

Condensed Consolidating Financial Information - Guarantor Obligations (Details)	Jun. 30, 2019
4.90% Senior Notes due August 2020
Guarantor Obligations [Line Items]
Interest rate on senior notes	4.90%
4.625% Senior Notes due March 2021
Guarantor Obligations [Line Items]
Interest rate on senior notes	4.625%
3.95% Senior Notes due March 2022
Guarantor Obligations [Line Items]
Interest rate on senior notes	3.95%
7.75% Senior Notes due January 2024
Guarantor Obligations [Line Items]
Interest rate on senior notes	7.75%
7.95% Senior Notes due April 2025
Guarantor Obligations [Line Items]
Interest rate on senior notes	7.95%
6.20% Senior Notes due August 2040
Guarantor Obligations [Line Items]
Interest rate on senior notes	6.20%
6.05% Senior Notes due March 2041
Guarantor Obligations [Line Items]
Interest rate on senior notes	6.05%
5.25% Senior Notes due March 2042
Guarantor Obligations [Line Items]
Interest rate on senior notes	5.25%
8.95% Senior Notes due April 2045
Guarantor Obligations [Line Items]
Interest rate on senior notes	8.95%

Condensed Consolidating Finan_4

Condensed Consolidating Financial Information - Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 153,766		$ 375,232
Accounts receivable	222,889		200,722
Taxes receivable	25,682		20,498
Prepaid expenses and other current assets	59,757		62,604
Total current assets	462,094		659,056
Property and equipment, at cost	11,080,690		10,956,412
Accumulated depreciation	(2,621,100)		(2,475,694)
Property and equipment, net	8,459,590		8,480,718
Other assets	139,035		125,149
Total assets	9,060,719		9,264,923
Current liabilities
Current maturities of long-term debt	300,000		0
Accounts payable	118,040		125,557
Accrued payroll and related costs	40,722		50,284
Taxes payable	25,513		29,386
Interest payable	89,153		100,100
Other current liabilities	161,361		60,130
Total current liabilities	734,789		365,457
Long-term debt	3,553,088		3,877,402
Deferred income taxes	70,872		91,695
Other liabilities	274,221		275,795
Total liabilities	4,632,970		4,610,349
Commitments and contingencies
Shareholders’ equity	4,036,649		4,253,171
Noncontrolling interests	391,100		401,403
Total equity	4,427,749	$ 4,583,808	4,654,574	$ 4,774,595	$ 5,658,842	$ 5,950,628
Total liabilities and equity	9,060,719		9,264,923
Noble Corp
Current assets
Cash and cash equivalents	153,703		374,375
Accounts receivable	222,889		200,722
Taxes receivable	25,682		20,498
Short-term notes receivable from affiliates			0
Accounts receivable from affiliates	0		0
Prepaid expenses and other current assets	59,659		61,917
Total current assets	461,933		657,512
Property and equipment, at cost	11,080,690		10,956,412
Accumulated depreciation	(2,621,100)		(2,475,694)
Property and equipment, net	8,459,590		8,480,718
Notes receivable from affiliates	0		0
Investments in affiliates	0		0
Other assets	139,035		125,149
Total assets	9,060,558		9,263,379
Current liabilities
Short-term notes payables to affiliates			0
Current maturities of long-term debt	300,000		0
Accounts payable	117,812		125,237
Accrued payroll and related costs	40,733		50,284
Accounts payable to affiliates	0		0
Taxes payable	25,513		29,386
Interest payable	89,153		100,100
Other current liabilities	61,361		60,012
Total current liabilities	634,572		365,019
Long-term debt	3,553,088		3,877,402
Notes payable to affiliates	0		0
Deferred income taxes	70,872		91,695
Other liabilities	274,221		275,795
Total liabilities	4,532,753		4,609,911
Commitments and contingencies
Shareholders’ equity	4,136,705		4,252,065
Noncontrolling interests	391,100		401,403
Total equity	4,527,805	$ 4,583,475	4,653,468	$ 4,774,138	$ 5,658,292	$ 5,950,014
Total liabilities and equity	9,060,558		9,263,379
Noble Corp | Consolidating Adjustments
Current assets
Cash and cash equivalents	0		0
Accounts receivable	0		0
Taxes receivable	0		0
Short-term notes receivable from affiliates			(3,175,662)
Accounts receivable from affiliates	(5,977,718)		(5,160,674)
Prepaid expenses and other current assets	0		0
Total current assets	(5,977,718)		(8,336,336)
Property and equipment, at cost	0		0
Accumulated depreciation	0		0
Property and equipment, net	0		0
Notes receivable from affiliates	(33,145)		(5,145)
Investments in affiliates	(16,585,387)		(20,016,908)
Other assets	0		0
Total assets	(22,596,250)		(28,358,389)
Current liabilities
Short-term notes payables to affiliates			(3,175,662)
Current maturities of long-term debt	0
Accounts payable	0		0
Accrued payroll and related costs	0		0
Accounts payable to affiliates	(5,977,718)		(5,160,674)
Taxes payable	0		0
Interest payable			0
Other current liabilities	0		0
Total current liabilities	(5,977,718)		(8,336,336)
Long-term debt	0		0
Notes payable to affiliates	(33,145)		(5,145)
Deferred income taxes	0		0
Other liabilities	0		0
Total liabilities	(6,010,863)		(8,341,481)
Commitments and contingencies
Shareholders’ equity	(16,585,387)		(20,016,908)
Noncontrolling interests	0		0
Total equity	(16,585,387)		(20,016,908)
Total liabilities and equity	(22,596,250)		(28,358,389)
Noble Corp | Noble-Cayman | Reportable Legal Entities
Current assets
Cash and cash equivalents	0		0
Accounts receivable	0		0
Taxes receivable	0		0
Short-term notes receivable from affiliates			0
Accounts receivable from affiliates	653,968		275,726
Prepaid expenses and other current assets	327		0
Total current assets	654,295		275,726
Property and equipment, at cost	0		0
Accumulated depreciation	0		0
Property and equipment, net	0		0
Notes receivable from affiliates	5,145		5,145
Investments in affiliates	7,798,404		7,716,068
Other assets	0		609
Total assets	8,457,844		7,997,548
Current liabilities
Short-term notes payables to affiliates			0
Current maturities of long-term debt	300,000
Accounts payable	16		45
Accrued payroll and related costs	0		0
Accounts payable to affiliates	4,000,510		3,725,506
Taxes payable	0		0
Interest payable	684		3
Other current liabilities	0		0
Total current liabilities	4,301,210		3,725,554
Long-term debt	0		0
Notes payable to affiliates	0		0
Deferred income taxes	0		0
Other liabilities	19,929		19,929
Total liabilities	4,321,139		3,745,483
Commitments and contingencies
Shareholders’ equity	4,136,705		4,252,065
Noncontrolling interests	0		0
Total equity	4,136,705		4,252,065
Total liabilities and equity	8,457,844		7,997,548
Noble Corp | NHIL | Reportable Legal Entities
Current assets
Cash and cash equivalents	0		17,818
Accounts receivable	0		0
Taxes receivable	0		0
Short-term notes receivable from affiliates			0
Accounts receivable from affiliates	61,045		61,046
Prepaid expenses and other current assets	0		0
Total current assets	61,045		78,864
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	8,786,983		12,300,840
Other assets	0		0
Total assets	8,848,028		12,379,704
Current liabilities
Short-term notes payables to affiliates			3,175,662
Current maturities of long-term debt	0
Accounts payable	0		0
Accrued payroll and related costs	0		0
Accounts payable to affiliates	1,262,194		1,098,395
Taxes payable	113		0
Interest payable	85,057		99,997
Other current liabilities	0		0
Total current liabilities	1,347,364		4,374,054
Long-term debt	3,387,002		3,817,153
Notes payable to affiliates	28,000		0
Deferred income taxes	0		0
Other liabilities	0		0
Total liabilities	4,762,366		8,191,207
Commitments and contingencies
Shareholders’ equity	4,085,662		4,188,497
Noncontrolling interests	0		0
Total equity	4,085,662		4,188,497
Total liabilities and equity	8,848,028		12,379,704
Noble Corp | Other Non-guarantor Subsidiaries of Noble | Reportable Legal Entities
Current assets
Cash and cash equivalents	153,703		356,557
Accounts receivable	222,889		200,722
Taxes receivable	25,682		20,498
Short-term notes receivable from affiliates			3,175,662
Accounts receivable from affiliates	5,262,705		4,823,902
Prepaid expenses and other current assets	59,332		61,917
Total current assets	5,724,311		8,639,258
Property and equipment, at cost	11,080,690		10,956,412
Accumulated depreciation	(2,621,100)		(2,475,694)
Property and equipment, net	8,459,590		8,480,718
Notes receivable from affiliates	28,000		0
Investments in affiliates	0		0
Other assets	139,035		124,540
Total assets	14,350,936		17,244,516
Current liabilities
Short-term notes payables to affiliates			0
Current maturities of long-term debt	0
Accounts payable	117,796		125,192
Accrued payroll and related costs	40,733		50,284
Accounts payable to affiliates	715,014		336,773
Taxes payable	25,400		29,386
Interest payable	3,412		100
Other current liabilities	61,361		60,012
Total current liabilities	963,716		601,747
Long-term debt	166,086		60,249
Notes payable to affiliates	5,145		5,145
Deferred income taxes	70,872		91,695
Other liabilities	254,292		255,866
Total liabilities	1,460,111		1,014,702
Commitments and contingencies
Shareholders’ equity	12,499,725		15,828,411
Noncontrolling interests	391,100		401,403
Total equity	12,890,825		16,229,814
Total liabilities and equity	$ 14,350,936		$ 17,244,516

Condensed Consolidating Finan_5

Condensed Consolidating Financial Information - Operations and Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Operating revenues
Revenue from contract with customer	$ 292,936		$ 258,369		$ 575,824	$ 493,526
Operating costs and expenses
Depreciation and amortization	111,148		129,681		220,726	258,436
General and administrative	116,252		21,717		132,251	43,800
Loss on impairment	0		792,843		0	792,843
Total operating costs and expenses	411,646		1,103,975		718,346	1,396,012
Operating loss	(118,710)		(845,606)		(142,522)	(902,486)
Other income (expense)
Interest income (expense), net of amounts capitalized	(68,976)		(74,130)		(139,220)	(150,145)
Gain (loss) on extinguishment of debt, net	0		0		31,266	(8,768)
Interest income and other, net	1,860		2,865		4,366	4,204
Loss from continuing operations before income taxes	(185,826)		(916,871)		(246,110)	(1,057,195)
Income tax benefit	37,182		38,839		34,317	35,843
Net loss from continuing operations	(148,644)		(878,032)		(211,793)	(1,021,352)
Net loss from discontinued operations, net of tax	0		0		(3,821)	0
Net loss	(148,644)		(878,032)		(215,614)	(1,021,352)
Net (income) loss attributable to noncontrolling interests	(3,316)		249,969		(7,235)	250,955
Net income (loss) attributable to the company	(151,960)		(628,063)		(222,849)	(770,397)
Other comprehensive income, net	143	$ 1,058	(2,446)	$ 991	1,201	(1,455)
Comprehensive income (loss) attributable to the company	(151,817)		(630,509)		(221,648)	(771,852)
Noble Corp
Operating revenues
Revenue from contract with customer	292,936		258,369		575,824	493,526
Operating costs and expenses
Depreciation and amortization	110,538		128,173		219,310	255,812
General and administrative	8,672		8,121		16,267	21,578
Loss on impairment	0		792,843		0	792,843
Total operating costs and expenses	303,037		1,088,182		599,661	1,370,035
Operating loss	(10,101)		(829,813)		(23,837)	(876,509)
Other income (expense)
Income (loss) of unconsolidated affiliates	0		0		0	0
Income (loss) of unconsolidated affiliates - discontinued operations, net of tax					0
Interest income (expense), net of amounts capitalized	(68,976)		(74,130)		(139,220)	(150,145)
Gain (loss) on extinguishment of debt, net	0		0		31,266	(8,768)
Interest income and other, net	1,860		2,851		4,366	4,197
Loss from continuing operations before income taxes	(77,217)		(901,092)		(127,425)	(1,031,225)
Income tax benefit	37,182		38,733		34,317	35,737
Net loss from continuing operations	(40,035)		(862,359)		(93,108)	(995,488)
Net loss from discontinued operations, net of tax	0		0		(3,821)	0
Net loss	(40,035)		(862,359)		(96,929)	(995,488)
Net (income) loss attributable to noncontrolling interests	(3,316)		249,969		(7,235)	250,955
Net income (loss) attributable to the company	(43,351)		(612,390)		(104,164)	(744,533)
Other comprehensive income, net	143		(2,446)		1,201	(1,455)
Comprehensive income (loss) attributable to the company	(43,208)		(614,836)		(102,963)	(745,988)
Noble Corp | Consolidating Adjustments
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	0		0		0	0
Loss on impairment			0			0
Total operating costs and expenses	0		0		0	0
Operating loss	0		0		0	0
Other income (expense)
Income (loss) of unconsolidated affiliates	40,314		977,286		93,838	1,095,584
Income (loss) of unconsolidated affiliates - discontinued operations, net of tax					7,642
Interest income (expense), net of amounts capitalized	625		43,545		5,504	87,796
Gain (loss) on extinguishment of debt, net					0	0
Interest income and other, net	(625)		(43,545)		(5,504)	(87,796)
Loss from continuing operations before income taxes	40,314		977,286		101,480	1,095,584
Income tax benefit	0		0		0	0
Net loss from continuing operations					101,480
Net loss from discontinued operations, net of tax					0
Net loss	40,314		977,286		101,480	1,095,584
Net (income) loss attributable to noncontrolling interests	0		0		0	0
Net income (loss) attributable to the company	40,314		977,286		101,480	1,095,584
Other comprehensive income, net	(143)		2,446		(1,201)	1,455
Comprehensive income (loss) attributable to the company	40,171		979,732		100,279	1,097,039
Noble Corp | 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	0		32		0	65
Loss on impairment			0			0
Total operating costs and expenses	16		106		51	220
Operating loss	(16)		(106)		(51)	(220)
Other income (expense)
Income (loss) of unconsolidated affiliates	(40,105)		(613,855)		(95,813)	(744,671)
Income (loss) of unconsolidated affiliates - discontinued operations, net of tax					(3,821)
Interest income (expense), net of amounts capitalized	(3,301)		(15)		(4,619)	(460)
Gain (loss) on extinguishment of debt, net					0	(2,336)
Interest income and other, net	71		1,586		140	3,154
Loss from continuing operations before income taxes	(43,351)		(612,390)		(104,164)	(744,533)
Income tax benefit	0		0		0	0
Net loss from continuing operations					(104,164)
Net loss from discontinued operations, net of tax					0
Net loss	(43,351)		(612,390)		(104,164)	(744,533)
Net (income) loss attributable to noncontrolling interests	0		0		0	0
Net income (loss) attributable to the company	(43,351)		(612,390)		(104,164)	(744,533)
Other comprehensive income, net	143		(2,446)		1,201	(1,455)
Comprehensive income (loss) attributable to the company	(43,208)		(614,836)		(102,963)	(745,988)
Noble Corp | 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	170		565		173	1,183
Loss on impairment			0			0
Total operating costs and expenses	170		1,358		173	2,580
Operating loss	(170)		(1,358)		(173)	(2,580)
Other income (expense)
Income (loss) of unconsolidated affiliates	(209)		(363,431)		1,975	(350,913)
Income (loss) of unconsolidated affiliates - discontinued operations, net of tax					(3,821)
Interest income (expense), net of amounts capitalized	(61,184)		(105,771)		(132,761)	(225,592)
Gain (loss) on extinguishment of debt, net					31,266	5,419
Interest income and other, net	(3)		(2)		(10)	(131)
Loss from continuing operations before income taxes	(61,566)		(470,562)		(103,524)	(573,797)
Income tax benefit	0		0		0	0
Net loss from continuing operations					(103,524)
Net loss from discontinued operations, net of tax					0
Net loss	(61,566)		(470,562)		(103,524)	(573,797)
Net (income) loss attributable to noncontrolling interests	0		0		0	0
Net income (loss) attributable to the company	(61,566)		(470,562)		(103,524)	(573,797)
Other comprehensive income, net	0		0		0	0
Comprehensive income (loss) attributable to the company	(61,566)		(470,562)		(103,524)	(573,797)
Noble Corp | Other Non-guarantor Subsidiaries of Noble | Reportable Legal Entities
Operating revenues
Revenue from contract with customer	292,936		258,369		575,824	493,526
Operating costs and expenses
Depreciation and amortization	110,538		128,173		219,310	255,812
General and administrative	8,502		7,524		16,094	20,330
Loss on impairment			792,843			792,843
Total operating costs and expenses	302,851		1,086,718		599,437	1,367,235
Operating loss	(9,915)		(828,349)		(23,613)	(873,709)
Other income (expense)
Income (loss) of unconsolidated affiliates	0		0		0	0
Income (loss) of unconsolidated affiliates - discontinued operations, net of tax					0
Interest income (expense), net of amounts capitalized	(5,116)		(11,889)		(7,344)	(11,889)
Gain (loss) on extinguishment of debt, net					0	(11,851)
Interest income and other, net	2,417		44,812		9,740	88,970
Loss from continuing operations before income taxes	(12,614)		(795,426)		(21,217)	(808,479)
Income tax benefit	37,182		38,733		34,317	35,737
Net loss from continuing operations					13,100
Net loss from discontinued operations, net of tax					(3,821)
Net loss	24,568		(756,693)		9,279	(772,742)
Net (income) loss attributable to noncontrolling interests	(3,316)		249,969		(7,235)	250,955
Net income (loss) attributable to the company	21,252		(506,724)		2,044	(521,787)
Other comprehensive income, net	143		(2,446)		1,201	(1,455)
Comprehensive income (loss) attributable to the company	21,395		(509,170)		3,245	(523,242)
Contract drilling services
Operating revenues
Revenue from contract with customer	274,817		247,689		545,318	476,795
Operating costs and expenses
Cost of services	168,865		151,437		340,593	288,286
Contract drilling services | Noble Corp
Operating revenues
Revenue from contract with customer	274,817		247,689		545,318	476,795
Operating costs and expenses
Cost of services	168,446		150,748		339,308	287,155
Contract drilling services | Noble Corp | Consolidating Adjustments
Operating revenues
Revenue from contract with customer	0		0		0	0
Operating costs and expenses
Cost of services	0		0		0	0
Contract drilling services | Noble Corp | Noble-Cayman | Reportable Legal Entities
Operating revenues
Revenue from contract with customer	0		0		0	0
Operating costs and expenses
Cost of services	16		74		51	155
Contract drilling services | Noble Corp | NHIL | Reportable Legal Entities
Operating revenues
Revenue from contract with customer	0		0		0	0
Operating costs and expenses
Cost of services	0		793		0	1,397
Contract drilling services | Noble Corp | Other Non-guarantor Subsidiaries of Noble | Reportable Legal Entities
Operating revenues
Revenue from contract with customer	274,817		247,689		545,318	476,795
Operating costs and expenses
Cost of services	168,430		149,881		339,257	285,603
Reimbursables and other
Operating revenues
Revenue from contract with customer	18,119		10,680		30,506	16,731
Operating costs and expenses
Cost of services	15,381		8,297		24,776	12,647
Reimbursables and other | Noble Corp
Operating revenues
Revenue from contract with customer	18,119		10,680		30,506	16,731
Operating costs and expenses
Cost of services	15,381		8,297		24,776	12,647
Reimbursables and other | Noble Corp | 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 | Noble Corp | 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 | Noble Corp | 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 | Noble Corp | Other Non-guarantor Subsidiaries of Noble | Reportable Legal Entities
Operating revenues
Revenue from contract with customer	18,119		10,680		30,506	16,731
Operating costs and expenses
Cost of services	$ 15,381		$ 8,297		$ 24,776	$ 12,647

Condensed Consolidating Finan_6

Condensed Consolidating Financial Information - Cash Flows (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities
Net cash provided by operating activities	$ (7,462)	$ 53,894
Cash flows from investing activities
Capital expenditures	(152,354)	(75,874)
Proceeds from disposal of assets, net	9,367	3,755
Net cash used in investing activities	(142,987)	(72,119)
Cash flows from financing activities
Borrowings on credit facilities	370,000	0
Repayment of long-term debt	(400,000)	(952,209)
Repayments of credit facilities	(20,000)	0
Issuance of senior notes	0	750,000
Debt issuance costs	(90)	(14,802)
Dividends paid to noncontrolling interests	(17,538)	(12,694)
Net cash used in financing activities	(70,389)	(233,112)
Net decrease in cash, cash equivalents and restricted cash	(220,838)	(251,337)
Cash, cash equivalents and restricted cash, beginning of period	375,907	662,829
Cash, cash equivalents and restricted cash, end of period	155,069	411,492
Noble Corp
Cash flows from operating activities
Net cash provided by operating activities	10,855	79,554
Cash flows from investing activities
Capital expenditures	(152,354)	(75,874)
Proceeds from disposal of assets, net	9,367	3,755
Notes receivable from affiliates	0
Net cash used in investing activities	(142,987)	(72,119)
Cash flows from financing activities
Borrowings on credit facilities	370,000	0
Repayment of long-term debt	(400,000)	(952,209)
Repayments of credit facilities	(20,000)	0
Issuance of senior notes	0	750,000
Debt issuance costs	(90)	(14,802)
Early repayment of long-term debt	0
Premiums paid on early repayment of long-term debt	0
Dividends paid to noncontrolling interests	(17,538)	(12,694)
Distributions to parent company, net	(20,284)	(29,069)
Advances (to) from affiliates	0	0
Notes payable to affiliates	0
Net cash used in financing activities	(87,912)	(258,774)
Net decrease in cash, cash equivalents and restricted cash	(220,044)	(251,339)
Cash, cash equivalents and restricted cash, beginning of period	375,050	662,011
Cash, cash equivalents and restricted cash, end of period	155,006	410,672
Noble Corp | 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
Notes receivable from affiliates	28,000
Net cash used in investing activities	28,000	0
Cash flows from financing activities
Borrowings on credit facilities	0
Repayment of long-term debt	0	0
Repayments of credit facilities	0
Issuance of senior notes		0
Debt issuance costs	0	0
Early repayment of long-term debt	0
Premiums paid on early repayment of long-term debt	0
Dividends paid to noncontrolling interests	0	0
Distributions to parent company, net	0	0
Advances (to) from affiliates	0	0
Notes payable to affiliates	(28,000)
Net cash used in financing activities	(28,000)	0
Net decrease in cash, cash equivalents and restricted cash	0	0
Cash, cash equivalents and restricted cash, beginning of period	0	0
Cash, cash equivalents and restricted cash, end of period	0	0
Noble Corp | Noble-Cayman | Reportable Legal Entities
Cash flows from operating activities
Net cash provided by operating activities	4,572	15,220
Cash flows from investing activities
Capital expenditures	0	0
Proceeds from disposal of assets, net	0	0
Notes receivable from affiliates	0
Net cash used in investing activities	0	0
Cash flows from financing activities
Borrowings on credit facilities	300,000
Repayment of long-term debt	0	0
Repayments of credit facilities	0
Issuance of senior notes		0
Debt issuance costs	0	(822)
Early repayment of long-term debt	0
Premiums paid on early repayment of long-term debt	0
Dividends paid to noncontrolling interests	0	0
Distributions to parent company, net	(20,284)	(29,069)
Advances (to) from affiliates		14,925
Advances (to) from affiliates	(284,288)
Notes payable to affiliates	0
Net cash used in financing activities	(4,572)	(14,966)
Net decrease in cash, cash equivalents and restricted cash	0	254
Cash, cash equivalents and restricted cash, beginning of period	0	11
Cash, cash equivalents and restricted cash, end of period	0	265
Noble Corp | NHIL | Reportable Legal Entities
Cash flows from operating activities
Net cash provided by operating activities	(145,632)	(206,481)
Cash flows from investing activities
Capital expenditures	0	0
Proceeds from disposal of assets, net	0	0
Notes receivable from affiliates	0
Net cash used in investing activities	0	0
Cash flows from financing activities
Borrowings on credit facilities	0
Repayment of long-term debt	(400,000)	(738,555)
Repayments of credit facilities	0
Issuance of senior notes		750,000
Debt issuance costs	0	(12,581)
Early repayment of long-term debt	0
Premiums paid on early repayment of long-term debt	0
Dividends paid to noncontrolling interests	0	0
Distributions to parent company, net	0	0
Advances (to) from affiliates	499,814	178,293
Notes payable to affiliates	28,000
Net cash used in financing activities	127,814	177,157
Net decrease in cash, cash equivalents and restricted cash	(17,818)	(29,324)
Cash, cash equivalents and restricted cash, beginning of period	17,818	29,324
Cash, cash equivalents and restricted cash, end of period	0	0
Noble Corp | Other Non-guarantor Subsidiaries of Noble | Reportable Legal Entities
Cash flows from operating activities
Net cash provided by operating activities	151,915	270,815
Cash flows from investing activities
Capital expenditures	(152,354)	(75,874)
Proceeds from disposal of assets, net	9,367	3,755
Notes receivable from affiliates	(28,000)
Net cash used in investing activities	(170,987)	(72,119)
Cash flows from financing activities
Borrowings on credit facilities	70,000
Repayment of long-term debt	0	(213,654)
Repayments of credit facilities	(20,000)
Issuance of senior notes		0
Debt issuance costs	(90)	(1,399)
Early repayment of long-term debt	0
Premiums paid on early repayment of long-term debt	0
Dividends paid to noncontrolling interests	(17,538)	(12,694)
Distributions to parent company, net	0	0
Advances (to) from affiliates	(215,526)	(193,218)
Notes payable to affiliates	0
Net cash used in financing activities	(183,154)	(420,965)
Net decrease in cash, cash equivalents and restricted cash	(202,226)	(222,269)
Cash, cash equivalents and restricted cash, beginning of period	357,232	632,676
Cash, cash equivalents and restricted cash, end of period	$ 155,006	$ 410,407

Subsequent Events (Details)

Subsequent Events (Details) - Line of credit - 2017 Credit Facility matures January 2023 - USD ($)	Jul. 26, 2019	Jun. 30, 2019	Jan. 03, 2018
Subsequent Event [Line Items]
Maximum borrowing capacity under credit facilities		$ 1,500,000,000	$ 1,500,000,000
Subsequent Event
Subsequent Event [Line Items]
Maximum borrowing capacity under credit facilities	$ 1,300,000,000
Credit Facility
Subsequent Event [Line Items]
Maximum borrowing capacity under credit facilities		$ 300,000,000
Fiscal quarters ending September 30, 2019 through December 31, 2020 | Credit Facility | Subsequent Event
Subsequent Event [Line Items]
Maximum Senior Guaranteed Indebtedness to Adjusted EBITDA covenant	400.00%
Fiscal quarters ending March 31, 2021 through December 31, 2021 | Credit Facility | Subsequent Event
Subsequent Event [Line Items]
Maximum Senior Guaranteed Indebtedness to Adjusted EBITDA covenant	350.00%
Fiscal quarters ending March 31, 2022 and thereafter | Credit Facility | Subsequent Event
Subsequent Event [Line Items]
Maximum Senior Guaranteed Indebtedness to Adjusted EBITDA covenant	300.00%