Income (Loss) Per Share - Computation of Basic and Diluted Earnings Per Share for Noble-UK (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended		8 Months Ended	9 Months Ended
	Feb. 05, 2021	Mar. 31, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Basic
Net loss from continuing operations	$ 250,228	$ (21,454)	$ (23,665)	$ (50,868)		$ (1,155,739)
Net loss from discontinued operations, net of tax	0	$ 0	0	0		0
Net income (loss)	250,228		(23,665)	(50,868)	$ (21,454)	(1,155,739)
Diluted
Net income (loss)	$ 250,228		$ (23,665)	$ (50,868)	$ (21,454)	$ (1,155,739)
Denominator:
Weighted average shares outstanding - basic (in shares)	251,115		66,623	251,058	61,847	250,696
Dilutive effect of share-based awards (in shares)	5,456		0	0	0	0
Weighted average shares outstanding - diluted (in shares)	256,571		66,623	251,058	61,847	250,696
Basic:
Net income (loss) (in usd per share)	$ 1.00		$ (0.36)	$ (0.20)	$ (0.35)	$ (4.61)
Diluted:
Net income (loss) (in usd per share)	$ 0.98		$ (0.36)	$ (0.20)	$ (0.35)	$ (4.61)