Employee Benefit Plans - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Market cycle minimum period in which objective should be met over	3 years
Market cycle maximum period in which objective should be met over	5 years
Investment equity securities	$ 0	$ 0
Costs for maintaining contribution plans	25,000,000	27,600,000	$ 37,200,000
Restoration Plan
Defined Benefit Plan Disclosure [Line Items]
Liability under the restoration plan	$ 8,200,000	8,800,000
Noble Drilling Corporation Profit Sharing Plan
Defined Benefit Plan Disclosure [Line Items]
Number of years of service for the participants in the plan to become fully vested	3 years
Plan participants’ contributions	$ 2,300,000	3,100,000	6,000,000
Cash holdings
Defined Benefit Plan Disclosure [Line Items]
Percentage of company's overall investments	1.20%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of company's overall investments	31.50%
Debt security
Defined Benefit Plan Disclosure [Line Items]
Percentage of company's overall investments	67.30%
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Net actuarial losses and prior service costs	$ 100,000
Projected benefit obligation	0	0
Accumulated benefit obligation	$ 0	0
Defined benefit plan, investment within plan asset category, de-risking basis of gilts, percentage	(0.45%)
Defined benefit plan, investment within plan asset category, minimum outperformance versus cash, percentage	4.00%
Employer contributions	$ 0	651,000	2,800,000
Expected contribution to non-U.S. and U.S pension plans	$ 0
Non-U.S. | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of company's overall investments	48.00%
Non-U.S. | Debt security
Defined Benefit Plan Disclosure [Line Items]
Percentage of company's overall investments	52.00%
U.S.
Defined Benefit Plan Disclosure [Line Items]
Net actuarial losses and prior service costs	$ 2,800,000
Decrease in pension liability	600,000	1,600,000	2,900,000
Projected benefit obligation	210,944,000	235,175,000
Accumulated benefit obligation	210,944,000	235,175,000
Employer contributions	4,553,000	2,348,000	$ 400,000
Expected contribution to non-U.S. and U.S pension plans	1,100,000
U.S. | Unfunded excess benefit plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	10,500,000	16,400,000
Accumulated benefit obligation	$ 10,500,000	$ 16,400,000