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Debt (Details) - USD ($)				1 Months Ended	3 Months Ended
Debt (Details) - USD ($)	Apr. 28, 2020	Feb. 03, 2020	Jan. 21, 2020	Apr. 30, 2020	Mar. 31, 2020	Mar. 31, 2019	Aug. 01, 2020	May 01, 2020	Dec. 31, 2019	May 31, 2019
Line of Credit Facility
Repayment of borrowing on credit facility					$ 500,000,000	$ 1,270,000,000
Term loan facility borrowings					$ 799,574,000				$ 999,353,000
Subsequent Event
Line of Credit Facility
Payment of debt premium charges	$ 32,500,000
Term loan facility borrowings								$ 350,000,000
Strike price (per share)	$ 15.00
Capped price (per share)	$ 18.75
Senior Notes \| Scenario, Forecast
Line of Credit Facility
Additional interest rate limit (percent)							2.00%
Term Loan Agreement \| Unsecured Debt
Line of Credit Facility
Face amount										$ 1,000,000,000.0
Interest rate, stated percentage (percent)					1.25%				1.00%
Weighted average interest rate (percent)					2.80%
Repayments of debt			$ 200,000,000
Term Loan Agreement \| Unsecured Debt \| Subsequent Event
Line of Credit Facility
Basis spread on variable rate (percent)	1.50%
Repayment of borrowing on credit facility	$ 450,000,000
Senior Notes Due February 2025 \| Senior Notes
Line of Credit Facility
Face amount			$ 1,000,000,000.0
Interest rate, stated percentage (percent)			6.125%
Senior Notes Due February 2025 \| Senior Notes \| Scenario, Forecast
Line of Credit Facility
Interest rate, stated percentage (percent)							7.875%
Senior Notes Due February 2030 \| Senior Notes
Line of Credit Facility
Face amount			$ 750,000,000
Interest rate, stated percentage (percent)			7.00%
Senior Notes Due February 2030 \| Senior Notes \| Scenario, Forecast
Line of Credit Facility
Interest rate, stated percentage (percent)							8.75%
Floating Rate Notes Due 2020 \| Senior Notes
Line of Credit Facility
Repayments of debt			$ 500,000,000
Redemption price, percentage (percent)		100.00%
Interest expense, debt			$ 1,200,000
2.50 Senior Notes Due 2020 \| Senior Notes
Line of Credit Facility
Interest rate, stated percentage (percent)			2.50%
Repayments of debt			$ 500,000,000
Redemption price, percentage (percent)			100.446%
Interest expense, debt			$ 4,200,000
Redemption premium			$ 2,200,000
Senior Notes Due November 2021 \| Senior Notes
Line of Credit Facility
Interest rate, stated percentage (percent)			4.875%
Repayments of debt			$ 500,000,000
Interest expense, debt			7,400,000
Payments to repurchase senior notes			517,400,000
Early tender premium			$ 10,000,000.0
Senior Notes Due November 2021 \| Senior Notes \| Subsequent Event
Line of Credit Facility
Interest rate, stated percentage (percent)				4.875%
Payments to repurchase senior notes				$ 4,600,000
1.75% Senior Notes Due 2026 \| Senior Notes \| Subsequent Event
Line of Credit Facility
Face amount	$ 500,000,000
Interest rate, stated percentage (percent)	1.75%
Revolving credit facility \| EQT 2.5 Billion Facility
Line of Credit Facility
Line of credit facility, maximum borrowing capacity					$ 2,500,000,000
Letters of credit outstanding under revolving credit facility					700,000,000				$ 0
Maximum amount of outstanding short-term loans at any time during the period					400,000,000	1,100,000,000
Average daily balance of short-term loans outstanding during the period					$ 100,000,000	$ 600,000,000
Weighted average interest rates of average daily balance of short-term loans (percent)					3.20%	4.00%
Revolving credit facility \| EQT 2.5 Billion Facility \| Base Rate
Line of Credit Facility
Basis spread on variable rate (percent)					0.75%
Revolving credit facility \| EQT 2.5 Billion Facility \| Eurodollar
Line of Credit Facility
Basis spread on variable rate (percent)					1.75%
Revolving credit facility \| EQT 2.5 Billion Facility \| Subsequent Event
Line of Credit Facility
Letters of credit outstanding under revolving credit facility								900,000,000
Maximum exposure								$ 1,100,000,000
Revolving credit facility \| EQT 2.5 Billion Facility \| Subsequent Event \| Base Rate
Line of Credit Facility
Basis spread on variable rate (percent)	1.00%
Revolving credit facility \| EQT 2.5 Billion Facility \| Subsequent Event \| Eurodollar
Line of Credit Facility
Basis spread on variable rate (percent)	2.00%