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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.

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- Narrative (Details)		3 Months Ended
- Narrative (Details)	Feb. 01, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018 USD ($)
Long-Term Debt Instrument [Line Items]
Debt instrument, principal amount		$ 10,161,000,000						$ 8,168,000,000
Senior notes
Long-Term Debt Instrument [Line Items]
Repayments of senior debt		$ 380,000,000
Debt redemption, percent of principal amount of notes to be redeemed		100.00%
Debt redemption, percent of aggregate amount of notes to be redeemed		35.00%
Senior notes \| 8.00% senior notes due 2026
Long-Term Debt Instrument [Line Items]
Debt instrument, principal amount		$ 919,000,000						0
Interest rate, stated percentage		8.00%
Senior notes \| 6.875% senior notes due 2025
Long-Term Debt Instrument [Line Items]
Debt instrument, principal amount	$ 700,000,000	$ 700,000,000						0
Interest rate, stated percentage	6.875%	6.875%
Debt covenant, basket	$ 25,000,000
Revolving credit facility \| Chesapeake revolving credit facility
Long-Term Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 3,000,000,000.0
Line of credit facility, maximum borrowing capacity, increased maximum		4,000,000,000.0
Letters of credit outstanding, amount		54,000,000
Leverage ratio	4.00
Revolving credit facility \| BVL revolving credit facility
Long-Term Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		2,000,000,000.0
Line of credit facility, current borrowing capacity		$ 1,300,000,000
Mortgage guarantee, secured percent on proved reserves		85.00%
Ratio of net debt to EBITDAX	4.00
Ratio of funded debt to EBITDAX	4.00
Current Ratio	1.00
Revolving credit facility \| Line of credit \| Chesapeake revolving credit facility
Long-Term Debt Instrument [Line Items]
Debt instrument, principal amount		$ 1,372,000,000						419,000,000
Revolving credit facility \| Line of credit \| BVL revolving credit facility
Long-Term Debt Instrument [Line Items]
Debt instrument, principal amount		$ 686,000,000						$ 0
Minimum \| Revolving credit facility \| BVL revolving credit facility
Long-Term Debt Instrument [Line Items]
Commitment fee	0.375%
Minimum \| Alternative Base Rate (ABR) \| Revolving credit facility \| Chesapeake revolving credit facility
Long-Term Debt Instrument [Line Items]
Variable rate percentage	0.50%
Minimum \| Alternative Base Rate (ABR) \| Revolving credit facility \| BVL revolving credit facility
Long-Term Debt Instrument [Line Items]
Variable rate percentage	0.50%
Minimum \| Eurodollar \| Revolving credit facility \| BVL revolving credit facility
Long-Term Debt Instrument [Line Items]
Variable rate percentage	1.50%
Minimum \| London Interbank Offered Rate (LIBOR) \| Revolving credit facility \| Chesapeake revolving credit facility
Long-Term Debt Instrument [Line Items]
Variable rate percentage	1.50%
Minimum \| London Interbank Offered Rate (LIBOR) \| Revolving credit facility \| BVL revolving credit facility
Long-Term Debt Instrument [Line Items]
Variable rate percentage	1.50%
Maximum \| Revolving credit facility \| BVL revolving credit facility
Long-Term Debt Instrument [Line Items]
Commitment fee	0.50%
Maximum \| Alternative Base Rate (ABR) \| Revolving credit facility \| Chesapeake revolving credit facility
Long-Term Debt Instrument [Line Items]
Variable rate percentage	2.00%
Maximum \| Alternative Base Rate (ABR) \| Revolving credit facility \| BVL revolving credit facility
Long-Term Debt Instrument [Line Items]
Variable rate percentage	1.50%
Maximum \| Eurodollar \| Revolving credit facility \| BVL revolving credit facility
Long-Term Debt Instrument [Line Items]
Variable rate percentage	2.50%
Maximum \| London Interbank Offered Rate (LIBOR) \| Revolving credit facility \| Chesapeake revolving credit facility
Long-Term Debt Instrument [Line Items]
Variable rate percentage	3.00%
Maximum \| London Interbank Offered Rate (LIBOR) \| Revolving credit facility \| BVL revolving credit facility
Long-Term Debt Instrument [Line Items]
Variable rate percentage	2.50%
Forecast \| Revolving credit facility \| Chesapeake revolving credit facility
Long-Term Debt Instrument [Line Items]
Leverage ratio			4.00				5.50
Secured leverage ratio			2.50
Fixed charge coverage ratio				2.50	2.25	2.00