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LONG-TERM DEBT - NARRATIVE (Details) - USD ($) shares in Millions	1 Months Ended	6 Months Ended	12 Months Ended
	Aug. 31, 2020	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Aug. 07, 2019	Jul. 01, 2019	Jun. 30, 2019
Debt Instrument [Line Items]
Debt instrument issued		$ 35,235,000,000	$ 35,235,000,000	$ 37,401,000,000
Variable-rate debt as a percentage of total debt		3.00%	3.00%	12.00%
WES
Debt Instrument [Line Items]
Common units exchanged to retire note payable (in units)	27.9
Note payable retired	$ 260,000,000
Loss on exchange	46,000,000
Gain on debt extinguished	$ 76,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity					$ 3,000,000,000.0
Dolphin Energy Limited
Debt Instrument [Line Items]
Limited recourse guarantees		$ 242,000,000	$ 242,000,000	$ 242,000,000
Level 1 | Fair Value
Debt Instrument [Line Items]
Estimated fair value of debt		33,800,000,000	33,800,000,000	$ 38,800,000,000
2-year variable rate term loan due 2021
Debt Instrument [Line Items]
Tender, purchase and repayments		2,500,000,000
Senior notes
Debt Instrument [Line Items]
Debt instrument issued		7,000,000,000.0	7,000,000,000.0
Senior notes | Zero Coupon senior notes due 2036
Debt Instrument [Line Items]
Debt instrument issued		$ 2,300,000,000	$ 2,300,000,000
Debt instrument interest rate stated percentage		5.24%	5.24%
Put in whole, amount		$ 1,000,000,000.0	$ 1,000,000,000.0
Senior notes | Senior Notes Due 2021
Debt Instrument [Line Items]
Tender, purchase and repayments		3,500,000,000
Senior notes | Senior Notes Due 2022
Debt Instrument [Line Items]
Tender, purchase and repayments		2,700,000,000
Senior notes | Senior Notes Due 2023
Debt Instrument [Line Items]
Tender, purchase and repayments		264,000,000
Senior notes | 0.00% senior notes due October 2036
Debt Instrument [Line Items]
Tender, purchase and repayments		$ 2,000,000
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity						$ 5,000,000,000.0	$ 3,000,000,000.0
Average annual facility fees			0.275%

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