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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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