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LONG-TERM DEBT - DEBT ISSUANCE, REPURCHASES, REPAYMENTS AND EXCHANGES (Details) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2020 USD ($)
Long-term Debt Rollforward [Roll Forward] |  |
Total borrowings at face value as of December 31, 2019 |  | $ 37,401,000,000
Total borrowings at face value as of December 31, 2020 | $ 35,235,000,000 | 35,235,000,000
Variable rate bonds due February 2021 | July Tender and Purchase |  |
Long-term Debt Rollforward [Roll Forward] |  |
Tender, purchase and repayments |  | (473,000,000)
Variable rate bonds due February 2021 | August and September Tender and Purchase |  |
Long-term Debt Rollforward [Roll Forward] |  |
Tender, purchase and repayments |  | (123,000,000)
Variable rate bonds due August 2022 | August and September Tender and Purchase |  |
Long-term Debt Rollforward [Roll Forward] |  |
Tender, purchase and repayments |  | $ (448,000,000)
6.500% note payable to WES due 2038 | August Exchange | WES |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 6.50% | 6.50%
Long-term Debt Rollforward [Roll Forward] |  |
Tender, purchase and repayments |  | $ (260,000,000)
2-year variable rate term loan due 2021 |  |
Long-term Debt Rollforward [Roll Forward] |  |
Tender, purchase and repayments | $ (2,500,000,000) |
2-year variable rate term loan due 2021 | September Repayment |  |
Debt Instrument [Line Items] |  |
Debt instrument, term |  | 2 years
Long-term Debt Rollforward [Roll Forward] |  |
Tender, purchase and repayments |  | $ (500,000,000)
2-year variable rate bonds due August 2021 | October Repayment |  |
Debt Instrument [Line Items] |  |
Debt instrument, term |  | 2 years
Long-term Debt Rollforward [Roll Forward] |  |
Tender, purchase and repayments |  | $ (377,000,000)
2-year variable rate term loan due September 2021 | October Repayment |  |
Debt Instrument [Line Items] |  |
Debt instrument, term |  | 2 years
Long-term Debt Rollforward [Roll Forward] |  |
Tender, purchase and repayments |  | $ (1,010,000,000)
2-year variable rate term loan due September 2021 | November Repayment |  |
Debt Instrument [Line Items] |  |
Debt instrument, term |  | 2 years
Long-term Debt Rollforward [Roll Forward] |  |
Tender, purchase and repayments |  | $ (232,000,000)
2-year variable rate term loan due September 2021 | December Repayment |  |
Debt Instrument [Line Items] |  |
Debt instrument, term |  | 2 years
Long-term Debt Rollforward [Roll Forward] |  |
Tender, purchase and repayments |  | $ (214,000,000)
Senior notes |  |
Long-term Debt Rollforward [Roll Forward] |  |
Total borrowings at face value as of December 31, 2020 | $ 7,000,000,000.0 | $ 7,000,000,000.0
Senior notes | 8.000% senior notes due 2025 | Issuance of July 2020 Notes |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 8.00% | 8.00%
Long-term Debt Rollforward [Roll Forward] |  |
Issuances |  | $ 500,000,000
Senior notes | 8.500% senior notes due 2027 | Issuance of July 2020 Notes |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 8.50% | 8.50%
Long-term Debt Rollforward [Roll Forward] |  |
Issuances |  | $ 500,000,000
Senior notes | 8.875% senior notes due 2030 | Issuance of July 2020 Notes |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 8.875% | 8.875%
Long-term Debt Rollforward [Roll Forward] |  |
Issuances |  | $ 1,000,000,000
Senior notes | 4.100% senior notes due February 2021 | July Tender and Purchase |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 4.10% | 4.10%
Long-term Debt Rollforward [Roll Forward] |  |
Tender, purchase and repayments |  | $ (943,000,000)
Senior notes | 4.100% senior notes due February 2021 | August and September Tender and Purchase |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 4.10% | 4.10%
Long-term Debt Rollforward [Roll Forward] |  |
Tender, purchase and repayments |  | $ (139,000,000)
Senior notes | 4.100% senior notes due February 2021 | December Repayment |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 4.10% | 4.10%
Long-term Debt Rollforward [Roll Forward] |  |
Tender, purchase and repayments |  | $ (167,000,000)
Senior notes | 4.850% senior notes due March 2021 | July Tender and Purchase |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 4.85% | 4.85%
Long-term Debt Rollforward [Roll Forward] |  |
Tender, purchase and repayments |  | $ (530,000,000)
Senior notes | 2.600% senior notes due August 2021 | July Tender and Purchase |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 2.60% | 2.60%
Long-term Debt Rollforward [Roll Forward] |  |
Tender, purchase and repayments |  | $ (51,000,000)
Senior notes | 2.600% senior notes due August 2021 | August and September Tender and Purchase |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 2.60% | 2.60%
Long-term Debt Rollforward [Roll Forward] |  |
Tender, purchase and repayments |  | $ (1,099,000,000)
Senior notes | 2.600% senior notes due August 2021 | December Tender and Purchase |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 2.60% | 2.60%
Long-term Debt Rollforward [Roll Forward] |  |
Tender, purchase and repayments |  | $ (126,000,000)
Senior notes | 5.875% senior notes due 2025 | Issuance of August 2020 Notes |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 5.875% | 5.875%
Long-term Debt Rollforward [Roll Forward] |  |
Issuances |  | $ 900,000,000
Senior notes | 6.375% senior notes due 2028 | Issuance of August 2020 Notes |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 6.375% | 6.375%
Long-term Debt Rollforward [Roll Forward] |  |
Issuances |  | $ 600,000,000
Senior notes | 6.625% senior notes due 2030 | Issuance of August 2020 Notes |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 6.625% | 6.625%
Long-term Debt Rollforward [Roll Forward] |  |
Issuances |  | $ 1,500,000,000
Senior notes | 2.600% senior notes due April 2022 | August and September Tender and Purchase |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 2.60% | 2.60%
Long-term Debt Rollforward [Roll Forward] |  |
Tender, purchase and repayments |  | $ (171,000,000)
Senior notes | 2.600% senior notes due April 2022 | December Tender and Purchase |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 2.60% | 2.60%
Long-term Debt Rollforward [Roll Forward] |  |
Tender, purchase and repayments |  | $ (128,000,000)
Senior notes | 2.700% senior notes due August 2022 | August and September Tender and Purchase |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 2.70% | 2.70%
Long-term Debt Rollforward [Roll Forward] |  |
Tender, purchase and repayments |  | $ (102,000,000)
Senior notes | 2.700% senior notes due August 2022 | December Tender and Purchase |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 2.70% | 2.70%
Long-term Debt Rollforward [Roll Forward] |  |
Tender, purchase and repayments |  | $ (1,269,000,000)
Senior notes | 2.700% senior notes due February 2023 | August and September Tender and Purchase |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 2.70% | 2.70%
Long-term Debt Rollforward [Roll Forward] |  |
Tender, purchase and repayments |  | $ (52,000,000)
Senior notes | 2.700% senior notes due February 2023 | December Tender and Purchase |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 2.70% | 2.70%
Long-term Debt Rollforward [Roll Forward] |  |
Tender, purchase and repayments |  | $ (212,000,000)
Senior notes | 0.00% senior notes due October 2036 |  |
Long-term Debt Rollforward [Roll Forward] |  |
Tender, purchase and repayments | $ (2,000,000) |
Senior notes | 0.00% senior notes due October 2036 | October Repayment |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 0.00% | 0.00%
Long-term Debt Rollforward [Roll Forward] |  |
Tender, purchase and repayments |  | $ (2,000,000)
Senior notes | 5.500% senior notes due 2025 | Issuance of December 2020 Notes |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 5.50% | 5.50%
Long-term Debt Rollforward [Roll Forward] |  |
Issuances |  | $ 750,000,000
Senior notes | 6.125% senior notes due 2031 | Issuance of December 2020 Notes |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 6.125% | 6.125%
Long-term Debt Rollforward [Roll Forward] |  |
Issuances |  | $ 1,250,000,000
Senior notes | 3.125% senior notes due February 2022 | December Tender and Purchase |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate stated percentage | 3.125% | 3.125%
Long-term Debt Rollforward [Roll Forward] |  |
Tender, purchase and repayments |  | $ (538,000,000)

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