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LONG-TERM DEBT - NARRATIVE (Details) - USD ($) shares in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2022 | Aug. 31, 2020 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2021 | Dec. 30, 2021 | Dec. 31, 2019
Principal payments on long-term debt |  |  |  |  |  |  |  |  |  |
Aggregate future principal payments and carrying value |  |  | $ 28,493,000,000 |  |  |  | $ 35,235,000,000 | $ 28,493,000,000 |  |
Due next year |  |  | 101,000,000 |  |  |  |  | 101,000,000 |  |
Due in two years |  |  | 465,000,000 |  |  |  |  | 465,000,000 |  |
Due in three years |  |  | 1,700,000,000 |  |  |  |  | 1,700,000,000 |  |
Due in four years |  |  | 2,500,000,000 |  |  |  |  | 2,500,000,000 |  |
Due in five years and thereafter |  |  | 23,700,000,000 |  |  |  |  | 23,700,000,000 |  |
Face value |  |  | $ 28,493,000,000 |  |  |  | $ 35,235,000,000 | $ 28,493,000,000 |  | $ 37,401,000,000
Variable-rate debt as a percentage of total debt |  |  | 0.20% |  |  |  | 3.00% | 0.20% |  |
WES |  |  |  |  |  |  |  |  |  |
Principal payments on long-term debt |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Level 1 | Fair Value |  |  |  |  |  |  |  |  |  |
Principal payments on long-term debt |  |  |  |  |  |  |  |  |  |
Estimated fair value of debt |  |  | $ 31,100,000,000 |  |  |  | $ 33,800,000,000 | $ 31,100,000,000 |  |
2-year variable rate term loan due 2021 |  |  |  |  |  |  |  |  |  |
Principal payments on long-term debt |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  |  | 2,500,000,000 |  |  |
Senior notes |  |  |  |  |  |  |  |  |  |
Principal payments on long-term debt |  |  |  |  |  |  |  |  |  |
Face value |  |  |  |  |  |  | 7,000,000,000 |  |  |
Senior notes | Third quarter repayments |  |  |  |  |  |  |  |  |  |
Principal payments on long-term debt |  |  |  |  |  |  |  |  |  |
Cash tender |  |  |  | $ 3,000,000,000 |  |  |  |  |  |
Repayments of near-term maturities of debt |  |  |  | 224,000,000 |  |  |  |  |  |
Repayments of floating interest rate notes |  |  |  | 1,100,000,000 |  |  |  |  |  |
Senior notes | First quarter repayments |  |  |  |  |  |  |  |  |  |
Principal payments on long-term debt |  |  |  |  |  |  |  |  |  |
Repayments of near-term maturities of debt |  |  |  |  |  | $ 174,000,000 |  |  |  |
Senior notes | Second quarter repayments |  |  |  |  |  |  |  |  |  |
Principal payments on long-term debt |  |  |  |  |  |  |  |  |  |
Repayments of near-term maturities of debt |  |  |  |  | $ 0 |  |  |  |  |
Senior notes | 2.600% senior notes due April 2022 | Subsequent event |  |  |  |  |  |  |  |  |  |
Principal payments on long-term debt |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt | $ 101,000,000 |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage | 2.60% |  |  |  |  |  |  |  |  |
Face value | $ 28,400,000,000 |  |  |  |  |  |  |  |  |
Senior notes | Senior Notes Due from 2024 Through 2049 | Fourth quarter issuances (repayments) |  |  |  |  |  |  |  |  |  |
Principal payments on long-term debt |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  | 1,600,000,000 |  |  |  |  |  |  |
Face value of debt tendered and repurchased |  |  | 1,500,000,000 |  |  |  |  | 1,500,000,000 |  |
Senior notes | 2.700% senior notes due 2022 |  |  |  |  |  |  |  |  |  |
Principal payments on long-term debt |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  |  | 2,700,000,000 |  |  |
Senior notes | 2.700% senior notes due 2022 | Fourth quarter issuances (repayments) |  |  |  |  |  |  |  |  |  |
Principal payments on long-term debt |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  | 627,000,000 |  |  |  |  |  |  |
Senior notes | 2.700% senior notes due 2022 | Third quarter repayments |  |  |  |  |  |  |  |  |  |
Principal payments on long-term debt |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  | $ 278,000,000 |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  | 2.70% |  |  |  |  |  |
Senior notes | Senior Notes Due 2021 |  |  |  |  |  |  |  |  |  |
Principal payments on long-term debt |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  |  | 3,500,000,000 |  |  |
Senior notes | 2.700% senior notes due 2023 |  |  |  |  |  |  |  |  |  |
Principal payments on long-term debt |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  |  | 264,000,000 |  |  |
Senior notes | 2.700% senior notes due 2023 | Third quarter repayments |  |  |  |  |  |  |  |  |  |
Principal payments on long-term debt |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  | $ 484,000,000 |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  | 2.70% |  |  |  |  |  |
Senior notes | 0.00% senior notes due October 2036 |  |  |  |  |  |  |  |  |  |
Principal payments on long-term debt |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  |  | 2,000,000 |  |  |
Senior notes | Zero Coupon senior notes due 2036 |  |  |  |  |  |  |  |  |  |
Principal payments on long-term debt |  |  |  |  |  |  |  |  |  |
Aggregate future principal payments and carrying value |  |  | $ 2,269,000,000 |  |  |  | $ 2,269,000,000 | $ 2,269,000,000 |  |
Debt instrument interest rate stated percentage |  |  | 5.24% |  |  |  |  | 5.24% |  |
Face value |  |  | $ 2,300,000,000 |  |  |  |  | $ 2,300,000,000 |  |
Put in whole, amount |  |  | 1,100,000,000 |  |  |  |  | 1,100,000,000 |  |
Line of credit | Revolving credit racility |  |  |  |  |  |  |  |  |  |
Principal payments on long-term debt |  |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  | 4,000,000,000 |  |  |  |  | $ 4,000,000,000 | $ 5,000,000,000 |
Average annual facility fees |  |  |  |  |  |  |  | 0.302% |  |
Line of credit | Receivables securitization facility |  |  |  |  |  |  |  |  |  |
Principal payments on long-term debt |  |  |  |  |  |  |  |  |  |
Available borrowing capacity |  |  | $ 400,000,000 |  |  |  |  | $ 400,000,000 |  |

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