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LONG-TERM DEBT (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 18, 2022 | Aug. 25, 2022 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Unamortized Discount |  |  |  | $ (7,615) | $ (7,636) |
Debt Issuance Costs, Net |  |  |  | (21,092) | (20,143) |
Long-Term Debt and Lease Obligation, Including Current Maturities |  |  |  | 2,960,815 | 2,682,471 |
Long-term Debt, Current Maturities |  |  |  | 772,984 | 12 |
Long-term Debt, excluding current maturities |  |  |  | $ 2,160,401 | 2,661,743 |
Debt Instrument, Redemption Price, Percentage |  |  |  | 100.00% |  |
Debt Instrument, Covenant Compliance, Default Provision, Indebtnedness Threshold |  |  |  | $ 100,000 |  |
Debt Instrument, Covenant Compliance, Default Provision, Debt Holders |  |  |  | 25.00% |  |
Kansas Gas Service Securitization I LLC |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  | $ (5,300) | (5,900) |
3.61% Senior Unsecured Notes Due 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 3.61% |  |
Long-term Debt, Gross |  |  |  | $ 300,000 | 300,000 |
1.10% Senior Unsecured Notes Due 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 1.10% |  | 1.10%
Long-term Debt, Gross |  |  |  | $ 473,000 | 473,000 |
Extinguishment of Debt, Amount | $ 77,000 | $ 150,000 |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 700,000
2.00% Senior Unsecured Notes Due 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 2.00% |  |
Long-term Debt, Gross |  |  |  | $ 300,000 | 300,000 |
5.10% Senior Unsecured Notes Due 2029 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 5.10% |  |
Long-term Debt, Gross |  |  |  | $ 300,000 | 0 |
4.25% Senior Unsecured Notes Due 2032 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 4.25% |  |
Long-term Debt, Gross |  |  |  |  | 300,000 |
Debt Instrument, Face Amount |  |  |  | $ 300,000 |  |
4.658% Senior Unsecured Notes Due 2044 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 4.658% |  |
Long-term Debt, Gross |  |  |  | $ 600,000 | 600,000 |
4.50% Senior Unsecured Notes Due 2048 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 4.50% |  |
Long-term Debt, Gross |  |  |  | $ 400,000 | 400,000 |
Total Senior Unsecured Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | 2,673,000 | 2,373,000 |
5.486% KGSS-I Securitized Utility Tariff Bonds Due 2032 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.486% |  |  |  |  |
Long-term Debt, Gross |  |  |  | 315,284 | 336,000 |
Long-term Debt, Current Maturities |  |  |  | $ 27,430 | 20,716 |
Debt Instrument, Face Amount | $ 336,000 |  |  |  |  |
Weighted Average Life of Securitized Bonds [Domain] | 5 years 6 months |  |  |  |  |
Long-Term Debt, Term | 10 years |  |  |  |  |
8.00% Other Long Term Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 8.00% |  |
Long-term Debt, Gross |  |  |  | $ 1,238 | $ 1,250 |
0.85% Senior Unsecured Notes Due 2023 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 0.85%
Extinguishment of Debt, Amount | $ 250,000 | $ 750,000 |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 1,000,000
Floating rate senior unsecured notes due March 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  | $ 400,000 |  |  |

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