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DEBT (Details) $ in Thousands	3 Months Ended							12 Months Ended
	Mar. 31, 2023 USD ($) Rate	Dec. 31, 2022 USD ($) Rate	Sep. 30, 2022 USD ($) Rate	Dec. 31, 2021 USD ($) Rate	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($) Rate	Mar. 31, 2020 USD ($) Rate	Dec. 31, 2022 USD ($) Rate	Dec. 31, 2021 USD ($) Rate	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Total debt		$ 13,730,895		$ 13,756,709				$ 13,730,895	$ 13,756,709
Unamortized portion of terminated swaps		9,878		11,596				9,878	11,596
Unamortized debt issuance costs and discounts		(119,939)		(124,855)				(119,939)	(124,855)
Current maturities of long-term debt		(925,000)		(895,814)				(925,000)	(895,814)
Long-term debt		12,695,834		12,747,636				12,695,834	12,747,636
Letters of Credit Outstanding, Amount		7,900		7,700				7,900	7,700
Long-term Debt, Repurchased Face Amount									55,200	$ 224,400
Repayments of Long-term Debt									54,600	199,600
Gain (Loss) on Extinguishment of Debt										$ 22,300
$2.5 Billion Credit Agreement [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		2,500,000						2,500,000
Line of Credit Facility, Amount Outstanding		0		0				0	0
Line of Credit Facility, Sublimit		100,000						100,000
Line of Credit Facility, Swingline Subfacility		200,000						200,000
Line Of Credit Facility, Option To Increase Borrowing Capacity		$ 1,000,000						$ 1,000,000
Line of Credit Facility, Annual Facility Fee Description								the applicable rate is 15 basis points
Line of Credit Facility, Interest Rate Description								Borrowings, if any, will accrue at Term SOFR plus an applicable margin based on our credit ratings at the time of determination plus an adjustment of 10 basis points. Under our current credit ratings, the applicable margin on any borrowings would be 110 basis points.
Indebtedness to Adjusted EBITDA Maximum		5.0						5.0
Indebtedness To Adjusted EBITDA Current		3.7						3.7
Debt Instrument, Covenant Description								Among other things, beginning in June 2022, these covenants include maintaining a ratio of consolidated net indebtedness to adjusted EBITDA (EBITDA, as defined in our $2.5 Billion Credit Agreement, adjusted for all noncash charges and increased for projected EBITDA from certain lender-approved capital expansion projects) of no more than 5.0 to 1 at December 31, 2022.
Guardian Pipeline [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Interest Rate Description								bears interest at Term SOFR plus an applicable margin based on Guardian’s credit rating at the time of determination plus an adjustment of 10 basis points. Under Guardian’s current credit ratings, the applicable margin is 112.5 basis points
Guardian Term Loan Agreement
Debt Instrument [Line Items]
Debt Instrument, Covenant Description								In June 2022, Guardian entered into a $120 million unsecured term loan agreement. The Guardian Term Loan Agreement matures in June 2025, and bears interest at Term SOFR plus an applicable margin based on Guardian’s credit rating at the time of determination plus an adjustment of 10 basis points. Under Guardian’s current credit ratings, the applicable margin is 112.5 basis points. The Guardian Term Loan Agreement allows prepayment of all or any portion outstanding without penalty or premium. During the second quarter 2022, Guardian drew the full $120 million available under the agreement and used the proceeds to repay intercompany debt with ONEOK. As of December 31, 2022, Guardian was in compliance with all covenants under the Guardian Term Loan Agreement.
Notes Payable from Public Offering Due 2026, 2031 and 2051 [Member]
Debt Instrument [Line Items]
Senior Notes, Noncurrent						$ 1,500,000
Proceeds from Debt, Net of Issuance Costs						1,480,000
Notes Payable from Public Offering Due 2025, 2030 and 2050 [Member]
Debt Instrument [Line Items]
Senior Notes, Noncurrent							$ 1,750,000
Proceeds from Debt, Net of Issuance Costs							1,730,000
Notes Payable from Public Offering Due 2032
Debt Instrument [Line Items]
Senior Notes, Noncurrent		$ 750,000						$ 750,000
Proceeds from Debt, Net of Issuance Costs		742,000
Interest Obligations on Debt
Debt Instrument [Line Items]
2023		675,100						675,100
2024		630,400						630,400
2025		599,300						599,300
2026		554,500						554,500
2027		544,700						544,700
Total Aggregate Maturities of Long-term Debt Outstanding and Interest Obligations on Debt
Debt Instrument [Line Items]
2023		1,600,100						1,600,100
2024		1,130,400						1,130,400
2025		1,606,300						1,606,300
2026		1,154,500						1,154,500
2027		1,044,700						1,044,700
Senior Notes [Member]
Debt Instrument [Line Items]
2023		925,000						925,000
2024		500,000						500,000
2025		887,000						887,000
2026		600,000						600,000
2027		500,000						500,000
Guardian Pipeline [Member] | Notes Payables 1 due 2022 [Member]
Debt Instrument [Line Items]
Repayments of Long-term Debt					$ 11,700
Guardian Pipeline [Member] | Notes Payable due 2025 | Variable Rate
Debt Instrument [Line Items]
Total debt		120,000		0				120,000	0
Debt Instrument, Face Amount		120,000						$ 120,000
Debt Instrument, Interest Rate, Basis for Effective Rate | Rate								4.06%
Guardian Pipeline [Member] | Unsecured Debt
Debt Instrument [Line Items]
2023		0						$ 0
2024		0						0
2025		120,000						120,000
2026		0						0
2027		0						0
Subsidiary Issuer [Member] | 3.375% Notes Payable due 2022 [Member]
Debt Instrument [Line Items]
Total debt		0		895,814				0	895,814
Debt Instrument, Face Amount		$ 900,000						$ 900,000
Interest rates (in hundredths) | Rate		3.375%	3.375%					3.375%
Debt Instrument, Redemption Price, Percentage			100.00%
Repayments of Long-term Debt			$ 895,800
Subsidiary Issuer [Member] | 5.0% Notes Payable due 2023 [Member]
Debt Instrument [Line Items]
Total debt		$ 425,000		425,000				$ 425,000	425,000
Debt Instrument, Face Amount		$ 425,000						$ 425,000
Interest rates (in hundredths) | Rate		5.00%						5.00%
Subsidiary Issuer [Member] | 5.0% Notes Payable due 2023 [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Interest rates (in hundredths) | Rate	5.00%
Debt Instrument, Redemption Price, Percentage	100.00%
Repayments of Long-term Debt	$ 425,000
Subsidiary Issuer [Member] | 4.9% Notes Payable due 2025 [Member]
Debt Instrument [Line Items]
Total debt		$ 500,000		500,000				$ 500,000	500,000
Debt Instrument, Face Amount		$ 500,000						$ 500,000
Interest rates (in hundredths) | Rate		4.90%						4.90%
Subsidiary Issuer [Member] | 6.65% Notes Payable due 2036 [Member]
Debt Instrument [Line Items]
Total debt		$ 600,000		600,000				$ 600,000	600,000
Debt Instrument, Face Amount		$ 600,000						$ 600,000
Interest rates (in hundredths) | Rate		6.65%						6.65%
Subsidiary Issuer [Member] | 6.85% Notes Payable due 2037 [Member]
Debt Instrument [Line Items]
Total debt		$ 600,000		600,000				$ 600,000	600,000
Debt Instrument, Face Amount		$ 600,000						$ 600,000
Interest rates (in hundredths) | Rate		6.85%						6.85%
Subsidiary Issuer [Member] | 6.125% Notes Payable due 2041 [Member]
Debt Instrument [Line Items]
Total debt		$ 650,000		650,000				$ 650,000	650,000
Debt Instrument, Face Amount		$ 650,000						$ 650,000
Interest rates (in hundredths) | Rate		6.125%						6.125%
Subsidiary Issuer [Member] | 6.2% Notes Payable due 2043 [Member]
Debt Instrument [Line Items]
Total debt		$ 400,000		400,000				$ 400,000	400,000
Debt Instrument, Face Amount		$ 400,000						$ 400,000
Interest rates (in hundredths) | Rate		6.20%						6.20%
Parent Company
Debt Instrument [Line Items]
Commercial Paper		$ 0		0				$ 0	0
Parent Company | Term Loan Agreement due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount						1,500,000
Repayments of Long-term Debt						1,250,000
Parent Company | 4.25% Notes Payable due 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 700,000					$ 700,000
Interest rates (in hundredths) | Rate				4.25%					4.25%
Repayments of Long-term Debt				$ 536,100
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed				100.00%
Parent Company | 7.5% Notes Payable due 2023 [Member]
Debt Instrument [Line Items]
Total debt		500,000		$ 500,000				500,000	$ 500,000
Debt Instrument, Face Amount		$ 500,000						$ 500,000
Interest rates (in hundredths) | Rate		7.50%						7.50%
Parent Company | 2.75% Notes Payable due 2024 [Member]
Debt Instrument [Line Items]
Total debt		$ 500,000		500,000				$ 500,000	500,000
Debt Instrument, Face Amount		$ 500,000						$ 500,000
Interest rates (in hundredths) | Rate		2.75%						2.75%
Parent Company | 2.2% Notes Payable due 2025 [Member]
Debt Instrument [Line Items]
Total debt		$ 387,000		387,000				$ 387,000	387,000
Debt Instrument, Face Amount		$ 400,000					$ 400,000	$ 400,000
Interest rates (in hundredths) | Rate		2.20%					2.20%	2.20%
Parent Company | 5.85% Notes Payable due 2026 [Member]
Debt Instrument [Line Items]
Total debt		$ 600,000		600,000				$ 600,000	600,000
Debt Instrument, Face Amount		$ 600,000				$ 600,000		$ 600,000
Interest rates (in hundredths) | Rate		5.85%				5.85%		5.85%
Parent Company | 4.0% Notes Payable due 2027 [Member]
Debt Instrument [Line Items]
Total debt		$ 500,000		500,000				$ 500,000	500,000
Debt Instrument, Face Amount		$ 500,000						$ 500,000
Interest rates (in hundredths) | Rate		4.00%						4.00%
Parent Company | 4.55% Notes Payable due 2028 [Member]
Debt Instrument [Line Items]
Total debt		$ 800,000		800,000				$ 800,000	800,000
Debt Instrument, Face Amount		$ 800,000						$ 800,000
Interest rates (in hundredths) | Rate		4.55%						4.55%
Parent Company | 6.875% Notes Payable due 2028 [Member]
Debt Instrument [Line Items]
Total debt		$ 100,000		100,000				$ 100,000	100,000
Debt Instrument, Face Amount		$ 100,000						$ 100,000
Interest rates (in hundredths) | Rate		6.875%						6.875%
Parent Company | 4.35% Notes Payable due 2029 [Member]
Debt Instrument [Line Items]
Total debt		$ 700,000		700,000				$ 700,000	700,000
Debt Instrument, Face Amount		$ 700,000						$ 700,000
Interest rates (in hundredths) | Rate		4.35%						4.35%
Parent Company | 3.4% Notes Payable due 2029 [Member]
Debt Instrument [Line Items]
Total debt		$ 714,251		714,251				$ 714,251	714,251
Debt Instrument, Face Amount		$ 750,000						$ 750,000
Interest rates (in hundredths) | Rate		3.40%						3.40%
Parent Company | 3.1% Notes Payable due 2030 [Member]
Debt Instrument [Line Items]
Total debt		$ 780,093		780,093				$ 780,093	780,093
Debt Instrument, Face Amount		$ 850,000					$ 850,000	$ 850,000
Interest rates (in hundredths) | Rate		3.10%					3.10%	3.10%
Parent Company | 6.35% Notes Payable due 2031 [Member]
Debt Instrument [Line Items]
Total debt		$ 600,000		600,000				$ 600,000	600,000
Debt Instrument, Face Amount		$ 600,000				$ 600,000		$ 600,000
Interest rates (in hundredths) | Rate		6.35%				6.35%		6.35%
Parent Company | 6.1% Notes Payable due 2032
Debt Instrument [Line Items]
Total debt		$ 750,000		0				$ 750,000	0
Debt Instrument, Face Amount		$ 750,000						$ 750,000
Interest rates (in hundredths) | Rate		6.10%						6.10%
Parent Company | 6.0% Notes Payable due 2035 [Member]
Debt Instrument [Line Items]
Total debt		$ 400,000		400,000				$ 400,000	400,000
Debt Instrument, Face Amount		$ 400,000						$ 400,000
Interest rates (in hundredths) | Rate		6.00%						6.00%
Parent Company | 4.95% Notes Payable due 2047 [Member]
Debt Instrument [Line Items]
Total debt		$ 689,006		689,006				$ 689,006	689,006
Debt Instrument, Face Amount		$ 700,000						$ 700,000
Interest rates (in hundredths) | Rate		4.95%						4.95%
Parent Company | 5.2% Notes Payable due 2048 [Member]
Debt Instrument [Line Items]
Total debt		$ 1,000,000		1,000,000				$ 1,000,000	1,000,000
Debt Instrument, Face Amount		$ 1,000,000						$ 1,000,000
Interest rates (in hundredths) | Rate		5.20%						5.20%
Parent Company | 4.45% Notes Payable due 2049 [Member]
Debt Instrument [Line Items]
Total debt		$ 672,530		672,530				$ 672,530	672,530
Debt Instrument, Face Amount		$ 750,000						$ 750,000
Interest rates (in hundredths) | Rate		4.45%						4.45%
Parent Company | 4.5% Notes Payable due 2050 [Member]
Debt Instrument [Line Items]
Total debt		$ 443,015		443,015				$ 443,015	443,015
Debt Instrument, Face Amount		$ 500,000					$ 500,000	$ 500,000
Interest rates (in hundredths) | Rate		4.50%					4.50%	4.50%
Parent Company | 7.15% Notes Payable due 2051 [Member]
Debt Instrument [Line Items]
Total debt		$ 300,000		$ 300,000				$ 300,000	$ 300,000
Debt Instrument, Face Amount		$ 300,000				$ 300,000		$ 300,000
Interest rates (in hundredths) | Rate		7.15%				7.15%		7.15%

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