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DEBT DEBT (Details) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2021 USD ($) Rate	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) Rate	Jun. 30, 2021 USD ($) Rate
Debt Instrument [Line Items]
Total debt	$ 14,292,816		$ 14,361,644	$ 14,292,816
Unamortized portion of terminated swaps	12,455		13,314	12,455
Unamortized debt issuance costs and discounts	(131,583)		(138,887)	(131,583)
Current maturities of long-term debt	(536,107)		(7,650)	(536,107)
Long-term debt	13,637,581		14,228,421	13,637,581
Long-term Debt, Repurchased Face Amount		$ 55,200
Repayments of Debt		$ 54,600
Business Combination, Consideration Transferred			27,000
$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
Debt Instrument, Covenant Description				Among other things, these covenants include maintaining a ratio of 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). In 2020, we acquired additional interest in one of our equity investments and a related asset for $27 million, which allowed us to elect an acquisition adjustment period under our $2.5 Billion Credit Agreement and, as a result, increased our leverage ratio covenant to 5.5 to 1 for the fourth quarter 2020 and the two following quarters. Beginning in the third quarter 2021, the covenant decreased to 5.0 to 1.
Indebtedness To Adjusted EBITDA From Acquisitions Maximum	5.5			5.5
Indebtedness To Adjusted EBITDA Maximum	5.0			5.0
Indebtedness To Adjusted EBITDA Current	4.4			4.4
Guardian Pipeline [Member] | Notes Payables due 2022 [Member]
Debt Instrument [Line Items]
Total debt	$ 0		$ 13,657	$ 0
Average interest rate (in hundredths) | Rate			7.85%
Repayments of Debt	11,700
Subsidiary Issuer [Member] | 3.375% Notes Payable due 2022 [Member]
Debt Instrument [Line Items]
Total debt	895,814		$ 895,814	895,814
Debt Instrument, Face Amount	$ 900,000			$ 900,000
Interest Rate (in hundredths) | Rate	3.375%			3.375%
Subsidiary Issuer [Member] | 5.0% Notes Payable due 2023 [Member]
Debt Instrument [Line Items]
Total debt	$ 425,000		425,000	$ 425,000
Debt Instrument, Face Amount	$ 425,000			$ 425,000
Interest Rate (in hundredths) | Rate	5.00%			5.00%
Subsidiary Issuer [Member] | 4.9% Notes Payable due 2025 [Member]
Debt Instrument [Line Items]
Total debt	$ 500,000		500,000	$ 500,000
Debt Instrument, Face Amount	$ 500,000			$ 500,000
Interest Rate (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
Debt Instrument, Face Amount	$ 600,000			$ 600,000
Interest Rate (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
Debt Instrument, Face Amount	$ 600,000			$ 600,000
Interest Rate (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
Debt Instrument, Face Amount	$ 650,000			$ 650,000
Interest Rate (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
Debt Instrument, Face Amount	$ 400,000			$ 400,000
Interest Rate (in hundredths) | Rate	6.20%			6.20%
Parent Company
Debt Instrument [Line Items]
Commercial paper	$ 0		0	$ 0
Parent Company | 4.25% Notes Payable due 2022 [Member]
Debt Instrument [Line Items]
Total debt	536,107		541,877	536,107
Debt Instrument, Face Amount	$ 700,000			$ 700,000
Interest Rate (in hundredths) | Rate	4.25%			4.25%
Parent Company | 7.5% Notes Payable due 2023 [Member]
Debt Instrument [Line Items]
Total debt	$ 500,000		500,000	$ 500,000
Debt Instrument, Face Amount	$ 500,000			$ 500,000
Interest Rate (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
Debt Instrument, Face Amount	$ 500,000			$ 500,000
Interest Rate (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
Debt Instrument, Face Amount	$ 400,000			$ 400,000
Interest Rate (in hundredths) | Rate	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
Debt Instrument, Face Amount	$ 600,000			$ 600,000
Interest Rate (in hundredths) | Rate	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
Debt Instrument, Face Amount	$ 500,000			$ 500,000
Interest Rate (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
Debt Instrument, Face Amount	$ 800,000			$ 800,000
Interest Rate (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
Debt Instrument, Face Amount	$ 100,000			$ 100,000
Interest Rate (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
Debt Instrument, Face Amount	$ 700,000			$ 700,000
Interest Rate (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
Debt Instrument, Face Amount	$ 750,000			$ 750,000
Interest Rate (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
Debt Instrument, Face Amount	$ 850,000			$ 850,000
Interest Rate (in hundredths) | Rate	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
Debt Instrument, Face Amount	$ 600,000			$ 600,000
Interest Rate (in hundredths) | Rate	6.35%			6.35%
Parent Company | 6.0% Notes Payable due 2035 [Member]
Debt Instrument [Line Items]
Total debt	$ 400,000		400,000	$ 400,000
Debt Instrument, Face Amount	$ 400,000			$ 400,000
Interest Rate (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
Debt Instrument, Face Amount	$ 700,000			$ 700,000
Interest Rate (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
Debt Instrument, Face Amount	$ 1,000,000			$ 1,000,000
Interest Rate (in hundredths) | Rate	5.20%			5.20%
Parent Company | 4.45% Notes Payable due 2049 [Member]
Debt Instrument [Line Items]
Total debt	$ 672,530		713,676	$ 672,530
Debt Instrument, Face Amount	$ 750,000			$ 750,000
Interest Rate (in hundredths) | Rate	4.45%			4.45%
Parent Company | 4.5% Notes Payable due 2050 [Member]
Debt Instrument [Line Items]
Total debt	$ 443,015		451,270	$ 443,015
Debt Instrument, Face Amount	$ 500,000			$ 500,000
Interest Rate (in hundredths) | Rate	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
Debt Instrument, Face Amount	$ 300,000			$ 300,000
Interest Rate (in hundredths) | Rate	7.15%			7.15%

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