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DEBT DEBT (Details) $ in Thousands	3 Months Ended				9 Months Ended
	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($) Rate	Jun. 30, 2020 USD ($) Rate	Mar. 31, 2020 USD ($) Rate	Sep. 30, 2020 USD ($) Rate	Dec. 31, 2019 USD ($) Rate
Debt Instrument [Line Items]
Total debt		$ 14,385,638			$ 14,385,638	$ 12,813,704
Unamortized Portion of Terminated Swaps		13,743			13,743	15,032
Unamortized debt issuance costs and discounts		(142,392)			(142,392)	(121,329)
Current maturities of long-term debt		(7,650)			(7,650)	(7,650)
Short-term borrowings		0			0	(220,000)
Long-term debt		14,249,339			14,249,339	12,479,757
Long-term Debt, Repurchased Face Amount		28,000			202,300
Repayments of Debt		25,400			177,700
Gain (loss) on extinguishment of debt		2,200			$ 22,200
Subsequent Event [Member]
Debt Instrument [Line Items]
Business Combination, Consideration Transferred	$ 27,000
$2.5 Billion Credit Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument, Covenant Description					Among other things, these covenants include maintaining a ratio of 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 September 30, 2020. In June 2020, we amended the $2.5 Billion Credit Agreement by, among other things, modifying the leverage ratio so that we may net up to $700 million of cash on hand against our consolidated indebtedness for purposes of calculating the ratio’s numerator for the fiscal quarters ending June 30, 2020, September 30, 2020, and December 31, 2020.
Line of Credit Facility, Amount Outstanding		$ 0			$ 0
Indebtedness To Adjusted Ebitda Current		4.6			4.6
Indebtedness To Adjusted EBITDA Maximum		5.0			5.0
Line of Credit Facility, Maximum Borrowing Capacity		$ 2,500,000			$ 2,500,000
Maximum amount of cash allowable to net against indebtedness for leverage ratio		700,000			700,000
$2.5 Billion Credit Agreement [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Indebtedness To Adjusted EBITDA From Acquisitions Maximum	5.5
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
Guardian Pipeline [Member] | Notes Payables 1 due 2022 [Member]
Debt Instrument [Line Items]
Total debt		$ 15,570			$ 15,570	21,307
Long-term Debt, Weighted Average Interest Rate, at Point in Time | Rate		7.85%			7.85%
Subsidiary Issuer [Member] | 3.375% Notes Payable due 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 900,000			$ 900,000
Total debt		$ 900,000			$ 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]
Debt Instrument, Face Amount		$ 425,000			$ 425,000
Total debt		$ 425,000			$ 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]
Debt Instrument, Face Amount		$ 500,000			$ 500,000
Total debt		$ 500,000			$ 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]
Debt Instrument, Face Amount		$ 600,000			$ 600,000
Total debt		$ 600,000			$ 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]
Debt Instrument, Face Amount		$ 600,000			$ 600,000
Total debt		$ 600,000			$ 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]
Debt Instrument, Face Amount		$ 650,000			$ 650,000
Total debt		$ 650,000			$ 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]
Debt Instrument, Face Amount		$ 400,000			$ 400,000
Total debt		$ 400,000			$ 400,000	$ 400,000
Interest Rate (in hundredths) | Rate		6.20%			6.20%
Parent Company
Debt Instrument [Line Items]
Short-term Debt, Weighted Average Interest Rate, at Point in Time | Rate						2.16%
Commercial paper		$ 0			$ 0	$ 220,000
Parent Company | Term Loan Agreement due 2021 [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate | Rate						2.70%
Debt Instrument, Face Amount		1,500,000	1,500,000		1,500,000
Total debt		0			0	$ 1,250,000
Repayments of 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
Total debt		$ 547,397			$ 547,397	547,397
Interest Rate (in hundredths) | Rate		4.25%			4.25%
Parent Company | 7.5% Notes Payable due 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 500,000			$ 500,000
Total debt		$ 500,000			$ 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]
Debt Instrument, Face Amount		$ 500,000			$ 500,000
Total debt		$ 500,000			$ 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]
Debt Instrument, Face Amount		$ 400,000		$ 400,000	$ 400,000
Total debt		$ 387,000			$ 387,000	0
Interest Rate (in hundredths) | Rate		2.20%		2.20%	2.20%
Parent Company | 5.85% Notes Payable due 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 600,000	$ 600,000		$ 600,000
Total debt		$ 600,000			$ 600,000	0
Interest Rate (in hundredths) | Rate		5.85%	5.85%		5.85%
Parent Company | 4.0% Notes Payable due 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 500,000			$ 500,000
Total debt		$ 500,000			$ 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]
Debt Instrument, Face Amount		$ 800,000			$ 800,000
Total debt		$ 800,000			$ 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]
Debt Instrument, Face Amount		$ 100,000			$ 100,000
Total debt		$ 100,000			$ 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]
Debt Instrument, Face Amount		$ 700,000			$ 700,000
Total debt		$ 700,000			$ 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]
Debt Instrument, Face Amount		$ 750,000			$ 750,000
Total debt		$ 714,251			$ 714,251	750,000
Interest Rate (in hundredths) | Rate		3.40%			3.40%
Parent Company | 3.1% Notes Payable due 2030 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 850,000		$ 850,000	$ 850,000
Total debt		$ 780,093			$ 780,093	0
Interest Rate (in hundredths) | Rate		3.10%		3.10%	3.10%
Parent Company | 6.35% Notes Payable due 2031 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 600,000	$ 600,000		$ 600,000
Total debt		$ 600,000			$ 600,000	0
Interest Rate (in hundredths) | Rate		6.35%	6.35%		6.35%
Parent Company | 6.0% Notes Payable due 2035 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 400,000			$ 400,000
Total debt		$ 400,000			$ 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]
Debt Instrument, Face Amount		$ 700,000			$ 700,000
Total debt		$ 689,006			$ 689,006	700,000
Interest Rate (in hundredths) | Rate		4.95%			4.95%
Parent Company | 5.2% Notes Payable due 2048 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 1,000,000			$ 1,000,000
Total debt		$ 1,000,000			$ 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]
Debt Instrument, Face Amount		$ 750,000			$ 750,000
Total debt		$ 723,736			$ 723,736	750,000
Interest Rate (in hundredths) | Rate		4.45%			4.45%
Parent Company | 4.5% Notes Payable due 2050 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 500,000		$ 500,000	$ 500,000
Total debt		$ 453,585			$ 453,585	0
Interest Rate (in hundredths) | Rate		4.50%		4.50%	4.50%
Parent Company | 7.15% Notes Payable due 2051 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 300,000	$ 300,000		$ 300,000
Total debt		$ 300,000			$ 300,000	$ 0
Interest Rate (in hundredths) | Rate		7.15%	7.15%		7.15%

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