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DEBT DEBT (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Nov. 01, 2021
USD ($)
Rate
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Rate
Oct. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Rate
Debt Instrument [Line Items]            
Total debt       $ 14,292,816   $ 14,361,644
Unamortized portion of terminated swaps       12,025   13,314
Unamortized debt issuance costs and discounts       (128,267)   (138,887)
Current maturities of long-term debt       (536,107)   (7,650)
Long-term debt       13,640,467   14,228,421
Long-term Debt, Repurchased Face Amount     $ 55,200      
Repayments of Debt     $ 54,600      
$2.5 Billion Credit Agreement [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity       2,500,000    
Line of Credit Facility, Amount Outstanding       $ 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) of no more than 5.0 to 1 at September 30, 2021.    
Indebtedness To Adjusted EBITDA Maximum       5.0    
Indebtedness To Adjusted EBITDA Current       4.3    
Guardian Pipeline [Member] | Notes Payables due 2022 [Member]            
Debt Instrument [Line Items]            
Total debt       $ 0   $ 13,657
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
Debt Instrument, Face Amount       $ 900,000    
Interest Rate (in hundredths) | Rate       3.375%    
Subsidiary Issuer [Member] | 5.0% Notes Payable due 2023 [Member]            
Debt Instrument [Line Items]            
Total debt       $ 425,000   425,000
Debt Instrument, Face Amount       $ 425,000    
Interest Rate (in hundredths) | Rate       5.00%    
Subsidiary Issuer [Member] | 4.9% Notes Payable due 2025 [Member]            
Debt Instrument [Line Items]            
Total debt       $ 500,000   500,000
Debt Instrument, Face Amount       $ 500,000    
Interest Rate (in hundredths) | Rate       4.90%    
Subsidiary Issuer [Member] | 6.65% Notes Payable due 2036 [Member]            
Debt Instrument [Line Items]            
Total debt       $ 600,000   600,000
Debt Instrument, Face Amount       $ 600,000    
Interest Rate (in hundredths) | Rate       6.65%    
Subsidiary Issuer [Member] | 6.85% Notes Payable due 2037 [Member]            
Debt Instrument [Line Items]            
Total debt       $ 600,000   600,000
Debt Instrument, Face Amount       $ 600,000    
Interest Rate (in hundredths) | Rate       6.85%    
Subsidiary Issuer [Member] | 6.125% Notes Payable due 2041 [Member]            
Debt Instrument [Line Items]            
Total debt       $ 650,000   650,000
Debt Instrument, Face Amount       $ 650,000    
Interest Rate (in hundredths) | Rate       6.125%    
Subsidiary Issuer [Member] | 6.2% Notes Payable due 2043 [Member]            
Debt Instrument [Line Items]            
Total debt       $ 400,000   400,000
Debt Instrument, Face Amount       $ 400,000    
Interest Rate (in hundredths) | Rate       6.20%    
Parent Company            
Debt Instrument [Line Items]            
Commercial paper       $ 0   0
Parent Company | Subsequent Event [Member]            
Debt Instrument [Line Items]            
Commercial paper         $ 150,000  
Parent Company | 4.25% Notes Payable due 2022 [Member]            
Debt Instrument [Line Items]            
Total debt       536,107   541,877
Debt Instrument, Face Amount       $ 700,000    
Interest Rate (in hundredths) | Rate       4.25%    
Parent Company | 4.25% Notes Payable due 2022 [Member] | Subsequent Event [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount $ 700,000          
Interest Rate (in hundredths) | Rate 4.25%          
Repayments of 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
Debt Instrument, Face Amount       $ 500,000    
Interest Rate (in hundredths) | Rate       7.50%    
Parent Company | 2.75% Notes Payable due 2024 [Member]            
Debt Instrument [Line Items]            
Total debt       $ 500,000   500,000
Debt Instrument, Face Amount       $ 500,000    
Interest Rate (in hundredths) | Rate       2.75%    
Parent Company | 2.2% Notes Payable due 2025 [Member]            
Debt Instrument [Line Items]            
Total debt       $ 387,000   387,000
Debt Instrument, Face Amount       $ 400,000    
Interest Rate (in hundredths) | Rate       2.20%    
Parent Company | 5.85% Notes Payable due 2026 [Member]            
Debt Instrument [Line Items]            
Total debt       $ 600,000   600,000
Debt Instrument, Face Amount       $ 600,000    
Interest Rate (in hundredths) | Rate       5.85%    
Parent Company | 4.0% Notes Payable due 2027 [Member]            
Debt Instrument [Line Items]            
Total debt       $ 500,000   500,000
Debt Instrument, Face Amount       $ 500,000    
Interest Rate (in hundredths) | Rate       4.00%    
Parent Company | 4.55% Notes Payable due 2028 [Member]            
Debt Instrument [Line Items]            
Total debt       $ 800,000   800,000
Debt Instrument, Face Amount       $ 800,000    
Interest Rate (in hundredths) | Rate       4.55%    
Parent Company | 6.875% Notes Payable due 2028 [Member]            
Debt Instrument [Line Items]            
Total debt       $ 100,000   100,000
Debt Instrument, Face Amount       $ 100,000    
Interest Rate (in hundredths) | Rate       6.875%    
Parent Company | 4.35% Notes Payable due 2029 [Member]            
Debt Instrument [Line Items]            
Total debt       $ 700,000   700,000
Debt Instrument, Face Amount       $ 700,000    
Interest Rate (in hundredths) | Rate       4.35%    
Parent Company | 3.4% Notes Payable due 2029 [Member]            
Debt Instrument [Line Items]            
Total debt       $ 714,251   714,251
Debt Instrument, Face Amount       $ 750,000    
Interest Rate (in hundredths) | Rate       3.40%    
Parent Company | 3.1% Notes Payable due 2030 [Member]            
Debt Instrument [Line Items]            
Total debt       $ 780,093   780,093
Debt Instrument, Face Amount       $ 850,000    
Interest Rate (in hundredths) | Rate       3.10%    
Parent Company | 6.35% Notes Payable due 2031 [Member]            
Debt Instrument [Line Items]            
Total debt       $ 600,000   600,000
Debt Instrument, Face Amount       $ 600,000    
Interest Rate (in hundredths) | Rate       6.35%    
Parent Company | 6.0% Notes Payable due 2035 [Member]            
Debt Instrument [Line Items]            
Total debt       $ 400,000   400,000
Debt Instrument, Face Amount       $ 400,000    
Interest Rate (in hundredths) | Rate       6.00%    
Parent Company | 4.95% Notes Payable due 2047 [Member]            
Debt Instrument [Line Items]            
Total debt       $ 689,006   689,006
Debt Instrument, Face Amount       $ 700,000    
Interest Rate (in hundredths) | Rate       4.95%    
Parent Company | 5.2% Notes Payable due 2048 [Member]            
Debt Instrument [Line Items]            
Total debt       $ 1,000,000   1,000,000
Debt Instrument, Face Amount       $ 1,000,000    
Interest Rate (in hundredths) | Rate       5.20%    
Parent Company | 4.45% Notes Payable due 2049 [Member]            
Debt Instrument [Line Items]            
Total debt       $ 672,530   713,676
Debt Instrument, Face Amount       $ 750,000    
Interest Rate (in hundredths) | Rate       4.45%    
Parent Company | 4.5% Notes Payable due 2050 [Member]            
Debt Instrument [Line Items]            
Total debt       $ 443,015   451,270
Debt Instrument, Face Amount       $ 500,000    
Interest Rate (in hundredths) | Rate       4.50%    
Parent Company | 7.15% Notes Payable due 2051 [Member]            
Debt Instrument [Line Items]            
Total debt       $ 300,000   $ 300,000
Debt Instrument, Face Amount       $ 300,000    
Interest Rate (in hundredths) | Rate       7.15%