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DEBT DEBT (Details)
 6 Months Ended
Jun. 30, 2019
USD ($)
Rate
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]    
Total Debt $ 11,147,529,000 $ 9,451,354,000
Unamortized Portion of Terminated Swaps 15,891,000 16,750,000
Unamortized debt issuance costs and discounts (101,683,000) (87,120,000)
Current maturities of long-term debt (307,650,000) (507,650,000)
Long-term debt 10,754,087,000 8,873,334,000
$2.5 Billion Credit Agreement [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 2,500,000,000  
Line of Credit Facility, Amount Outstanding $ 0  
Indebtedness To Adjusted Ebitda Current 3.8  
Indebtedness To Adjusted EBITDA Maximum 5.0  
Indebtedness To Adjusted EBITDA From Acquisitions Maximum 5.5  
Aggregate Purchase Price For Acquisitions Threshold Which Adjusts Allowable Ratio Of Indebtedness To Adjusted EBITDA $ 25,000,000  
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 June 30, 2019. If we consummate one or more acquisitions in which the aggregate purchase is $25 million or more, the allowable ratio of indebtedness to adjusted EBITDA will increase to 5.5 to 1 for the quarter in which the acquisition is completed and the two following quarters. Thereafter, the covenant will decrease to 5.0 to 1. At June 30, 2019, we had no borrowings outstanding, our ratio of indebtedness to adjusted EBITDA was 3.8 to 1, and we were in compliance with all covenants under our $2.5 Billion Credit Agreement.  
Senior Notes [Member]    
Debt Instrument [Line Items]    
Senior Notes, Noncurrent $ 1,250,000,000  
Proceeds from Debt, Net of Issuance Costs 1,230,000,000  
Guardian Pipeline [Member] | Notes Payables 1 due 2022 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 25,132,000 28,957,000
Weighed Average Interest Rate (in hundredths) | Rate 7.85%  
Subsidiary Issuer [Member] | Notes Payables due 2019 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 0 500,000,000
Repayment of Senior Notes $ 500,000,000  
Interest Rate (in hundredths) | Rate 8.625%  
Subsidiary Issuer [Member] | Note Payable from Public Offering Due 2020 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 300,000,000 300,000,000
Interest Rate (in hundredths) | Rate 3.80%  
Subsidiary Issuer [Member] | Note Payable 2 from Public Offering Due 2022 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 900,000,000 900,000,000
Interest Rate (in hundredths) | Rate 3.375%  
Subsidiary Issuer [Member] | Note Payable from Public Offering Due 2023 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 425,000,000 425,000,000
Interest Rate (in hundredths) | Rate 5.00%  
Subsidiary Issuer [Member] | Note Payable from Public Offering Due 2025 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 500,000,000 500,000,000
Interest Rate (in hundredths) | Rate 4.90%  
Subsidiary Issuer [Member] | Notes Payables due 2036 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 600,000,000 600,000,000
Interest Rate (in hundredths) | Rate 6.65%  
Subsidiary Issuer [Member] | Notes Payables due 2037 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 600,000,000 600,000,000
Interest Rate (in hundredths) | Rate 6.85%  
Subsidiary Issuer [Member] | Note Payable from Public Offering Due 2041 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 650,000,000 650,000,000
Interest Rate (in hundredths) | Rate 6.125%  
Subsidiary Issuer [Member] | Note Payable from Public Offering Due 2043 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 400,000,000 400,000,000
Interest Rate (in hundredths) | Rate 6.20%  
Parent Company    
Debt Instrument [Line Items]    
Commercial Paper $ 0 0
Parent Company | Term Loan Agreement due 2021 [Member]    
Debt Instrument [Line Items]    
Total Debt 1,500,000,000 550,000,000
Parent Company | Note Payable from Public Offering Due 2022 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 547,397,000 547,397,000
Interest Rate (in hundredths) | Rate 4.25%  
Parent Company | Note Payable Due 2023 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 500,000,000 500,000,000
Interest Rate (in hundredths) | Rate 7.50%  
Parent Company | Note Payable Due 2027 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 500,000,000 500,000,000
Interest Rate (in hundredths) | Rate 4.00%  
Parent Company | Note Payables 1 due 2028 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 800,000,000 800,000,000
Interest Rate (in hundredths) | Rate 4.55%  
Parent Company | Note Payables 2 due 2028 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 100,000,000 100,000,000
Interest Rate (in hundredths) | Rate 6.875%  
Parent Company | Note Payable from Public Offering Due 2029 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 700,000,000 0
Interest Rate (in hundredths) | Rate 4.35%  
Parent Company | Notes Payables due 2035 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 400,000,000 400,000,000
Interest Rate (in hundredths) | Rate 6.00%  
Parent Company | Notes Payables due 2047 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 700,000,000 700,000,000
Interest Rate (in hundredths) | Rate 4.95%  
Parent Company | Note Payables due 2048 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 1,000,000,000 $ 450,000,000
Interest Rate (in hundredths) | Rate 5.20%  
Parent Company | Note Payables, Additional Issuance, due 2048 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 550,000,000  
London Interbank Offered Rate (LIBOR) [Member] | Parent Company | Term Loan Agreement due 2021 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 1.125%