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DEBT DEBT (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
USD ($)
Rate
Dec. 31, 2017
USD ($)
Rate
Debt Instrument [Line Items]    
Total Debt $ 9,023,267 $ 9,198,677
Unamortized Portion of Terminated Swaps 17,179 18,468
Unamortized debt issuance costs and discounts (87,088) (78,193)
Current maturities of long-term debt (507,650) (432,650)
Short-term borrowings (120,000) (614,673)
Long-term debt 8,325,708 8,091,629
$2.5 Billion Credit Agreement [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 2,500,000  
Line of credit facility sublimit 100,000  
Line of Credit Facility Swingline Subfacility 200,000  
Line Of Credit Facility Option To Increase Borrowing Capacity $ 3,500,000  
Line of Credit Facility, Interest Rate Description borrowings, if any, will accrue at LIBOR plus 110 basis points  
Line Of Credit Facility, Annual Facility Fee Description the annual facility fee is 15 basis points  
Indebtedness To Adjusted Ebitda Current 3.5  
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 5.5 to 1 at September 30, 2018. During the third quarter 2018, we acquired the remaining 20 percent interest in WTLPG for $195 million, which increased the covenant to 5.5 to 1 for the third quarter 2018 and the two following quarters. Thereafter, the covenant will decrease to 5.0 to 1. Our $2.5 Billion Credit Agreement includes a $100 million sublimit for the issuance of standby letters of credit and a $200 million sublimit for swingline loans. Under the terms of our $2.5 Billion Credit Agreement, we may request an increase in the size of the facility to an aggregate of $3.5 billion by either commitments from new lenders or increased commitments from existing lenders. Our $2.5 Billion Credit Agreement contains provisions for an applicable margin rate and an annual facility fee, both of which adjust with changes in our credit ratings. Based on our current credit ratings, borrowings, if any, will accrue at LIBOR plus 110 basis points, and the annual facility fee is 15 basis points. We have the option to request an additional one year extension, subject to lender approval, which may be used for working capital, capital expenditures, acquisitions and mergers, the issuance of letters of credit and for other general corporate purposes. At September 30, 2018, we had no borrowings outstanding, our ratio of indebtedness to adjusted EBITDA was 3.5 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  
Proceeds from Debt, Net of Issuance Costs 1,230,000  
Guardian Pipeline [Member] | Notes Payables 1 due 2022 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 30,870 36,607
Weighed Average Interest Rate (in hundredths) | Rate 7.85%  
Subsidiary Issuer [Member] | Note Payable from Public Offering Due 2018 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 0 425,000
Repayment of Senior Notes $ 425,000  
Interest Rate (in hundredths) | Rate 3.20%  
Subsidiary Issuer [Member] | Term Loan Agreement [Member]    
Debt Instrument [Line Items]    
Total Debt $ 0 $ 500,000
Repayment of Senior Notes 500,000  
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate | Rate   2.87%
Subsidiary Issuer [Member] | Notes Payables due 2019 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 500,000 $ 500,000
Interest Rate (in hundredths) | Rate 8.625%  
Subsidiary Issuer [Member] | Note Payable from Public Offering Due 2020 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 300,000 300,000
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 $ 900,000 900,000
Interest Rate (in hundredths) | Rate 3.375%  
Subsidiary Issuer [Member] | Note Payable from Public Offering Due 2023 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 425,000 425,000
Interest Rate (in hundredths) | Rate 5.00%  
Subsidiary Issuer [Member] | Note Payable from Public Offering Due 2025 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 500,000 500,000
Interest Rate (in hundredths) | Rate 4.90%  
Subsidiary Issuer [Member] | Notes Payables due 2036 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 600,000 600,000
Interest Rate (in hundredths) | Rate 6.65%  
Subsidiary Issuer [Member] | Notes Payables due 2037 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 600,000 600,000
Interest Rate (in hundredths) | Rate 6.85%  
Subsidiary Issuer [Member] | Note Payable from Public Offering Due 2041 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 650,000 650,000
Interest Rate (in hundredths) | Rate 6.125%  
Subsidiary Issuer [Member] | Note Payable from Public Offering Due 2043 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 400,000 400,000
Interest Rate (in hundredths) | Rate 6.20%  
Parent Company    
Debt Instrument [Line Items]    
Commercial Paper $ 120,000 $ 614,673
Short-term Debt, Weighted Average Interest Rate, at Point in Time | Rate 2.85% 2.23%
Parent Company | Note Payable from Public Offering Due 2028 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 800,000  
Interest Rate (in hundredths) | Rate 4.55%  
Parent Company | Note Payable from Public Offering Due 2048 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 450,000  
Interest Rate (in hundredths) | Rate 5.20%  
Parent Company | Note Payable from Public Offering Due 2022 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 547,397 $ 547,397
Interest Rate (in hundredths) | Rate 4.25%  
Parent Company | Note Payable Due 2023 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 500,000 500,000
Interest Rate (in hundredths) | Rate 7.50%  
Parent Company | Note Payable Due 2027 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 500,000 500,000
Interest Rate (in hundredths) | Rate 4.00%  
Parent Company | Note Payables 1 due 2028 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 800,000 0
Interest Rate (in hundredths) | Rate 4.55%  
Parent Company | Note Payables 2 due 2028 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 100,000 100,000
Interest Rate (in hundredths) | Rate 6.875%  
Parent Company | Notes Payables due 2035 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 400,000 400,000
Interest Rate (in hundredths) | Rate 6.00%  
Parent Company | Notes Payables due 2047 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 700,000 700,000
Interest Rate (in hundredths) | Rate 4.95%  
Parent Company | Note Payables due 2048 [Member]    
Debt Instrument [Line Items]    
Total Debt $ 450,000 $ 0
Interest Rate (in hundredths) | Rate 5.20%