0000001 - Document - Cover Page link:presentationLink link:calculationLink link:definitionLink 9952151 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) link:presentationLink link:calculationLink link:definitionLink 9952152 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) link:presentationLink link:calculationLink link:definitionLink 9952153 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952154 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) link:presentationLink link:calculationLink link:definitionLink 9952155 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS link:presentationLink link:calculationLink link:definitionLink 9952156 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952157 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMMON STOCK EQUITY (Unaudited) link:presentationLink link:calculationLink link:definitionLink 9952158 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMMON STOCK EQUITY (Unaudited) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952159 - Disclosure - NATURE OF THE BUSINESS link:presentationLink link:calculationLink link:definitionLink 9952160 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES link:presentationLink link:calculationLink link:definitionLink 9952161 - Disclosure - REVENUE link:presentationLink link:calculationLink link:definitionLink 9952162 - Disclosure - REGULATION link:presentationLink link:calculationLink link:definitionLink 9952163 - Disclosure - DERIVATIVE INSTRUMENTS link:presentationLink link:calculationLink link:definitionLink 9952164 - Disclosure - FAIR VALUE link:presentationLink link:calculationLink link:definitionLink 9952165 - Disclosure - INVESTMENTS IN EQUITY INVESTEES link:presentationLink link:calculationLink link:definitionLink 9952166 - Disclosure - EARNINGS PER SHARE link:presentationLink link:calculationLink link:definitionLink 9952167 - Disclosure - DEBT link:presentationLink link:calculationLink link:definitionLink 9952168 - Disclosure - EMPLOYEE BENEFIT PLANS link:presentationLink link:calculationLink link:definitionLink 9952169 - Disclosure - INCOME TAXES link:presentationLink link:calculationLink link:definitionLink 9952170 - Disclosure - LEASES link:presentationLink link:calculationLink link:definitionLink 9952171 - Disclosure - COMMITMENTS AND CONTINGENT LIABILITIES link:presentationLink link:calculationLink link:definitionLink 9952172 - Disclosure - REPORTABLE SEGMENT DATA link:presentationLink link:calculationLink link:definitionLink 9952173 - Disclosure - RELATED PARTY TRANSACTIONS link:presentationLink link:calculationLink link:definitionLink 9952174 - Disclosure - DISPOSITIONS link:presentationLink link:calculationLink link:definitionLink 9955511 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) link:presentationLink link:calculationLink link:definitionLink 9955512 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) link:presentationLink link:calculationLink link:definitionLink 9955513 - Disclosure - REVENUE (Tables) link:presentationLink link:calculationLink link:definitionLink 9955514 - Disclosure - REGULATION (Tables) link:presentationLink link:calculationLink link:definitionLink 9955515 - Disclosure - DERIVATIVE INSTRUMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 9955516 - Disclosure - FAIR VALUE (Tables) link:presentationLink link:calculationLink link:definitionLink 9955517 - Disclosure - EARNINGS PER SHARE (Tables) link:presentationLink link:calculationLink link:definitionLink 9955518 - Disclosure - DEBT (Tables) link:presentationLink link:calculationLink link:definitionLink 9955519 - Disclosure - EMPLOYEE BENEFIT PLANS (Tables) link:presentationLink link:calculationLink link:definitionLink 9955520 - Disclosure - LEASES (Tables) link:presentationLink link:calculationLink link:definitionLink 9955521 - Disclosure - COMMITMENTS AND CONTINGENT LIABILITIES (Tables) link:presentationLink link:calculationLink link:definitionLink 9955522 - Disclosure - REPORTABLE SEGMENT DATA (Tables) link:presentationLink link:calculationLink link:definitionLink 9955523 - Disclosure - RELATED PARTY TRANSACTIONS (Tables) link:presentationLink link:calculationLink link:definitionLink 9955524 - Disclosure - NATURE OF THE BUSINESS (Details) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ADDITIONAL INFORMATION (Details) link:presentationLink link:calculationLink link:definitionLink 9955526 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - CASH, CASH EQUIVALENTS AND RESTRICTED CASH (Details) link:presentationLink link:calculationLink link:definitionLink 9955527 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - NATURAL GAS IN STORAGE (Details) link:presentationLink link:calculationLink link:definitionLink 9955528 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - SOFTWARE COSTS (Details) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) link:presentationLink link:calculationLink link:definitionLink 9955530 - Disclosure - REVENUE - DISAGGREGATED REVENUE - PRODUCT (Details) link:presentationLink link:calculationLink link:definitionLink 9955531 - Disclosure - REVENUE - DISAGGREGATED REVENUE - TYPE (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - REVENUE - TIMING OF REVENUE RECOGNITION (Details) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - REVENUE - TIMING OF REVENUE RECOGNITION - BALANCE SHEET (Details) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - REGULATION - ADDITIONAL INFORMATION (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - REGULATION - REGULATORY ASSETS AND LIABILITIES (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - DERIVATIVE INSTRUMENTS - BALANCE SHEET RELATED DISCLOSURES (Details) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - DERIVATIVE INSTRUMENTS - OFFSETTING OF ASSETS AND LIABILITIES (Details) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - DERIVATIVE INSTRUMENTS - INCOME STATEMENT RELATED DISCLOSURES (Details) link:presentationLink link:calculationLink link:definitionLink 9955539 - Disclosure - DERIVATIVE INSTRUMENTS - VOLUME (Details) link:presentationLink link:calculationLink link:definitionLink 9955540 - Disclosure - DERIVATIVE INSTRUMENTS - ADDITIONAL INFORMATION (Details) link:presentationLink link:calculationLink link:definitionLink 9955541 - Disclosure - DERIVATIVE INSTRUMENTS - BROKER MARGIN DEPOSITS (Details) link:presentationLink link:calculationLink link:definitionLink 9955542 - Disclosure - DERIVATIVE INSTRUMENTS - CREDIT RISK EXPOSURE (Details) link:presentationLink link:calculationLink link:definitionLink 9955543 - Disclosure - FAIR VALUE - DEBT (Details) link:presentationLink link:calculationLink link:definitionLink 9955544 - Disclosure - FAIR VALUE - ADDITIONAL INFORMATION (Details) link:presentationLink link:calculationLink link:definitionLink 9955545 - Disclosure - FAIR VALUE - HIERARCHY (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - INVESTMENTS IN EQUITY INVESTEES (Details) link:presentationLink link:calculationLink link:definitionLink 9955547 - Disclosure - EARNINGS PER SHARE (Details) link:presentationLink link:calculationLink link:definitionLink 9955548 - Disclosure - DEBT - CREDIT FACILITIES AND SHORT-TERM DEBT (Details) link:presentationLink link:calculationLink link:definitionLink 9955549 - Disclosure - DEBT - LONG TERM DEBT (Details) link:presentationLink link:calculationLink link:definitionLink 9955550 - Disclosure - EMPLOYEE BENEFIT PLANS - ADDITIONAL INFORMATION (Details) link:presentationLink link:calculationLink link:definitionLink 9955551 - Disclosure - EMPLOYEE BENEFIT PLANS - COMPONENTS OF NET PERIODIC COST (Details) link:presentationLink link:calculationLink link:definitionLink 9955552 - Disclosure - INCOME TAXES (Details) link:presentationLink link:calculationLink link:definitionLink 9955553 - Disclosure - LEASES - ADDITIONAL INFORMATION (Details) link:presentationLink link:calculationLink link:definitionLink 9955554 - Disclosure - LEASES - LEASE COST (Details) link:presentationLink link:calculationLink link:definitionLink 9955555 - Disclosure - LEASES - SUPPLEMENTAL CASH FLOW INFORMATION (Details) link:presentationLink link:calculationLink link:definitionLink 9955556 - Disclosure - LEASES - RIGHT-OF-USE ASSETS AND LEASE LIABILITIES (Details) link:presentationLink link:calculationLink link:definitionLink 9955557 - Disclosure - COMMITMENTS AND CONTINGENT LIABILITIES - FUTURE COMMITTED EXPENSES (Details) link:presentationLink link:calculationLink link:definitionLink 9955558 - Disclosure - COMMITMENTS AND CONTINGENT LIABILITIES - GUARANTEES (Details) link:presentationLink link:calculationLink link:definitionLink 9955559 - Disclosure - COMMITMENTS AND CONTINGENT LIABILITIES - LEGAL PROCEEDINGS (Details) link:presentationLink link:calculationLink link:definitionLink 9955560 - Disclosure - REPORTABLE SEGMENT DATA - ADDITIONAL INFORMATION (Details) link:presentationLink link:calculationLink link:definitionLink 9955561 - Disclosure - REPORTABLE SEGMENT DATA - RECONCILIATION OF SEGMENT INCOME TO CONSOLIDATED (Details) link:presentationLink link:calculationLink link:definitionLink 9955562 - Disclosure - REPORTABLE SEGMENT DATA - RECONCILIATION OF CAPITAL EXPENDITURES AND SEGMENT ASSETS TO CONSOLIDATED (Details) link:presentationLink link:calculationLink link:definitionLink 9955563 - Disclosure - RELATED PARTY TRANSACTIONS - ADDITIONAL INFORMATION (Details) link:presentationLink link:calculationLink link:definitionLink 9955564 - Disclosure - RELATED PARTY TRANSACTIONS - DEMAND FEES (Details) link:presentationLink link:calculationLink link:definitionLink 9955565 - Disclosure - DISPOSITIONS (Details) link:presentationLink link:calculationLink link:definitionLink