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ACCUMULATED OTHER COMPREHENSIVE LOSS - Accumulated Other Comprehensive Income, Before and After Reclassification (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2023
USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Total equity, beginning balance $ 6,494
Other comprehensive income before reclassifications 86
Amounts reclassified to net income (46)
Other comprehensive income (loss) 40
Total equity, ending balance 16,299
Risk- Management Assets/Liabilities  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Total equity, beginning balance (58)
Other comprehensive income before reclassifications 86
Amounts reclassified to net income (44)
Other comprehensive income (loss) 42
Total equity, ending balance (16)
Retirement and Other Postretirement Benefit Plan Obligations (a)  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Total equity, beginning balance (55)
Other comprehensive income before reclassifications 0
Amounts reclassified to net income 3
Other comprehensive income (loss) 3
Total equity, ending balance (52)
Risk- Management Assets/Liabilities of Unconsolidated Affiliates  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Total equity, beginning balance 5
Other comprehensive income before reclassifications 0
Amounts reclassified to net income (5)
Other comprehensive income (loss) (5)
Total equity, ending balance 0
Accumulated Other Comprehensive Loss  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Total equity, beginning balance (108)
Total equity, ending balance $ (68)