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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Sep. 25, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Cash flow hedge, cumulative gain (loss)     $ 31,000,000 $ (58,000,000)    
Change in fair value of derivatives, net of tax of $(46), $(28) and $61, respectively     155,000,000 93,000,000 $ (204,000,000)  
Gain (loss) on AOCI, cash flow hedges     66,000,000 $ (201,000,000) $ (229,000,000)  
Derivative, net liability position, aggregate fair value     0      
Senior Notes | Magellan Acquisition            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Debt instrument, face amount           $ 5,250,000,000
Commodity Contract            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Cash flow hedge, cumulative gain (loss)     63,000,000      
Treasury Lock            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Change in fair value of derivatives, net of tax of $(46), $(28) and $61, respectively $ 43,000,000          
Treasury Lock | Cash Flow Hedging            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Derivative, notional amount settled $ 1,100,000,000          
Forward contracts            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Change in fair value of derivatives, net of tax of $(46), $(28) and $61, respectively     44,000,000      
Forward contracts | Interest-rate contracts | Cash Flow Hedging            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Derivative, notional amount settled     $ 400,000,000      
Forward contracts | Treasury Lock | Cash Flow Hedging | Forecasted Debt Issuances            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Derivative notional amount, new contracts   $ 1,100,000,000