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Segment Disclosures Recon from Segment to Consolidated - Assets and Investments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Segment Reporting, Asset Reconciling Item [Line Items]          
Total assets $ 55,736   $ 55,736   $ 54,532
Current assets 2,271   2,271   2,661
Other Assets, Noncurrent 1,888   1,888   1,830
Operating Segments [Member] | Transmission, Power & Gulf [Member]          
Segment Reporting, Asset Reconciling Item [Line Items]          
Payments to Acquire Productive Assets 754 $ 761 1,781 $ 3,763  
Equity-method investments 262   262   272
Total assets 24,329   24,329   23,149
Operating Segments [Member] | Northeast G & P [Member]          
Segment Reporting, Asset Reconciling Item [Line Items]          
Payments to Acquire Productive Assets 53 56 166 163  
Equity-method investments 3,255   3,255   3,346
Total assets 12,631   12,631   12,918
Operating Segments [Member] | West [Member]          
Segment Reporting, Asset Reconciling Item [Line Items]          
Payments to Acquire Productive Assets 167 126 962 288  
Equity-method investments 460   460   476
Total assets 12,735   12,735   12,144
Operating Segments [Member] | Gas & NGL Marketing Services          
Segment Reporting, Asset Reconciling Item [Line Items]          
Payments to Acquire Productive Assets 0 1 1 1  
Equity-method investments 153   153   0
Total assets 183   183   46
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment          
Segment Reporting, Asset Reconciling Item [Line Items]          
Payments to Acquire Productive Assets 974 $ 944 2,910 $ 4,215  
Equity-method investments 4,130   4,130   4,094
Total assets $ 49,878   $ 49,878   $ 48,257