Revenue from Contracts with Customers - EGTS (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Operating revenue	$ 6,686	$ 6,394	$ 13,358	$ 12,760
EGTS
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total Customer Revenue	243	229	526	503
Other revenue	3	0	9	1
Operating revenue	246	229	535	504
Regulated \| EGTS
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total Customer Revenue	226	217	494	479
Nonregulated \| EGTS
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total Customer Revenue	17	12	32	24
Gas transmission \| Regulated \| EGTS
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total Customer Revenue	155	146	350	336
Gas storage \| Regulated \| EGTS
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total Customer Revenue	71	71	142	142
Wholesale \| Regulated \| EGTS
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total Customer Revenue	$ 0	$ 0	$ 2	$ 1

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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