Revenue from Contracts with Customers - EGTS (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Revenue from External Customer [Line Items]
Operating revenue	$ 6,672	$ 6,366
EGTS
Revenue from External Customer [Line Items]
Total Customer Revenue	283	274
Other revenue	6	1
Operating revenue	289	275
Regulated \| EGTS
Revenue from External Customer [Line Items]
Total Customer Revenue	268	262
Nonregulated \| EGTS
Revenue from External Customer [Line Items]
Total Customer Revenue	15	12
Gas transmission \| Regulated \| EGTS
Revenue from External Customer [Line Items]
Total Customer Revenue	195	190
Gas storage \| Regulated \| EGTS
Revenue from External Customer [Line Items]
Total Customer Revenue	71	71
Wholesale \| Regulated \| EGTS
Revenue from External Customer [Line Items]
Total Customer Revenue	$ 2	$ 1

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No definition available.

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