Regulatory Matters - EGTS - Regulatory Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Regulatory Liabilities [Line Items]
Total regulatory liabilities	$ 7,369	$ 7,214
Regulatory liabilities, current	299	254
Regulatory liabilities, noncurrent	7,070	6,960
Deferred income taxes
Regulatory Liabilities [Line Items]
Total regulatory liabilities	2,901	3,185
Other postretirement benefit costs
Regulatory Liabilities [Line Items]
Total regulatory liabilities	$ 180	243
Cost of removal
Regulatory Liabilities [Line Items]
Regulatory liability, amortization period	27 years
Total regulatory liabilities	$ 2,578	2,424
EGTS
Regulatory Liabilities [Line Items]
Total regulatory liabilities	627	532
Regulatory liabilities, current	109	25
Regulatory liabilities, noncurrent	518	507
EGTS | Deferred income taxes
Regulatory Liabilities [Line Items]
Total regulatory liabilities	382	391
EGTS | Other postretirement benefit costs
Regulatory Liabilities [Line Items]
Total regulatory liabilities	123	116
EGTS | Provision for rate refunds
Regulatory Liabilities [Line Items]
Total regulatory liabilities	$ 90	0
EGTS | Cost of removal
Regulatory Liabilities [Line Items]
Regulatory liability, amortization period	53 years
Total regulatory liabilities	$ 24	16
Regulatory liabilities, noncurrent	24	16
EGTS | Other
Regulatory Liabilities [Line Items]
Total regulatory liabilities	$ 8	$ 9