Regulatory Matters - 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
Cost of removal
Regulatory Liabilities [Line Items]
Regulatory liability, amortization period	27 years
Total regulatory liabilities	$ 2,578	2,424
Revenue sharing mechanisms
Regulatory Liabilities [Line Items]
Regulatory liability, amortization period	2 years
Total regulatory liabilities	$ 426	188
Unrealized gains on regulated derivative contracts
Regulatory Liabilities [Line Items]
Regulatory liability, amortization period	1 year
Total regulatory liabilities	$ 343	86
Asset retirement obligations
Regulatory Liabilities [Line Items]
Regulatory liability, amortization period	31 years
Total regulatory liabilities	$ 250	345
Levelized depreciation
Regulatory Liabilities [Line Items]
Regulatory liability, amortization period	28 years
Total regulatory liabilities	$ 245	259
Employee benefit plans
Regulatory Liabilities [Line Items]
Total regulatory liabilities	180	243
Other
Regulatory Liabilities [Line Items]
Total regulatory liabilities	$ 446	$ 484