Regulatory Matters - PAC - 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
Cost of removal
Regulatory Liabilities [Line Items]
Regulatory liability, amortization period	27 years
Total regulatory liabilities	$ 2,578	2,424
Deferred income taxes
Regulatory Liabilities [Line Items]
Total regulatory liabilities	2,901	3,185
PAC
Regulatory Liabilities [Line Items]
Total regulatory liabilities	2,939	2,768
Regulatory liabilities, current	96	118
Regulatory liabilities, noncurrent	$ 2,843	2,650
PAC | Cost of removal
Regulatory Liabilities [Line Items]
Regulatory liability, amortization period	26 years
Total regulatory liabilities	$ 1,332	1,187
Regulatory liabilities, noncurrent	1,332	1,187
PAC | Deferred income taxes
Regulatory Liabilities [Line Items]
Total regulatory liabilities	$ 1,164	1,307
PAC | Unrealized gain on regulated derivatives
Regulatory Liabilities [Line Items]
Regulatory liability, amortization period	1 year
Total regulatory liabilities	$ 270	53
PAC | Other
Regulatory Liabilities [Line Items]
Total regulatory liabilities	$ 173	$ 221