Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Cash and cash equivalents	$ 120	$ 74
Accounts receivable, less allowance for credit losses	767	889
Allowance for credit losses	31	38
Accrued unbilled revenues, allowance for credit losses	1	4
Prepaid expenses and other current assets	134	171
Regulatory assets	$ 2,481	$ 2,193
Preferred Stock [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	20,000,000	20,000,000
Preferred stock, outstanding (in shares)	0	800,000
Preferred stock aggregate liquidation preference	$ 0	$ 800
Common Stock [Abstract]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, outstanding (in shares)	631,209,962	629,535,631
Variable Interest Entity, Primary Beneficiary
Cash and cash equivalents	$ 118	$ 75
Accounts receivable, less allowance for credit losses	32	22
Accrued unbilled revenues, after allowance for credit losses, current	2	0
Prepaid expenses and other current assets	14	13
Regulatory assets	$ 438	$ 229