Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Cash and cash equivalents	$ 214	$ 74
Accounts receivable, less allowance for credit losses	638	889
Allowance for credit losses	41	38
Accrued unbilled revenues, allowance for credit losses	1	4
Prepaid expenses and other current assets	155	171
Regulatory assets	$ 2,495	$ 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)	800,000	800,000
Preferred stock aggregate liquidation preference	$ 800	$ 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)	631,073,571	629,535,631
Variable Interest Entity, Primary Beneficiary
Cash and cash equivalents	$ 63	$ 75
Accounts receivable, less allowance for credit losses	25	22
Prepaid expenses and other current assets	14	13
Regulatory assets	$ 497	$ 229