CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current Assets:
Cash and cash equivalents	$ 74,000,000	$ 230,000,000
Accounts receivable, less allowance for credit losses	889,000,000	690,000,000
Allowance for credit losses	38,000,000	44,000,000
Accrued unbilled revenues, allowance for credit loss	4,000,000	6,000,000
Prepaid expenses and other current assets	171,000,000	132,000,000
Other Assets:
Total Non-Current Regulatory Assets	$ 2,193,000,000	$ 2,321,000,000
Shareholders’ Equity:
Cumulative preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Cumulative preferred stock, authorized (in shares)	20,000,000	20,000,000	20,000,000
Cumulative preferred stock, outstanding (in shares)	800,000	800,000	2,402,400
Cumulative preferred stock, aggregate liquidation preference	$ 800	$ 800
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Common stock, authorized (in shares)	1,000,000,000	1,000,000,000	1,000,000,000
Common stock, outstanding (in shares)	629,535,631	628,923,534
Variable Interest Entity, Primary Beneficiary
Current Assets:
Cash and cash equivalents	$ 75,000,000	$ 92,000,000
Accounts receivable, less allowance for credit losses	22,000,000	29,000,000
Prepaid expenses and other current assets	13,000,000	19,000,000
Other Assets:
Total Non-Current Regulatory Assets	$ 229,000,000	$ 420,000,000