CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Current assets
Cash, cash equivalents and restricted cash at beginning of period	$ 87.0	$ 28.0
Accounts receivable, net	363.0	342.0
Accounts receivable from affiliates	0.0	8.0
Investments under utility money pool arrangement	30.0	0.0
Accrued unbilled revenues	249.0	298.0
Inventories	231.0	189.0
Regulatory assets	277.0	121.0
Derivative instruments	91.0	21.0
Prepayments and other	79.0	82.0
Total current assets	1,407.0	1,089.0
Property, plant and equipment, net	18,120.0	17,470.0
Other assets
Regulatory assets	1,468.0	1,059.0
Derivative instruments	21.0	16.0
Operating lease right-of-use assets	433.0	500.0
Other	218.0	231.0
Total other assets	2,140.0	1,806.0
Total assets	21,667.0	20,365.0
Current liabilities
Current portion of long-term debt	300.0	0.0
Borrowings under utility money pool arrangement	0.0	57.0
Short-term debt	0.0	136.0
Accounts payable	510.0	452.0
Accounts payable to affiliates	67.0	58.0
Regulatory liabilities	103.0	100.0
Taxes accrued	201.0	251.0
Accrued interest	37.0	61.0
Dividends payable to parent	127.0	105.0
Derivative instruments	34.0	27.0
Operating lease liabilities	95.0	97.0
Other	103.0	84.0
Total current liabilities	1,577.0	1,428.0
Deferred credits and other liabilities
Deferred income taxes	1,969.0	1,897.0
Regulatory liabilities	2,394.0	2,337.0
Asset retirement obligations	411.0	399.0
Derivative instruments	19.0	51.0
Customer advances	163.0	168.0
Pension and employee benefit obligations	108.0	161.0
Operating lease liabilities	366.0	432.0
Other	184.0	176.0
Total deferred credits and other liabilities	5,614.0	5,621.0
Commitments and contingencies
Capitalization
Long-term debt	$ 6,166.0	$ 5,724.0
Common Stock, Shares Authorized	100	100
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares, Outstanding	100	100
Common stock — 100 shares authorized of $0.01 par value; 100 shares outstanding at Sept. 30, 2021 and Dec. 31, 2020, respectively	$ 0.0	$ 0.0
Additional paid in capital	6,333.0	5,770.0
Retained earnings	2,000.0	1,846.0
Accumulated other comprehensive loss	(23.0)	(24.0)
Total common stockholder's equity	8,310.0	7,592.0
Total liabilities and stockholder's equity	$ 21,667.0	$ 20,365.0