Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 257	$ 30
Accounts receivable, net	271	253
Inventories, at average cost:
Materials and supplies	49	56
Fuel	23	40
Regulatory assets--current	23	17
Other current assets	98	104
Total current assets	721	500
Electric utility plant:
In service	10,974	10,928
Accumulated depreciation and amortization	(3,864)	(4,095)
In service, net	7,110	6,833
Public Utilities, Property, Plant and Equipment, Net	7,539	7,161
Construction work-in-progress	429	328
Regulatory assets--noncurrent	569	483
Nuclear decommissioning trust	45	46
Non-qualified benefit plan trust	42	38
Other noncurrent assets	153	166
Total assets	9,069	8,394
Current liabilities:
Accounts payable	153	165
Liabilities from price risk management activities-current	14	23
Short-term Debt	150	0
Current portion of long-term debt	160	0
Current portion of long-term debt	16	16
Accrued expenses and other current liabilities	322	315
Total current liabilities	815	519
Long-term debt, net of current portion	2,886	2,597
Regulatory liabilities--noncurrent	1,369	1,377
Deferred income taxes	374	378
Unfunded status of pension and postretirement plans	299	247
Liabilities from price risk management activities--noncurrent	136	108
Asset retirement obligations	270	263
Non-qualified benefit plan liabilities	101	103
Finance lease obligations, net of current portion	129	135
Other noncurrent liabilities	77	76
Total liabilities	6,456	5,803
Commitments and Contingencies (see notes)
Shareholders’ equity:
Preferred stock, no par value, 30,000,000 shares authorized; none issued and outstanding	0	0
Common stock, no par value, 160,000,000 shares authorized; 89,537,331 and 89,387,124 shares issued and outstanding as of December 31, 2020 and 2019, respectively	1,231	1,220
Accumulated other comprehensive loss	(11)	(10)
Retained earnings	1,393	1,381
Total shareholders' equity	2,613	2,591
Total liabilities and shareholders' equity	$ 9,069	$ 8,394
Preferred Stock, Shares Outstanding	0	0
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Authorized	30,000,000	30,000,000
Preferred Stock, No Par Value	$ 0	$ 0
Common Stock, Shares, Outstanding	89,537,331	89,387,124
Common Stock, Shares, Issued	89,537,331	89,387,124
Common Stock, No Par Value	$ 0	$ 0
Common Stock, Shares Authorized	160,000,000	160,000,000