Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Property, plant and equipment
Utility plant in service, at original costs	$ 10,427	$ 10,019
Construction work in progress	263	892
Accumulated depreciation	(2,994)	(2,826)
Utility plant in service, net	7,433	7,193
Other property	11	10
Total property, plant and equipment, net	7,444	7,203
Current assets
Cash and cash equivalents	13	10
Receivables, less allowance for uncollectibles of $1 at December 31, 2017 and 2016	257	206
Due from affiliates	5	7
Inventories, at average cost
Current derivative assets	0	15
Regulatory assets	77	28
Prepayments and other current assets	13	21
Total current assets	515	450
Deferred debits
Regulatory assets	356	393
Other	49	37
Total deferred debits	405	430
Total assets	8,364	8,083
Capitalization
Common stock	2,645	2,456
Accumulated other comprehensive loss	(2)	(3)
Retained earnings	335	311
Total capital	2,978	2,764
Long-term debt, less amount due within one year	1,860	2,163
Total capital	4,838	4,927
Current liabilities
Long-term debt due within one year	304	0
Notes payable	305	170
Accounts payable	233	262
Due to affiliates	21	25
Customer deposits	131	146
Regulatory liabilities	58	154
Accrued interest	14	16
Accrued taxes	12	12
Other	44	11
Total current liabilities	1,122	796
Long-term liabilities
Deferred income taxes	825	1,407
Regulatory liabilities	1,227	591
Deferred credits and other liabilities	352	362
Total deferred credits	2,404	2,360
Commitments and Contingencies (see Note 9)
Total liabilities and capital	8,364	8,083
Fuel [Member]
Inventories, at average cost
Utility inventories	60	77
Materials and Supplies [Member]
Inventories, at average cost
Utility inventories	90	86
Electric [Member]
Property, plant and equipment
Utility plant in service, at original costs	8,555	7,624
Gas [Member]
Property, plant and equipment
Utility plant in service, at original costs	$ 1,609	$ 1,503