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Balance Sheet Components (Tables)
 6 Months Ended
Jun. 30, 2011
Balance Sheet Components [Abstract]  
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
The activity in the allowance for uncollectible accounts is as follows (in millions):


 
Six Months Ended

June 30,
 
2011
 
2010
Balance as of beginning of period
$
5


 
$
5


Provision, net
3


 
3


Amounts written off, less recoveries
(3
)
 
(3
)
Balance as of end of period
$
5


 
$
5
Schedule of Public Utility Property, Plant, and Equipment [Table Text Block]
Electric utility plant, net consists of the following (in millions):


 
June 30,

2011
 
December 31,

2010
Electric utility plant
$
6,458


 
$
6,279


Construction work in progress
121


 
125


Total cost
6,579


 
6,404


Less: accumulated depreciation and amortization
(2,352
)
 
(2,271
)
Electric utility plant, net
$
4,227


 
$
4,133


 
In 2011, $7 million of costs related to the Cascade Crossing Transmission Project were transferred to Construction work in progress. Such costs were previously included within preliminary engineering, which is included in Other noncurrent assets in the condensed consolidated balance sheets.


Accumulated depreciation and amortization in the table above includes accumulated amortization related to intangible assets of $143 million and $133 million as of June 30, 2011 and December 31, 2010, respectively.
Schedule of Regulatory Assets and Liabilities [Text Block]
Regulatory assets and liabilities consist of the following (in millions):


 
June 30, 2011
 
December 31, 2010
 
Current
 
Noncurrent
 
Current
 
Noncurrent
Regulatory assets:
 
 
 
 
 
 
 
Price risk management
$
153


 
$
142


 
$
175


 
$
185


Pension and other postretirement plans
—


 
207


 
—


 
213


Deferred income taxes
—


 
91


 
—


 
95


Deferred broker settlements
12


 
—


 
24


 
—


Renewable energy deferral
12


 
—


 
22


 
—


Debt reacquisition costs
—


 
22


 
—


 
23


Other
7


 
19


 
—


 
28


Total regulatory assets
$
184


 
$
481


 
$
221


 
$
544


Regulatory liabilities:
 
 
 
 
 
 
 
Asset retirement removal costs
$
—


 
$
612


 
$
—


 
$
588


Asset retirement obligations
—


 
34


 
—


 
33


Power cost adjustment mechanism
—


 
12


 
—


 
—


Regulatory treatment of income taxes (SB 408)
8


 
1


 
5


 
9


Trojan ISFSI pollution control tax credits
9


 
5


 
18


 
4


Other
2


 
28


 
2


 
23


Total regulatory liabilities
$
19


 
$
692


 
$
25


 
$
657
Other Liabilities Disclosure [Text Block]
Other current liabilities consist of the following (in millions):


 
June 30,

2011
 
December 31, 2010
Accrued interest payable
$
26


 
$
26


Accrued taxes payable
19


 
22


Accrued dividends payable
21


 
20


Other
8


 
10


Total other current liabilities
$
74


 
$
78
Pension and Other Postretirement Benefits Disclosure [Text Block]
Components of net periodic benefit cost are as follows for the three months ended June 30 (in millions):


 
Defined Benefit
Pension Plan
 
Other Postretirement
Benefit Plans
 
Non-Qualified
Benefit Plans
 
2011
 
2010
 
2011
 
2010
 
2011
 
2010
Service cost
$
3


 
$
3


 
$
—


 
$
—


 
$
—


 
$
—


Interest cost
7


 
7


 
1


 
1


 
—


 
—


Expected return on plan assets
(10
)
 
(10
)
 
—


 
—


 
—


 
—


Amortization of net actuarial gain
2


 
1


 
—


 
1


 
—


 
—


Net periodic benefit cost
$
2


 
$
1


 
$
1


 
$
2


 
$
—


 
$
—


 


Components of net periodic benefit cost are as follows for the six months ended June 30 (in millions):


 
Defined Benefit
Pension Plan
 
Other Postretirement
Benefit Plans
 
Non-Qualified
Benefit Plans
 
2011
 
2010
 
2011
 
2010
 
2011
 
2010
Service cost
$
6


 
$
6


 
$
1


 
$
1


 
$
—


 
$
—


Interest cost
14


 
14


 
2


 
2


 
1


 
1


Expected return on plan assets
(20
)
 
(20
)
 
—


 
—


 
—


 
—


Amortization of net actuarial gain
4


 
2


 
—


 
1


 
—


 
—


Net periodic benefit cost
$
4


 
$
2


 
$
3


 
$
4


 
$
1


 
$
1