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Balance Sheet Components Balance Sheet Components (Tables)
 12 Months Ended
Dec. 31, 2011
Balance Sheet Components [Abstract]  
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
The following is the activity in the allowance for uncollectible accounts (in millions):
 
 
Years Ended December 31,
 
2011
 
2010
 
2009
Balance as of beginning of year
$
5

 
$
5

 
$
4

Increase in provision
11

 
7

 
9

Amounts written off, less recoveries
(10
)
 
(7
)
 
(8
)
Balance as of end of year
$
6

 
$
5

 
$
5

 
 
 
 
 
 
Investments held in trust [Table Text Block]
The trusts are comprised of the following investments as of December 31 (in millions):
 
 
Nuclear
    Decommissioning Trust    
 
    Non-Qualified Benefit    
Plan Trust
 
2011
 
2010
 
2011
 
2010
Cash equivalents
$
14

 
$
13

 
$
—

 
$
—

Marketable securities, at fair value:
 
 
 
 
 
 
 
Equity securities
—

 
—

 
10

 
19

Debt securities
23

 
21

 
3

 
2

Insurance contracts, at cash surrender value
—

 
—

 
23

 
23

 
$
37

 
$
34

 
$
36

 
$
44

 
 
 
 
 
 
 
 
Schedule of Other Assets and Other Liabilities [Table Text Block]
Other current assets and Accrued expenses and other current liabilities consist of the following (in millions):

 
As of December 31,
 
2011
 
2010
Other current assets:
 
 
 
Current deferred income tax asset
$
33

 
$
—

Assets from price risk management activities
19

 
13

Income taxes receivable
12

 
22

Other
34

 
32

 
$
98

 
$
67

 
 
 
 
Accrued expenses and other current liabilities:
 
 
 
Accrued employee compensation and benefits
$
44

 
$
36

Accrued interest payable
24

 
26

Dividends payable
21

 
20

Other
62

 
63

 
$
151

 
$
145