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Regulatory Assets and Liabilities
9 Months Ended
Sep. 30, 2011
Regulatory Assets and Liabilities Disclosure [Abstract] 
Regulatory Assets and Liabilities
Regulatory Assets and Liabilities
Regulatory assets included on the consolidated balance sheets are:
(in millions)
September 30,
2011
 
December 31,
2010
Current:
 
 
 
Regulatory balancing accounts
$
191

 
$
213

Energy derivatives
262

 
162

Other
1

 
3

Total Current
454

 
378

Long-term:
 
 
 
Deferred income taxes – net
1,938

 
1,855

Pensions and other postretirement benefits
1,084

 
1,097

Unamortized generation investment – net
323

 
355

Unamortized loss on reacquired debt
253

 
268

Energy derivatives
505

 
177

Nuclear related investment – net
160

 
154

Unamortized transmission and distribution investment – net
153

 
105

Regulatory balancing accounts
62

 
56

Other
299

 
280

Total Long-term
4,777

 
4,347

Total Regulatory Assets
$
5,231

 
$
4,725

Regulatory liabilities included on the consolidated balance sheets are:
(in millions)
September 30,
2011
 
December 31,
2010
Current:
 
 
 
Regulatory balancing accounts
$
728

 
$
733

Other
6

 
5

Total Current
734

 
738

Long-term:
 
 
 
Costs of removal
2,663

 
2,623

Asset Retirement Obligations
944

 
1,099

Regulatory balancing accounts
873

 
802

Other
1

 

Total Long-term
4,481

 
4,524

Total Regulatory Liabilities
$
5,215

 
$
5,262