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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2011
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]
 
2011
 
2010
 
(In millions)
Property, Plant and Equipment
 
 
 
Electric Utility
 
 
 
Generation
$
9,785

 
$
9,268

Distribution
7,003

 
6,800

Total Electric Utility
16,788

 
16,068

Gas Utility
 
 
 
Distribution
2,561

 
2,460

Storage
406

 
395

Other
902

 
991

Total Gas Utility
3,869

 
3,846

Non-utility and other
1,884

 
1,660

Total
22,541

 
21,574

Less Accumulated Depreciation, Depletion and Amortization
 
 
 
Electric Utility
 
 
 
Generation
(3,946
)
 
(3,850
)
Distribution
(2,580
)
 
(2,568
)
Total Electric Utility
(6,526
)
 
(6,418
)
Gas Utility
 
 
 
Distribution
(1,041
)
 
(1,019
)
Storage
(127
)
 
(108
)
Other
(413
)
 
(512
)
Total Gas Utility
(1,581
)
 
(1,639
)
Non-utility and other
(688
)
 
(525
)
Total
(8,795
)
 
(8,582
)
Net Property, Plant and Equipment
$
13,746

 
$
12,992
Useful Life [Table Text Block]
 
 
Estimated Useful Lives in Years
Utility
 
Generation
 
Distribution
 
Transmission
Electric
 
46
 
43
 
N/A
Gas
 
N/A
 
62
 
61