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Asset Retirement Obligations (Details) (USD $)
In Millions
9 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Asset Retirement Obligation [Rollforward]  
Balance at Beginning of Period$ 448 
Accretion expense25 
Obligations assumed in acquisition of WPD Midlands15[1] 
New obligations incurred11 
Changes in estimated cash flow or settlement date3 
Effect of foreign currency exchange rates0 
Obligations settled(13) 
Liabilities incurred11 
Balance at End of Period489 
Asset Retirement Obligation Balance Classification [Abstract]  
Current portion10[2]13[2]
Long-term portion479435
Total489 
Susquehanna Nuclear Station ARO (Numeric) [Abstract]  
Susquehanna accrued nuclear decommissioning obligation287270
Susquehanna NDT funds$ 594$ 618
[1]Obligations required under U.K. law related to treated wood poles, gas-filled switchgear and fluid-filled cables. See Note 8 for additional information on the acquisition.
[2]Included in "Other current liabilities."