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Note 2 - Significant Accounting Policies and Methods of Application (Details) - Purchase Price Allocation (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Jan. 31, 2013
NiSource Inc. [Member]
Business Acquisition [Line Items]        
Current assets       $ 5
PP&E       11
Goodwill 1,883 1,837 1,813 46
Intangible assets       64
Current liabilities       (4)
Total purchase price       $ 122