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Note 8 - Debt and Credit Facilities (Details) - Debt-to-Capitalization Ratios
Dec. 31, 2014
Dec. 31, 2013
AGL Resources Inc [Member]    
Schedule of Capitalization [Line Items]    
Debt-to-capitalization ratio 0.55us-gaap_RatioOfIndebtednessToNetCapital1
/ us-gaap_StatementBusinessSegmentsAxis
= gas_AGLResourcesIncMember		 0.57us-gaap_RatioOfIndebtednessToNetCapital1
/ us-gaap_StatementBusinessSegmentsAxis
= gas_AGLResourcesIncMember
Nicor Gas [Member]    
Schedule of Capitalization [Line Items]    
Debt-to-capitalization ratio 0.62us-gaap_RatioOfIndebtednessToNetCapital1
/ us-gaap_StatementBusinessSegmentsAxis
= gas_NicorGasMember		 0.55us-gaap_RatioOfIndebtednessToNetCapital1
/ us-gaap_StatementBusinessSegmentsAxis
= gas_NicorGasMember