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Note 12 - Discontinued Operations (Details) (USD $)
3 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Sep. 01, 2014
Sep. 30, 2014
Sep. 30, 2014
Note 12 - Discontinued Operations (Details) [Line Items]          
Discontinued Operation, Tax Effect of Discontinued Operation   $ (32,000,000)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation      
Income Tax Expense (Benefit) 118,000,000us-gaap_IncomeTaxExpenseBenefit 203,000,000us-gaap_IncomeTaxExpenseBenefit      
Distributed Earnings Of Foreign Subsidiaries [Member] | Tropical Shipping [Member]          
Note 12 - Discontinued Operations (Details) [Line Items]          
Discontinued Operation, Tax Effect of Discontinued Operation     60,000,000us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= gas_TropicalShippingMember
/ us-gaap_NatureOfExpenseAxis
= gas_DistributedEarningsOfForeignSubsidiariesMember
   
Distributed Earnings Of Foreign Subsidiaries [Member]          
Note 12 - Discontinued Operations (Details) [Line Items]          
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount       86,000,000us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings
/ us-gaap_NatureOfExpenseAxis
= gas_DistributedEarningsOfForeignSubsidiariesMember
 
Tropical Shipping [Member]          
Note 12 - Discontinued Operations (Details) [Line Items]          
Proceeds from Divestiture of Businesses     225,000,000us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= gas_TropicalShippingMember
   
Discontinued Operation, Tax Effect of Discontinued Operation   31,000,000us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= gas_TropicalShippingMember
  29,000,000us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= gas_TropicalShippingMember
 
Goodwill, Impairment Loss, Net of Tax   19,000,000us-gaap_GoodwillImpairmentLossNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= gas_TropicalShippingMember
     
Income Tax Expense (Benefit)   0us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= gas_TropicalShippingMember
     
Depreciation And Amortization Suspension         $ 7,000,000gas_DepreciationAndAmortizationSuspension
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= gas_TropicalShippingMember