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Note 11 - Commitments, Guarantees and Contingencies (Details) - Recorded and Unrecorded Contractual Obligations (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Recorded contractual obligations:  
Recorded contractual obligations $ 5,295us-gaap_RecordedUnconditionalPurchaseObligation
Recorded contractual obligations, 2015 1,462us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear
Recorded contractual obligations, 2016 638us-gaap_RecordedUnconditionalPurchaseObligationDueInSecondYear
Recorded contractual obligations, 2017 77us-gaap_RecordedUnconditionalPurchaseObligationDueInThirdYear
Recorded contractual obligations, 2018 202us-gaap_RecordedUnconditionalPurchaseObligationDueInFourthYear
Recorded contractual obligations, 2019 387us-gaap_RecordedUnconditionalPurchaseObligationDueInFifthYear
Recorded contractual obligations, 2020 & thereafter 2,529us-gaap_RecordedUnconditionalPurchaseObligationDueAfterFifthYear
Unrecorded contractual obligations and commitments(3) (8):  
Unrecorded contractual obligations and commitments 7,343us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount [1],[2]
Unrecorded contractual obligations and commitments, 2015 1,078us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary [1],[2]
Unrecorded contractual obligations and commitments, 2016 673us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary [1],[2]
Unrecorded contractual obligations and commitments, 2017 459us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary [1],[2]
Unrecorded contractual obligations and commitments, 2018 402us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary [1],[2]
Unrecorded contractual obligations and commitments, 2019 383us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary [1],[2]
Unrecorded contractual obligations and commitments, 2020 & thereafter 4,348us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears [1],[2]
Long-term Debt [Member]  
Recorded contractual obligations:  
Recorded contractual obligations 3,706us-gaap_RecordedUnconditionalPurchaseObligation
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_LongTermDebtMember		 [3]
Recorded contractual obligations, 2015 200us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_LongTermDebtMember		 [3]
Recorded contractual obligations, 2016 545us-gaap_RecordedUnconditionalPurchaseObligationDueInSecondYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_LongTermDebtMember		 [3]
Recorded contractual obligations, 2017 22us-gaap_RecordedUnconditionalPurchaseObligationDueInThirdYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_LongTermDebtMember		 [3]
Recorded contractual obligations, 2018 155us-gaap_RecordedUnconditionalPurchaseObligationDueInFourthYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_LongTermDebtMember		 [3]
Recorded contractual obligations, 2019 350us-gaap_RecordedUnconditionalPurchaseObligationDueInFifthYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_LongTermDebtMember		 [3]
Recorded contractual obligations, 2020 & thereafter 2,434us-gaap_RecordedUnconditionalPurchaseObligationDueAfterFifthYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_LongTermDebtMember		 [3]
Short-term Debt [Member]  
Recorded contractual obligations:  
Recorded contractual obligations 1,175us-gaap_RecordedUnconditionalPurchaseObligation
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_ShortTermDebtMember
Recorded contractual obligations, 2015 1,175us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_ShortTermDebtMember
Environmental Remediation Liabilities [Member]  
Recorded contractual obligations:  
Recorded contractual obligations 414us-gaap_RecordedUnconditionalPurchaseObligation
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_EnvironmentalRemediationLiabilitiesMember		 [4]
Recorded contractual obligations, 2015 87us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_EnvironmentalRemediationLiabilitiesMember		 [4]
Recorded contractual obligations, 2016 93us-gaap_RecordedUnconditionalPurchaseObligationDueInSecondYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_EnvironmentalRemediationLiabilitiesMember		 [4]
Recorded contractual obligations, 2017 55us-gaap_RecordedUnconditionalPurchaseObligationDueInThirdYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_EnvironmentalRemediationLiabilitiesMember		 [4]
Recorded contractual obligations, 2018 47us-gaap_RecordedUnconditionalPurchaseObligationDueInFourthYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_EnvironmentalRemediationLiabilitiesMember		 [4]
Recorded contractual obligations, 2019 37us-gaap_RecordedUnconditionalPurchaseObligationDueInFifthYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_EnvironmentalRemediationLiabilitiesMember		 [4]
Recorded contractual obligations, 2020 & thereafter 95us-gaap_RecordedUnconditionalPurchaseObligationDueAfterFifthYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_EnvironmentalRemediationLiabilitiesMember		 [4]
Pipeline Charges, Storage Capacity and Gas Supply [Member]  
Unrecorded contractual obligations and commitments(3) (8):  
Unrecorded contractual obligations and commitments 4,303us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_PipelineChargesStorageCapacityAndGasSupplyMember		 [1],[2],[5]
Unrecorded contractual obligations and commitments, 2015 805us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_PipelineChargesStorageCapacityAndGasSupplyMember		 [1],[2],[5]
Unrecorded contractual obligations and commitments, 2016 457us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_PipelineChargesStorageCapacityAndGasSupplyMember		 [1],[2],[5]
Unrecorded contractual obligations and commitments, 2017 280us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_PipelineChargesStorageCapacityAndGasSupplyMember		 [1],[2],[5]
Unrecorded contractual obligations and commitments, 2018 234us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_PipelineChargesStorageCapacityAndGasSupplyMember		 [1],[2],[5]
Unrecorded contractual obligations and commitments, 2019 222us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_PipelineChargesStorageCapacityAndGasSupplyMember		 [1],[2],[5]
Unrecorded contractual obligations and commitments, 2020 & thereafter 2,305us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_PipelineChargesStorageCapacityAndGasSupplyMember		 [1],[2],[5]
Interest Charges [Member]  
Unrecorded contractual obligations and commitments(3) (8):  
Unrecorded contractual obligations and commitments 2,762us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_InterestChargesMember		 [1],[2],[6]
Unrecorded contractual obligations and commitments, 2015 179us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_InterestChargesMember		 [1],[2],[6]
Unrecorded contractual obligations and commitments, 2016 171us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_InterestChargesMember		 [1],[2],[6]
Unrecorded contractual obligations and commitments, 2017 147us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_InterestChargesMember		 [1],[2],[6]
Unrecorded contractual obligations and commitments, 2018 146us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_InterestChargesMember		 [1],[2],[6]
Unrecorded contractual obligations and commitments, 2019 141us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_InterestChargesMember		 [1],[2],[6]
Unrecorded contractual obligations and commitments, 2020 & thereafter 1,978us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_InterestChargesMember		 [1],[2],[6]
Operating Leases [Member]  
Unrecorded contractual obligations and commitments(3) (8):  
Unrecorded contractual obligations and commitments 188us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_OperatingLeasesMember		 [1],[2],[7]
Unrecorded contractual obligations and commitments, 2015 33us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_OperatingLeasesMember		 [1],[2],[7]
Unrecorded contractual obligations and commitments, 2016 31us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_OperatingLeasesMember		 [1],[2],[7]
Unrecorded contractual obligations and commitments, 2017 24us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_OperatingLeasesMember		 [1],[2],[7]
Unrecorded contractual obligations and commitments, 2018 17us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_OperatingLeasesMember		 [1],[2],[7]
Unrecorded contractual obligations and commitments, 2019 18us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_OperatingLeasesMember		 [1],[2],[7]
Unrecorded contractual obligations and commitments, 2020 & thereafter 65us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_OperatingLeasesMember		 [1],[2],[7]
Asset Management Agreements [Member]  
Unrecorded contractual obligations and commitments(3) (8):  
Unrecorded contractual obligations and commitments 32us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_AssetManagementAgreementsMember		 [1],[2],[8]
Unrecorded contractual obligations and commitments, 2015 9us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_AssetManagementAgreementsMember		 [1],[2],[8]
Unrecorded contractual obligations and commitments, 2016 10us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_AssetManagementAgreementsMember		 [1],[2],[8]
Unrecorded contractual obligations and commitments, 2017 7us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_AssetManagementAgreementsMember		 [1],[2],[8]
Unrecorded contractual obligations and commitments, 2018 4us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_AssetManagementAgreementsMember		 [1],[2],[8]
Unrecorded contractual obligations and commitments, 2019 2us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_AssetManagementAgreementsMember		 [1],[2],[8]
Unrecorded contractual obligations and commitments, 2020 & thereafter    [1],[2],[8]
Standby Letters of Credit, Performance and Surety Bonds [Member]  
Unrecorded contractual obligations and commitments(3) (8):  
Unrecorded contractual obligations and commitments 50us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_StandbyLettersOfCreditPerformanceAndSuretyBondsMember		 [1],[2]
Unrecorded contractual obligations and commitments, 2015 49us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_StandbyLettersOfCreditPerformanceAndSuretyBondsMember		 [1],[2]
Unrecorded contractual obligations and commitments, 2016 1us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_StandbyLettersOfCreditPerformanceAndSuretyBondsMember		 [1],[2]
Unrecorded contractual obligations and commitments, 2017    [1],[2]
Unrecorded contractual obligations and commitments, 2018    [1],[2]
Unrecorded contractual obligations and commitments, 2019    [1],[2]
Unrecorded contractual obligations and commitments, 2020 & thereafter    [1],[2]
Other Obligations [Member]  
Unrecorded contractual obligations and commitments(3) (8):  
Unrecorded contractual obligations and commitments 8us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_OtherObligationsMember		 [1],[2]
Unrecorded contractual obligations and commitments, 2015 3us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_OtherObligationsMember		 [1],[2]
Unrecorded contractual obligations and commitments, 2016 3us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_OtherObligationsMember		 [1],[2]
Unrecorded contractual obligations and commitments, 2017 1us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_OtherObligationsMember		 [1],[2]
Unrecorded contractual obligations and commitments, 2018 1us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= gas_OtherObligationsMember		 [1],[2]
Unrecorded contractual obligations and commitments, 2019    [1],[2]
Unrecorded contractual obligations and commitments, 2020 & thereafter    [1],[2]
[1] In accordance with GAAP, these items are not reflected in our Consolidated Statements of Financial Position.
[2] We provide guarantees to certain municipalities and other agencies and certain gas suppliers of SouthStar in support of payment obligations.
[3] Excludes the $75 million step up to fair value of first mortgage bonds, $16 million unamortized debt premium and $5 million interest rate swaps fair value adjustment. Includes our current portion of long-term debt of $200 million, which matured in January 2015.
[4] Includes charges recoverable through base rates or rate rider mechanisms.
[5] Includes charges recoverable through a natural gas cost recovery mechanism or alternatively billed to Marketers and demand charges associated with Sequent. The gas supply balance includes amounts for Nicor Gas and SouthStar gas commodity purchase commitments of 51 Bcf at floating gas prices calculated using forward natural gas prices as of December 31, 2014, and is valued at $142 million. As we do for other subsidiaries, we provide guarantees to certain gas suppliers for SouthStar in support of payment obligations.
[6] Floating rate interest charges are calculated based on the interest rate as of December 31, 2014 and the maturity date of the underlying debt instrument. As of December 31, 2014, we have $53 million of accrued interest on our Consolidated Statements of Financial Position that will be paid in 2015.
[7] We have certain operating leases with provisions for step rent or escalation payments and certain lease concessions. We account for these leases by recognizing the future minimum lease payments on a straight-line basis over the respective minimum lease terms, in accordance with GAAP. However, this lease accounting treatment does not affect the future annual operating lease cash obligations as shown herein. Our operating leases are primarily for real estate.
[8] Represent fixed-fee minimum payments for Sequent's affiliated asset management agreements.