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Component: (Network and Table)
Network
2408409 - Disclosure - Employee Benefit Plans - Expected Benefit Payments (Details)
(http://www.aglresources.com/role/EmployeeBenefitPlansExpectedBenefitPaymentsDetails)
TableSchedule of Defined Benefit Plans Disclosures [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001004155 (http://www.sec.gov/CIK)
Period [Axis]2015-12-31
Defined Benefit Plan Disclosure [Line Items]Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
Pension Plan [Member]Other Postretirement Benefit Plan [Member]
2016
79,000,000  
20,000,000  
2017
68,000,000  
20,000,000  
2018
70,000,000  
21,000,000  
2019
73,000,000  
22,000,000  
2020
75,000,000  
23,000,000  
2021-2025
374,000,000  
116,000,000