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Note 7 - Debt and Credit Facilities (Details)
$ in Millions
6 Months Ended 12 Months Ended
Jan. 23, 2015
USD ($)
Jan. 15, 2015
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Note 7 - Debt and Credit Facilities (Details) [Line Items]          
Proceeds from (Repayments of) Commercial Paper     $ (716) $ (723)  
Repayments of Senior Debt   $ 200 $ 200    
AGL Capital [Member] | Commercial Paper [Member]          
Note 7 - Debt and Credit Facilities (Details) [Line Items]          
Debt Instrument, Interest Rate, Effective Percentage     0.50%    
Nicor Gas [Member]          
Note 7 - Debt and Credit Facilities (Details) [Line Items]          
Ratio of Indebtedness to Net Capital [1]     0.49 0.52 0.62
Nicor Gas [Member] | Commercial Paper [Member]          
Note 7 - Debt and Credit Facilities (Details) [Line Items]          
Debt Instrument, Interest Rate, Effective Percentage     0.40%    
Adjustments for New Accounting Principle, Early Adoption [Member] | Other Long-term Assets [Member]          
Note 7 - Debt and Credit Facilities (Details) [Line Items]          
Prior Period Reclassification Adjustment     $ 19 $ 22 $ 21
Adjustments for New Accounting Principle, Early Adoption [Member] | Long-term Debt 1 [Member]          
Note 7 - Debt and Credit Facilities (Details) [Line Items]          
Prior Period Reclassification Adjustment     $ 19 $ 22 $ 21
Interest Rate Swap [Member]          
Note 7 - Debt and Credit Facilities (Details) [Line Items]          
Derivative, Notional Amount $ 800        
Minimum [Member] | Target ratio [Member]          
Note 7 - Debt and Credit Facilities (Details) [Line Items]          
Ratio of Indebtedness to Net Capital     0.50    
Minimum [Member] | Commercial Paper [Member]          
Note 7 - Debt and Credit Facilities (Details) [Line Items]          
Debt Instrument, Term     1 day    
Debt Instrument, Remaining Maturity Term     1 day    
Minimum [Member] | Interest Rate Swap [Member]          
Note 7 - Debt and Credit Facilities (Details) [Line Items]          
Derivative, Term of Contract 10 years        
Maximum [Member]          
Note 7 - Debt and Credit Facilities (Details) [Line Items]          
Ratio of Indebtedness to Net Capital     0.70    
Maximum [Member] | Target ratio [Member]          
Note 7 - Debt and Credit Facilities (Details) [Line Items]          
Ratio of Indebtedness to Net Capital     0.60    
Maximum [Member] | Commercial Paper [Member]          
Note 7 - Debt and Credit Facilities (Details) [Line Items]          
Debt Instrument, Term     58 days    
Debt Instrument, Remaining Maturity Term     21 days    
Maximum [Member] | Interest Rate Swap [Member]          
Note 7 - Debt and Credit Facilities (Details) [Line Items]          
Derivative, Term of Contract 30 years        
[1] As defined in our credit facilities, includes standby letters of credit and performance/surety bonds and excludes accumulated OCI items related to non-cashpension adjustments, welfare benefits liability adjustments and accounting for cash flow hedges.