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Note 7 - Debt and Credit Facilities (Details) - Debt Schedule - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Long-term debt - excluding current portion      
Total long-term debt – excluding current portion $ 3,452 $ 3,581 $ 3,585
Total debt $ 4,036 4,956 $ 4,233
Current Portion Long-Term Debt [Member]      
Short-term debt      
Maturity Date 2016    
Weighted average interest rate [1] 4.60%   5.00%
Outstanding $ 125 200 $ 200
Long-term debt - excluding current portion      
Maturity Date 2016    
Senior Notes [Member]      
Long-term debt - excluding current portion      
Weighted average interest rate [1] 5.00%   5.00%
Outstanding $ 2,625 2,625 $ 2,625
First Mortgage Bonds [Member]      
Long-term debt - excluding current portion      
Weighted average interest rate [1] 5.90%   5.60%
Outstanding $ 375 500 $ 500
Gas Facility Revenue Bonds [Member]      
Long-term debt - excluding current portion      
Weighted average interest rate [1] 0.90%   0.90%
Outstanding $ 200 200 $ 200
Medium-term Notes [Member]      
Long-term debt - excluding current portion      
Weighted average interest rate [1] 7.80%   7.80%
Outstanding $ 181 181 $ 181
Long-term Debt Principal [Member]      
Long-term debt - excluding current portion      
Weighted average interest rate [1] 4.90%   4.90%
Outstanding $ 3,381 3,506 $ 3,506
Long-term Debt Fair Value Adjustment [Member]      
Short-term debt      
Maturity Date n/a    
Long-term debt - excluding current portion      
Maturity Date n/a    
Weighted average interest rate [1],[2]      
Outstanding [2] $ 74 80 $ 85
Unamortized Debt Premium Discount and Issuance Costs, Net [Member]      
Short-term debt      
Maturity Date n/a    
Long-term debt - excluding current portion      
Maturity Date n/a    
Weighted average interest rate [1]      
Outstanding $ (3) (5) $ (6)
Long-term Debt Non-principal [Member]      
Long-term debt - excluding current portion      
Weighted average interest rate [1]      
Outstanding $ 71 75 $ 79
Commercial Paper [Member]      
Short-term debt      
Weighted average interest rate [1] 0.40%   0.30%
Outstanding $ 459 1,175 $ 448
Commercial Paper [Member] | AGL Capital [Member]      
Short-term debt      
Maturity Date 2015    
Weighted average interest rate [1],[3] 0.50%   0.30%
Outstanding [3] $ 269 590 $ 236
Long-term debt - excluding current portion      
Maturity Date 2015    
Commercial Paper [Member] | Nicor Gas [Member]      
Short-term debt      
Maturity Date 2015    
Weighted average interest rate [1],[3] 0.40%   0.20%
Outstanding [3] $ 190 $ 585 $ 212
Long-term debt - excluding current portion      
Maturity Date 2015    
Minimum [Member] | Senior Notes [Member]      
Short-term debt      
Maturity Date 2016    
Long-term debt - excluding current portion      
Maturity Date 2016    
Minimum [Member] | First Mortgage Bonds [Member]      
Short-term debt      
Maturity Date 2019    
Long-term debt - excluding current portion      
Maturity Date 2019    
Minimum [Member] | Gas Facility Revenue Bonds [Member]      
Short-term debt      
Maturity Date 2022    
Long-term debt - excluding current portion      
Maturity Date 2022    
Minimum [Member] | Medium-term Notes [Member]      
Short-term debt      
Maturity Date 2017    
Long-term debt - excluding current portion      
Maturity Date 2017    
Maximum [Member] | Senior Notes [Member]      
Short-term debt      
Maturity Date 2043    
Long-term debt - excluding current portion      
Maturity Date 2043    
Maximum [Member] | First Mortgage Bonds [Member]      
Short-term debt      
Maturity Date 2038    
Long-term debt - excluding current portion      
Maturity Date 2038    
Maximum [Member] | Gas Facility Revenue Bonds [Member]      
Short-term debt      
Maturity Date 2033    
Long-term debt - excluding current portion      
Maturity Date 2033    
Maximum [Member] | Medium-term Notes [Member]      
Short-term debt      
Maturity Date 2027    
Long-term debt - excluding current portion      
Maturity Date 2027    
[1] Interest rates are calculated based on the daily weighted average balance outstanding for the six months ended June 30.
[2] See Note 4 for additional information on our fair value measurements.
[3] As of June 30, 2015, the effective interest rates on our commercial paper borrowings were 0.5% for AGL Capital and 0.4% for Nicor Gas.