Note 8 - Debt and Credit Facilities (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Debt [Table Text Block]

				December 31, 2012					December 31, 2011
Dollars in millions	Year(s) due			Weighted average interest rate (1)			Outstanding		Weighted average interest rate (1)			Outstanding
Short-term debt
Commercial paper - AGL Capital (2)		2013			0.5	%	$	1,063		0.4	%	$	869
Commercial paper- Nicor Gas (2)		2013			0.4			314		0.4			452
Total short-term debt					0.5	%	$	1,377		0.4	%	$	1,321
Current portion of long-term debt and capital leases
Current portion of long-term debt		2013			4.6			225		8.3			15
Current portion of capital leases		2013			4.9			1		4.9			2
Total current portion of long-term debt and capital leases					4.6	%	$	226		8.0	%	$	17
Long-term debt - excluding current portion
Senior notes	2015	-	2041		5.1	%	$	2,325		5.4	%	$	2,550
First mortgage bonds	2016	-	2038		5.6			500		5.6			500
Gas facility revenue bonds	2022	-	2033		1.2			200		1.2			200
Medium-term notes	2017	-	2027		7.8			181		7.8			181
Total principal long-term debt					5.0	%	$	3,206		5.7	%	$	3,431
Fair value adjustments (3)	2016	-	2038		n/a			103		n/a			112
Unamortized debt premium, net		n/a			n/a			18		n/a			18
Total non-principal long-term debt					n/a			121		n/a		$	130
Total long-term debt							$	3,327				$	3,561
Total debt							$	4,930				$	4,899

Schedule of Maturities of Long-term Debt [Table Text Block]

Year	Amount (in millions)
2013	$	225
2014		0
2015		200
2016		545
2017		22
Thereafter		2,439
Total	$	3,431

Schedule of Long-term Debt Instruments [Table Text Block]

	Issuance Date	Amount (in millions)		Maturity date	Interest rate
Public offering (1)	March 16, 2011	$	500	March 15, 2041		5.9	%
Public offering (2)	September 15, 2011	$	200	March 15, 2041		5.9	%
Public offering (2)	September 15, 2011	$	300	September 15, 2021		3.5	%
Private placement - Series A (2)	October 27, 2011	$	120	October 27, 2016		1.9	%
Private placement - Series B (2)	October 27, 2011	$	155	October 27, 2018		3.5	%

Schedule of Capitalization [Table Text Block]

	AGL Resources						Nicor Gas
	December 31,						December 31,
	2012			2011			2012			2011
Debt-to-capitalization ratio		58	%		58	%		55	%		60	%