Note 2 - Significant Accounting Policies and Methods of Application (Tables)

12 Months Ended

Dec. 31, 2013

Note 2 - Significant Accounting Policies and Methods of Application (Tables) [Line Items]

Schedules of Concentration of Risk, by Risk Factor [Table Text Block]

Dollars in millions	Total (1)		# of top counterparties		Concentration risk %
Credit exposure	$	274		20		51	%

Schedule of Inventory Lower of Cost or Market Adjustment [Table Text Block]

In millions	2013		2012		2011
Retail operations	$	1	$	3	$	5
Wholesale services		8		19		31
Midstream operations		-		1		-

Property, Plant and Equipment [Table Text Block]

In millions	2013		2012
Transportation and distribution (1)	$	8,371	$	7,979
Storage facilities		1,170		1,149
Other		854		820
Construction work in progress		543		371
Total PP&E, gross		10,938		10,319
Less accumulated depreciation (1)		2,295		2,114
Total PP&E, net (1)	$	8,643	$	8,205

Schedule of Goodwill [Table Text Block]

In millions	Distribution Operations		Retail Operations			Wholesale Services			Midstream Operations			Other			Consolidated (1)
Goodwill - December 31, 2011	$	1,586	$	124		$	2		$	16		$	8		$	1,736
Adjustments to initial Nicor purchase price allocation and other		54		(2	)		(2	)		(2	)		(8	)		40
Goodwill - December 31, 2012		1,640		122			-			14			-			1,776
2013 acquisitions		-		51			-			-			-			51
Goodwill - December 31, 2013	$	1,640	$	173		$	-		$	14		$	-		$	1,827

Schedule of Finite-Lived Intangible Assets [Table Text Block]

	Weighted average		December 31, 2013 (1)							December 31, 2012 (1)
In millions	amortization period (in years)		Gross		Accumulated amortization			Net		Gross		Accumulated amortization			Net
Customer relationships
Retail operations		13	$	130	$	(25	)	$	105	$	53	$	(11	)	$	42
Trade names
Retail operations		13		45		(5	)		40		30		(2	)		28
Wholesale services		-		-		-			-		1		-			1
Total			$	175	$	(30	)	$	145	$	84	$	(13	)	$	71

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

In millions	Amortization Expense (1)
2014	$	20
2015		18
2016		16
2017		15
2018		13

Schedule of Other Nonoperating Income (Expense) [Table Text Block]

In millions	2013		2012		2011
AFUDC - equity	$	12	$	6	$	4
Equity investment income		3		13		1
Other, net		1		5		2
Total other income	$	16	$	24	$	7

Schedule of Weighted Average Number of Shares [Table Text Block]

In millions (except per share amounts)	2013 (1)		2012 (1)		2011 (1)
Income from continuing operations (2)	$	290	$	259	$	165
Income from discontinued operations, net of tax		5		1		-
Net income attributable to AGL Resources Inc.	$	295	$	260	$	165
Denominator:
Basic weighted average number of shares outstanding (3)		117.9		117.0		80.4
Effect of dilutive securities		0.4		0.5		0.5
Diluted weighted average number of shares outstanding (4)		118.3		117.5		80.9
Basic earnings per share
Continuing operations	$	2.46	$	2.21	$	2.05
Discontinued operations		0.04		0.01		-
Basic earnings per common share attributable to AGL Resources Inc. common shareholders	$	2.50	$	2.22	$	2.05
Diluted earnings per share (3)
Continuing operations	$	2.45	$	2.20	$	2.04
Discontinued operations		0.04		0.01		-
Diluted earnings per common share attributable to AGL Resources Inc. common shareholders	$	2.49	$	2.21	$	2.04

Schedule of Business Acquisitions, by Acquisition [Table Text Block]

In millions
Current assets	$	3
PP&E		12
Goodwill		51
Intangible assets		62
Current liabilities		(6	)
Total purchase price	$	122

Depreciation [Member]

Note 2 - Significant Accounting Policies and Methods of Application (Tables) [Line Items]

Property, Plant and Equipment [Table Text Block]

	2013			2012			2011
Atlanta Gas Light (1)		2.6	%		2.6	%		2.6	%
Chattanooga Gas (1)		2.5	%		2.5	%		2.5	%
Elizabethtown Gas (2)		2.4	%		2.4	%		2.5	%
Elkton Gas (2)		2.4	%		2.4	%		2.4	%
Florida City Gas (2)		3.8	%		3.9	%		3.9	%
Nicor Gas (2) (3)		3.1	%		4.1	%		4.1	%
Virginia Natural Gas (1)		2.5	%		2.5	%		2.5	%

Estimated Useful Lives [Member]

Note 2 - Significant Accounting Policies and Methods of Application (Tables) [Line Items]

Property, Plant and Equipment [Table Text Block]

In years	Estimated useful life
Transportation equipment		5 - 10
Storage caverns		40 - 60
Other		up to 40

Authorized AFUDC Rates [Member]

Note 2 - Significant Accounting Policies and Methods of Application (Tables) [Line Items]

Property, Plant and Equipment [Table Text Block]

	2013			2012			2011
Atlanta Gas Light		8.10	%		8.10	%		8.10	%
Nicor Gas (1)		0.31	%		0.36	%		0.18	%
Chattanooga Gas		7.41	%		7.41	%		7.41	%
Elizabethtown Gas (1)		0.41	%		0.51	%		0.53	%
AFUDC (in millions) (2)	$	18		$	8		$	6