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

12 Months Ended

Dec. 31, 2014

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

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

In millions	2014		2013		2012
Retail operations	$	4	$	1	$	3
Wholesale services (1)		73		8		19
Midstream operations		-		-		1
Total	$	77	$	9	$	23

Property, Plant and Equipment [Table Text Block]

In millions	2014		2013
Transportation and distribution	$	9,105	$	8,371
Storage facilities		1,202		1,170
Other		919		854
Construction work in progress		326		543
Total PP&E, gross		11,552		10,938
Less accumulated depreciation		2,462		2,295
Total PP&E, net	$	9,090	$	8,643

Schedule of Goodwill [Table Text Block]

In millions	Distribution Operations		Retail Operations		Wholesale Services		Midstream Operations		Other		Consolidated
Goodwill - December 31, 2014 and 2013	$	1,640	$	173	$	-	$	14	$	-	$	1,827

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

	Weighted average amortization		December 31, 2014							December 31, 2013
In millions	period (in years)		Gross		Accumulated amortization			Net		Gross		Accumulated amortization			Net
Customer relationships		13	$	130	$	(42	)	$	88	$	130	$	(25	)	$	105
Trade names		13		45		(8	)		37		45		(5	)		40
Total			$	175	$	(50	)	$	125	$	175	$	(30	)	$	145

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

In millions	Amortization Expense
2015	$	17
2016		15
2017		14
2018		13
2019		11

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

In millions	2014		2013		2012
Equity investment income	$	8	$	3	$	13
AFUDC - equity		5		12		6
Other, net		1		1		5
Total other income	$	14	$	16	$	24

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

In millions (except per share amounts)	2014			2013		2012
Income from continuing operations attributable to AGL Resources Inc.	$	562		$	290	$	259
(Loss) income from discontinued operations, net of tax		(80	)		5		1
Net income attributable to AGL Resources Inc.	$	482		$	295	$	260
Denominator:
Basic weighted average number of common shares outstanding (1)		118.8			117.9		117.0
Effect of dilutive securities		0.4			0.4		0.5
Diluted weighted average number of common shares outstanding (2)		119.2			118.3		117.5
Basic earnings per common share
Continuing operations	$	4.73		$	2.46	$	2.21
Discontinued operations		(0.67	)		0.04		0.01
Basic earnings per common share attributable to AGL Resources Inc. common shareholders	$	4.06		$	2.50	$	2.22
Diluted earnings per common share (2)
Continuing operations	$	4.71		$	2.45	$	2.20
Discontinued operations		(0.67	)		0.04		0.01
Diluted earnings per common share attributable to AGL Resources Inc. common shareholders	$	4.04		$	2.49	$	2.21

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]

	2014			2013			2012
Atlanta Gas Light (1)		2.3	%		2.6	%		2.6	%
Chattanooga Gas (1)		2.5	%		2.5	%		2.5	%
Elizabethtown Gas (2)		2.5	%		2.4	%		2.4	%
Elkton Gas (2)		2.8	%		2.4	%		2.4	%
Florida City Gas (2)		3.9	%		3.8	%		3.9	%
Nicor Gas (2) (3)		3.1	%		3.1	%		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]

	2014			2013			2012
Atlanta Gas Light		8.10	%		8.10	%		8.10	%
Nicor Gas (1)		0.24	%		0.31	%		0.36	%
Chattanooga Gas		7.41	%		7.41	%		7.41	%
Elizabethtown Gas (1)		0.44	%		0.41	%		0.51	%
AFUDC (in millions) (2)	$	7		$	18		$	8