Condensed Consolidated Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Operating revenues (includes revenue taxes of $112 for 2013, $86 for 2012 and $9 for 2011)	$ 4,209	[1]	$ 3,562	[1]	$ 2,305	[1]
Operating expenses
Cost of goods sold	2,110	[1]	1,583	[1]	1,085	[1]
Operation and maintenance	887	[1]	816	[1]	497	[1]
Depreciation and amortization	397	[1]	394	[1]	182	[1]
Nicor merger expenses			20	[1],[2]	57	[1],[2]
Taxes other than income taxes	187	[1]	159	[1]	57	[1]
Total operating expenses	3,581	[1]	2,972	[1]	1,878	[1]
Gain on disposition of assets	11	[1]
Operating income	639	[1]	590	[1]	427	[1]
Other income, net	16	[1]	24	[1]	7	[1]
Interest expenses, net	(170)		(183)		(134)
Total other expense	154		159		127
Income before income taxes	485		431		300
Income tax expenses	177		157		121
Income from continuing operations	308		274		179
Income from discontinued operations, net of tax	5		1
Net income	313		275		179
Less net income attributable to the noncontrolling interest	18		15		14
Net income attributable to AGL Resources Inc.	$ 295	[1]	$ 260	[1]	$ 165	[1]
Basic earnings per common share
Continuing operations (in Dollars per share)	$ 2.46	[1],[3]	$ 2.21	[1],[3]	$ 2.05	[1],[3]
Discontinued operations (in Dollars per share)	$ 0.04	[1],[3]	$ 0.01	[1],[3]		[1],[3]
Basic earnings per common share attributable to AGL Resources Inc. common shareholders (in Dollars per share)	$ 2.50	[1]	$ 2.22	[1]	$ 2.05	[1]
Diluted earnings per common share
Continuing operations (in Dollars per share)	$ 2.45	[1],[3],[4]	$ 2.20	[1],[3],[4]	$ 2.04	[1],[3],[4]
Discontinued operations (in Dollars per share)	$ 0.04	[1],[3],[4]	$ 0.01	[1],[3],[4]		[1],[3],[4]
Diluted earnings per common share attributable to AGL Resources Inc. common shareholders (in Dollars per share)	$ 2.49	[1],[4]	$ 2.21	[1],[4]	$ 2.04	[1],[4]
Cash dividends declared per common share (in Dollars per share)	$ 1.88		$ 1.74		$ 1.90
Weighted average number of common shares outstanding
Basic (in Shares)	117.9	[1],[4]	117.0	[1],[4]	80.4	[1],[4]
Diluted (in Shares)	118.3	[1],[5]	117.5	[1],[5]	80.9	[1],[5]

[1] Amounts revised to include prior period adjustments. See Note 15 for additional information.

[2] Transaction expenses associated with the Nicor merger are shown separately to better compare year-over-year results.

[3] Excludes net income attributable to the noncontrolling interest.

[4] Daily weighted average shares outstanding.

[5] There were no outstanding stock options excluded from the computation of diluted earnings per common share attributable to AGL Resources Inc. for any of the periods presented because their effect would have been anti-dilutive, as the exercise prices were greater than the average market price.