Condensed Consolidated Statements of Income (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Operating revenues (includes revenue taxes of $26 and $94 for the three and six months in 2014 and $24 and $74 for the three and six months in 2013)	$ 889	[1]	$ 805	[1]	$ 3,351	[1]	$ 2,417	[1]
Operating expenses
Cost of goods sold	402	[1]	353	[1]	1,802	[1]	1,273	[1]
Operation and maintenance	211	[1]	204	[1]	500	[1]	435	[1]
Depreciation and amortization	95	[1]	103	[1]	188	[1]	205	[1]
Taxes other than income taxes	42	[1]	43	[1]	130	[1]	112	[1]
Total operating expenses	750	[1]	703	[1]	2,620	[1]	2,025	[1]
Gain on disposition of assets			11	[1]			11	[1]
Operating income	139	[1]	113	[1]	731	[1]	403	[1]
Other income	2	[1]	6	[1]	5	[1]	11	[1]
Interest expense, net	(45)		(44)		(91)		(89)
Income before income taxes	96		75		645		325
Income tax expense	37		30		240		121
Income from continuing operations	59		45		405		204
Income (loss) from discontinued operations, net of tax	1		(1)		(49)
Net income	60		44		356		204
Less net income attributable to the noncontrolling interest	2		1		14		11
Net income attributable to AGL Resources Inc.	$ 58		$ 43		$ 342		$ 193
Basic earnings (loss) per common share
Continuing operations (in Dollars per share)	$ 0.48	[2]	$ 0.38	[2]	$ 3.30	[2]	$ 1.65	[2]
Discontinued operations (in Dollars per share)	$ 0.01	[2]	$ (0.01)	[2]	$ (0.42)	[2]		[2]
Basic earnings per common share attributable to AGL Resources Inc. common shareholders (in Dollars per share)	$ 0.49		$ 0.37		$ 2.88		$ 1.65
Diluted earnings (loss) per common share
Continuing operations (in Dollars per share)	$ 0.48	[2]	$ 0.38	[2]	$ 3.29	[2]	$ 1.64	[2]
Discontinued operations (in Dollars per share)	$ 0.01	[2]	$ (0.01)	[2]	$ (0.42)	[2]		[2]
Diluted earnings per common share attributable to AGL Resources Inc. common shareholders (in Dollars per share)	$ 0.49		$ 0.37		$ 2.87		$ 1.64
Cash dividends declared per common share (in Dollars per share)	$ 0.49		$ 0.47		$ 0.98		$ 0.94
Weighted average number of common shares outstanding
Basic (in Shares)	118.8		117.8		118.7		117.6
Diluted (in Shares)	119.2		118.2		119.1		117.9

[1] Amounts revised to include prior period adjustments. See Note 13 for additional information.

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