Condensed Consolidated Statements of Income (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Operating revenues (includes revenue taxes of $8 and $82 for the three and nine months in 2013 and $8 and $63 for the three and nine months in 2012)	$ 675		$ 614		$ 3,288		$ 2,704
Operating expenses
Cost of goods sold	229		215		1,609		1,174
Operation and maintenance	226		212		718		675
Depreciation and amortization	109		104		325		310
Taxes other than income taxes	29		27		144		123
Nicor merger expenses			2	[1]			15	[1]
Total operating expenses	593		560		2,796		2,297
Gain on sale of Compass Energy					11
Operating income	82		54		503		407
Other income	7		6		19		19
Interest expense, net	(43)		(45)		(135)		(137)
Earnings before income taxes	46		15		387		289
Income tax expense	18		6		145		106
Net income	28		9		242		183
Less net income attributable to the noncontrolling interest					11		10
Net income attributable to AGL Resources Inc.	$ 28		$ 9		$ 231		$ 173
Per common share data
Basic earnings per common share attributable to AGL Resources Inc. common shareholders (in Dollars per share)	$ 0.24		$ 0.08		$ 1.96		$ 1.48
Diluted earnings per common share attributable to AGL Resources Inc. common shareholders (in Dollars per share)	$ 0.24		$ 0.08		$ 1.96		$ 1.48
Cash dividends declared per common share (in Dollars per share)	$ 0.47		$ 0.46		$ 1.41		$ 1.28
Weighted average number of common shares outstanding
Basic (in Shares)	118.2	[2]	117.1	[2]	117.8	[2]	116.9	[2]
Diluted (in Shares)	118.5		117.5		118.1		117.3

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

[2] Daily weighted average shares outstanding.