Segment Information (Tables)

12 Months Ended

Dec. 31, 2011

Notes To Financial Statements [Abstract]

Reconciliations of EBIT to operating income, earnings before income taxes and net income [Table Text Block]

The reconciliations of EBIT to operating income, earnings before income taxes and net income for 2011, 2010 and 2009 are presented below.

In millions	2011	2010	2009
Operating income	$440	$500	$476
Other (expense) income	7	(1)	9
EBIT	447	499	485
Interest expense	136	109	101
Earnings before income taxes	311	390	384
Income taxes	125	140	135
Net income	$186	$250	$249

Segment Reporting Information Intersegment Revenue [Table Text Block]

Summarized Statements of Income, Statements of Financial Position and capital expenditure information by segment as of and for the years ended December 31, 2011, 2010 and 2009 are shown in the following tables. Please note that our segments have changed as a result of our merger with Nicor and amounts from the periods presented have been reclassified between the segments to reflect these changes.

2011

In millions	Distribution operations	Retail operations	Wholesale services	Midstream operations	Cargo shipping	Other and intercompany eliminations (4)	Consolidated
Operating revenues from external parties	$1,451	$702	$95	$70	$19	$1	$2,338
Intercompany revenues (1)	146	0	3	0	0	(149)	0
Total operating revenues	1,597	702	98	70	19	(148)	2,338
Operating expenses
Cost of goods sold	625	534	41	33	12	(148)	1,097
Operation and maintenance	362	71	48	15	7	(13)	490
Depreciation and amortization	160	2	1	10	1	12	186
Nicor merger expenses (2)	0	0	0	0	0	68	68
Taxes other than income taxes	44	2	3	3	0	5	57
Total operating expenses	1,191	609	93	61	20	(76)	1,898
Operating income (loss)	406	93	5	9	(1)	(72)	440
Other income	6	0	0	0	1	0	7
EBIT	$412	$93	$5	$9	$0	$(72)	$447
Identifiable and total assets (3)	$11,020	$501	$1,214	$635	$714	$(171)	$13,913
Goodwill	$1,586	$124	$2	$16	$77	$8	$1,813
Capital expenditures	$365	$2	$1	$35	$0	$24	$427

2010

In millions	Distributionoperations	Retail operations	Wholesale services	Midstream operations	Cargo shipping	Other and intercompany eliminations (4)	Consolidated
Operating revenues from external parties	$1,349	$840	$121	$46	$0	$17	$2,373
Intercompany revenues (1)	145	0	0	0	0	(145)	0
Total operating revenues	1,494	840	121	46	0	(128)	2,373
Operating expenses
Cost of goods sold	615	657	16	16	0	(140)	1,164
Operation and maintenance	358	76	52	17	0	(6)	497
Depreciation and amortization	138	2	2	5	0	13	160
Nicor merger expenses (2)	0	0	0	0	0	6	6
Taxes other than income taxes	35	2	3	2	0	4	46
Total operating expenses	1,146	737	73	40	0	(123)	1,873
Operating income (loss)	348	103	48	6	0	(5)	500
Other income (expense)	4	0	1	0	0	(6)	(1)
EBIT	$352	$103	$49	$6	$0	$(11)	$499
Identifiable and total assets (3)	$5,484	$259	$1,326	$471	$0	$(20)	$7,520
Goodwill	$404	$0	$0	$14	$0	$0	$418
Capital expenditures	$357	$3	$2	$126	$0	$22	$510

2009
In millions	Distribution operations	Retail operations	Wholesale services	Midstream operations	Cargo shipping	Other and intercompany eliminations (4)	Consolidated
Operating revenues from external parties	$1,348	$801	$121	$22	$0	$25	$2,317
Intercompany revenues (1)	138	0	0	0	0	(138)	0
Total operating revenues	1,486	801	121	22	0	(113)	2,317
Operating expenses
Cost of goods sold	646	620	10	0	0	(134)	1,142
Operation and maintenance	352	71	59	15	0	0	497
Depreciation and amortization	135	4	3	3	0	13	158
Nicor merger expenses (2)	0	0	0	0	0	0	0
Taxes other than income taxes	35	1	2	1	0	5	44
Total operating expenses	1,168	696	74	19	0	(116)	1,841
Operating income (loss)	318	105	47	3	0	3	476
Other income (expense)	9	0	0	0	0	0	9
EBIT	$327	$105	$47	$3	$0	$3	$485
Identifiable and total assets (3)	$5,222	$261	$1,168	$332	$0	$96	$7,079
Goodwill	$404	$0	$0	$14	$0	$0	$418
Capital expenditures	$354	$2	$1	$110	$0	$9	$476

(1)Intercompany revenues – wholesale services records its energy marketing and risk management revenues on a net basis and its total operating revenues include intercompany revenues of $449 million in 2011, $473 million in 2010 and $425 million in 2009.

(2)Non-recurring transaction expenses associated with the Nicor merger are shown separately to better compare year-over-year results.

(3)Identifiable assets are those used in each segment’s operations.

(4)Our other segment’s assets consist primarily of cash and cash equivalents, property, plant and equipment and the effect of intercompany eliminations.