Note 11 - Commitments, Guarantees and Contingencies (Tables)

12 Months Ended

Dec. 31, 2012

Environmental Exit Costs by Cost [Table Text Block]

In millions	Probabilistic model cost estimates					Engineering estimates		Amount recorded		Expected costs over next twelve months
Illinois	$	193	-	$	439	$	50	$	243	$	32
New Jersey		116	-		203		6		122		13
Georgia and Florida		53	-		106		12		68		4
North Carolina			n/a				11		11		8
Total	$	362	-	$	748	$	79	$	444	$	57

Recorded Contractual Obligations [Member]

Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block]

													2018 &
In millions	Total		2013		2014		2015		2016		2017		thereafter
Recorded contractual obligations:
Long-term debt (1)	$	3,432	$	226	$	0	$	200	$	545	$	22	$	2,439
Short-term debt		1,377		1,377		0		0		0		0		0
Pipeline replacement program costs (2)		121		121		0		0		0		0		0
Environmental remediation liabilities (2)		444		57		62		77		56		40		152
Total	$	5,374	$	1,781	$	62	$	277	$	601	$	62	$	2,591

Unrecorded Contractual Obligations [Member]

Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block]

Unrecorded contractual obligations and commitments(3) (8) (9):
Pipeline charges, storage capacity and gas supply (4)	$	2,233	$	762	$	470	$	307	$	138	$	92	$	464
Interest charges (5)		2,430		166		163		153		140		126		1,682
Operating leases (6)		210		32		25		23		21		19		90
Asset management agreements (7)		31		12		8		5		4		2		0
Standby letters of credit, performance / surety bonds (8)		35		29		6		0		0		0		0
Other		8		2		2		2		2		0		0
Total	$	4,947	$	1,003	$	674	$	490	$	305	$	239	$	2,236