Note 5 - Derivative Instruments (Tables)

6 Months Ended

Jun. 30, 2012

	Three months ended June 30,				Six months ended June 30,
In millions	2012		2011		2012		2011
Nicor Gas	$	25		n/a	$	26		n/a
Elizabethtown Gas		7		5		16		13

Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]

In Bcf	June 30, 2012 (1) (2)			December 31, 2011 (2)			June 30, 2011
Hedge designation:
Cash flow		7			5			1
Not designated		47			186			191
Total		54			191			192
Hedge position:
Short		(2,018	)		(1,680	)		(1,559	)
Long		2,072			1,871			1,751
Net long position		54			191			192

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

In millions	Unaudited Condensed Consolidated Statements of Financial Position Location (1) (2)	June 30, 2012			December 31, 2011			June 30, 2011
Designated as cash flow and fair value hedges
Asset Instruments
Current natural gas contracts	Derivative instruments assets and liabilities – current portion	$	6		$	9		$	1
Interest rate swap agreements	Derivative instruments assets – long-term portion		17			13			3
Liability Instruments
Current natural gas contracts	Derivative instruments assets and liabilities – current portion		(7	)		(12	)		(2	)
Interest rate swap agreements	Derivative instruments liabilities – long-term portion		0			(13	)		0
Total			16			(3	)		2
Not designated as cash flow hedges
Asset Instruments
Current natural gas contracts	Derivative instruments assets and liabilities – current portion		493			706			286
Noncurrent natural gas contracts	Derivative instruments assets and liabilities		69			133			69
Liability Instruments
Current natural gas contracts	Derivative instruments assets and liabilities – current portion		(489	)		(689	)		(263	)
Noncurrent natural gas contracts	Derivative instruments assets and liabilities		(66	)		(116	)		(60	)
Total			7			34			32
Total derivative instruments		$	23		$	31		$	34

Schedule of Derivative Instruments [Table Text Block]

	For the three months ended June 30,						For the six months ended June 30,
In millions	2012			2011			2012			2011
Designated as cash flow hedges
Natural gas contracts – gain (loss) reclassified from OCI into cost of goods sold for settlement of hedged item	$	3		$	(1	)	$	4		$	(1	)
Natural gas contracts – gain (loss) reclassified from OCI into operation and maintenance for settlement of hedged item		1			0			1			0
Natural gas contracts – loss recognized in OCI (effective portion)		(1	)		0			0			0
Interest rate swaps – loss recognized in OCI		(1	)		0			(3	)		0
Not designated as hedges
Natural gas contracts – net gain fair value adjustments recorded in operating revenues (1)		15			10			19			16
Natural gas contracts – net loss fair value adjustments recorded in cost of goods sold (2)		(1	)		0			(3	)		(1	)
Total gains (losses) on derivative instruments	$	16		$	9		$	18		$	14