Note 9 - Equity (Tables)

12 Months Ended

Dec. 31, 2014

Stockholders' Equity Note [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

In millions (1)	Cash flow hedges			Retirement benefit plans			Total
Balance as of December 31, 2011	$	(7	)	$	(210	)	$	(217	)
Other comprehensive income (loss)		4			(5	)		(1	)
Balance as of December 31, 2012		(3	)		(215	)		(218	)
Other comprehensive income, before reclassifications		1			66			67
Amounts reclassified from accumulated other comprehensive loss		3			12			15
Balance as of December 31, 2013		1			(137	)		(136	)
Other comprehensive loss, before reclassifications		(6	)		(71	)		(77	)
Amounts reclassified from accumulated other comprehensive loss		(1	)		8			7
Balance as of December 31, 2014	$	(6	)	$	(200	)	$	(206	)

Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]

	December 31,
In millions (1)	2014			2013
Cash flow hedges
Cost of goods sold (natural gas contracts)	$	4		$	(1	)
Operation and maintenance expense (natural gas contracts)		1			-
Interest expense (interest rate contracts)		-			(3	)
Total before income tax		5			(4	)
Income tax (expense)/benefit		(2	)		1
Cash flow hedges net of income tax		3			(3	)
Less noncontrolling interest		2			-
Total cash flow hedges net of income tax		1			(3	)
Retirement benefit plans
Operation and maintenance expense (actuarial losses)(2)		(15	)		(25	)
Operation and maintenance expense (prior service credits) (2)		2			5
Total before income tax		(13	)		(20	)
Income tax benefit		5			8
Total retirement benefit plans		(8	)		(12	)
Total reclassification	$	(7	)	$	(15	)