QUARTERLY OPERATIONS Quarterly Operations (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

The following table provides certain quarterly financial information for the periods presented:

	Quarters Ended
	March 31, 2018		June 30, 2018		September 30, 2018		December 31, 2018			Total
Operating revenues	$	149	$	134	$	137	$	154		$	574
Operating income	64		42		41		56			203
Net income	34		22		23		29			108
	Quarters Ended
	March 31, 2017		June 30, 2017		September 30, 2017		December 31, 2017			Total
Operating revenues	$	128	$	104	$	110	$	138		$	480
Operating income (loss) (1)	37		20		18		(341		)	(266		)
Net income (loss)	14		8		4		(71		)	(45		)