QUARTERLY OPERATIONS Quarterly Operations (Tables)

12 Months Ended

Dec. 31, 2020

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, 2020		June 30, 2020		September 30, 2020		December 31, 2020		Total
Operating revenues	$	144	$	126	$	132	$	145	$	547
Operating income	58		52		55		52		217
Net income	40		43		44		44		171
	Quarters Ended
	March 31, 2019		June 30, 2019		September 30, 2019		December 31, 2019		Total
Operating revenues	$	158	$	139	$	135	$	146	$	578
Operating income	76		52		41		62		231
Net income	50		31		475		33		589