QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)

12 Months Ended

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Schedule of quarterly financial information

Accordingly, comparisons among quarters of a year may not represent overall trends and changes in operations.

	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
(in millions)	2019
Operating Revenue	$	333	$	326	$	441	$	318
Operating Income	43		67		134		39
Net Income	26		42		98		21
	2018
Operating Revenue	$	275	$	354	$	460	$	344
Operating Income	43		83		126		36
Net Income	24		58		95		11