CONSOLIDATED STATEMENTS OF OPERATIONS $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares
Transmission revenues, net (Note 6)	$ 399	$ 403	$ 549
Equity earnings (Note 5)	170	160	173
Impairment of long-lived assets (Note 7)	0	0	(537)
Impairment of goodwill (Note 4)	0	0	(59)
Operation and maintenance expenses	(64)	(71)	(67)
Property taxes	(26)	(26)	(28)
General and administrative	(10)	(8)	(6)
Depreciation	(89)	(78)	(97)
Financial charges and other (Note 12)	(73)	(83)	(92)
Net income (loss) before taxes	307	297	(164)
Income taxes (Note 2)	(6)	1	(1)
Net Income (loss)	301	298	(165)
Net income attributable to non-controlling interests	17	18	17
Net income (loss)	284	280	(182)
Net income (loss) attributable to controlling interest allocation (Note 13)
Common units	278	267	(191)
General Partner	6	5	(4)
Class B units	0	8	13
Net income (loss) attributable to controlling interests	$ 284	$ 280	$ (182)
Net income (loss) per common unit - basic and diluted (in dollars per unit) | $ / shares	$ 3.90	$ 3.74	$ (2.68)
Weighted average common units outstanding – basic and diluted (in units) | shares	71,300,000	71,300,000	71,300,000
Common units
Net income (loss) attributable to controlling interest allocation (Note 13)
Common units	$ 278	$ 267	$ (191)
Net income (loss) per common unit - basic and diluted (in dollars per unit) | $ / shares	$ 3.90	$ 3.74	$ (2.68)
Weighted average common units outstanding – basic and diluted (in units) | shares	71,300,000	71,300,000	71,300,000
Common units outstanding, end of year (in units) | shares	71,300,000	71,300,000	71,300,000