CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDER'S EQUITY CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDER'S EQUITY (UNAUDITED) - USD ($) $ in Millions	Total	Common Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]
Stockholders' Equity Attributable to Parent	$ 2,051	$ 892	$ 1,155	$ 4
NET INCOME	84		84
Dividends to ITC Investment Holdings Inc.	(72)		(72)
NET INCOME	171
Dividends to ITC Investment Holdings Inc.	(145)
Total other comprehensive (loss) income, net of tax	1
Revenues	627
Transmission and other services	577
Formula rate true-up	50
Operation and maintenance	57
General and administrative	76
Depreciation and amortization	98
Total operating expenses	290
Operating Income (Loss)	337
Interest expense, net	123
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity	(16)
Other Nonoperating Income (Expense)	(1)
Nonoperating Income (Expense)	106
INCOME TAX PROVISION	60
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	1
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	172
Taxes other than income taxes	59
Income before income taxes	231
Stockholders' Equity Attributable to Parent	2,063	892	1,167	4
NET INCOME	87		87
Dividends to ITC Investment Holdings Inc.	(73)		(73)
Total other comprehensive (loss) income, net of tax	1			1
Revenues	320
Transmission and other services	288
Formula rate true-up	32
Operation and maintenance	32
General and administrative	38
Depreciation and amortization	51
Total operating expenses	149
Operating Income (Loss)	171
Interest expense, net	64
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity	(8)
Other Nonoperating Income (Expense)	(1)
Nonoperating Income (Expense)	55
INCOME TAX PROVISION	29
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	1
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	88
Taxes other than income taxes	28
Income before income taxes	116
Stockholders' Equity Attributable to Parent	2,078	892	1,181	5
Stockholders' Equity Attributable to Parent	2,232	892	1,333	7
NET INCOME	92		92
Dividends to ITC Investment Holdings Inc.	(82)		82
Total other comprehensive (loss) income, net of tax	(16)			(16)
NET INCOME	213
Dividends to ITC Investment Holdings Inc.	(165)
Total other comprehensive (loss) income, net of tax	(17)
Revenues	664
Transmission and other services	630
Formula rate true-up	34
Operation and maintenance	47
General and administrative	59
Depreciation and amortization	108
Total operating expenses	276
Operating Income (Loss)	388
Interest expense, net	116
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity	(12)
Other Nonoperating Income (Expense)	(1)
Nonoperating Income (Expense)	103
INCOME TAX PROVISION	72
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(17)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	196
Taxes other than income taxes	62
Income before income taxes	285
Stockholders' Equity Attributable to Parent	2,226	892	1,343	(9)
NET INCOME	121		121
Dividends to ITC Investment Holdings Inc.	(83)		83
Total other comprehensive (loss) income, net of tax	(1)			(1)
Revenues	342
Transmission and other services	341
Formula rate true-up	1
Operation and maintenance	20
General and administrative	28
Depreciation and amortization	54
Total operating expenses	133
Operating Income (Loss)	209
Interest expense, net	57
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity	(6)
Other Nonoperating Income (Expense)	(3)
Nonoperating Income (Expense)	48
INCOME TAX PROVISION	40
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(1)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	120
Taxes other than income taxes	31
Income before income taxes	161
Stockholders' Equity Attributable to Parent	$ 2,263	$ 892	$ 1,381	$ (10)