SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT Condensed Statements of Financial Position (Parent Company Only) (Details) - USD ($) $ / shares in Units, $ in Thousands		Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Current assets
Cash and cash equivalents		$ 13,859	$ 27,741		$ 34,275		$ 26,187
Prepaid and other current assets		10,608	7,281
Total current assets		169,242	172,305
Other assets
Deferred financing fees (net of accumulated amortization of $6,670 and $4,700, respectively)		29,298	30,311
Other		44,802	37,418
Total other assets		1,303,241	1,290,398
TOTAL ASSETS	[1]	7,582,122	6,959,578	[2]	6,265,018	[2]
Current liabilities
Accounts payable		124,331	107,969
Accrued payroll		24,123	23,502
Accrued interest		52,577	50,538
Debt maturing within one year		395,334	175,000
Other		31,034	14,043
Total current liabilities		719,153	463,014
Accrued pension and postretirement liabilities		61,609	69,562
Other		23,075	17,354
Long-term debt (net of discounts of $3,404 and $3,940, respectively)		4,060,923	3,928,586
STOCKHOLDERS’ EQUITY
Common stock, without par value, 300,000,000 shares authorized, 152,699,077 and 155,140,967 shares issued and outstanding at December 31, 2015 and 2014, respectively		829,211	923,191
Retained earnings		875,595	741,550
Accumulated other comprehensive income		4,265	4,816		6,327		(18,048)
Total stockholders’ equity		1,709,071	1,669,557
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY		7,582,122	6,959,578
Balance Sheet Additional Disclosures
Deferred financing fees, accumulated amortization		$ 17,515	$ 15,972
Common stock, without par value		$ 0	$ 0
Common stock, shares authorized		300,000,000	300,000,000
Common stock, shares issued		152,699,077	155,140,967
Common stock, shares outstanding		152,699,077	155,140,967
ITC Holdings Corp.
Current assets
Cash and cash equivalents		$ 8,185	$ 6,305		$ 26,853		$ 22,546
Accounts receivable from subsidiaries		38,010	42,665
Prepaid and other current assets		1,674	1,655
Total current assets		47,869	50,625
Other assets
Investment in subsidiaries		4,010,767	3,784,609
Deferred income taxes		21,241	25,887
Deferred financing fees (net of accumulated amortization of $6,670 and $4,700, respectively)		12,322	14,117
Other		64,098	67,376
Total other assets		4,108,428	3,891,989
TOTAL ASSETS		4,156,297	3,942,614
Current liabilities
Accounts payable		3,421	2,431
Accrued payroll		24,123	23,502
Accrued interest		34,836	34,815
Debt maturing within one year		395,334	0
Other		7,084	4,266
Total current liabilities		464,798	65,014
Accrued pension and postretirement liabilities		61,609	69,562
Other		1,186	3,237
Long-term debt (net of discounts of $3,404 and $3,940, respectively)		1,919,633	2,135,244
STOCKHOLDERS’ EQUITY
Common stock, without par value, 300,000,000 shares authorized, 152,699,077 and 155,140,967 shares issued and outstanding at December 31, 2015 and 2014, respectively		829,211	923,191
Retained earnings		875,595	741,550
Accumulated other comprehensive income		4,265	4,816
Total stockholders’ equity		1,709,071	1,669,557
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY		4,156,297	3,942,614
Balance Sheet Additional Disclosures
Deferred financing fees, accumulated amortization		6,670	4,700
Unamortized discount		$ 3,404	$ 3,940
Common stock, without par value		$ 0	$ 0
Common stock, shares authorized		300,000,000	300,000,000
Common stock, shares issued		152,699,077	155,140,967
Common stock, shares outstanding		152,699,077	155,140,967

[1] Reconciliation of total assets results primarily from differences in the netting of deferred tax assets and liabilities at our Regulated Operating Subsidiaries as compared to the classification in our consolidated statements of financial position.

[2] Amounts reflect the change in the authoritative guidance on the presentation of deferred income taxes on the balance sheet. Refer to Notes 3 and 10 for more information.