CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Document Fiscal Year Focus	2020
CASH FLOWS FROM OPERATING ACTIVITIES
NET INCOME	$ 213,000,000	$ 171,000,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	108,000,000	98,000,000
Recognition, refund and collection of revenue accruals and deferrals — including accrued interest	(53,000,000)	(56,000,000)
Deferred income tax expense	74,000,000	59,000,000
Allowance for equity funds used during construction	(12,000,000)	(16,000,000)
Employee Benefits and Share-based Compensation	10,000,000	15,000,000
Other	3,000,000	4,000,000
Changes in assets and liabilities, exclusive of changes shown separately:
Accounts receivable	(27,000,000)	(28,000,000)
Accrued compensation	(19,000,000)	0
Accrued interest	3,000,000	9,000,000
Accrued taxes	2,000,000	3,000,000
Other current and non-current assets and liabilities, net	(14,000,000)	(3,000,000)
Net cash provided by operating activities	240,000,000	261,000,000
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(353,000,000)	(403,000,000)
Contributions in aid of construction	2,000,000	1,000,000
Other	1,000,000	1,000,000
Net cash used in investing activities	(350,000,000)	(401,000,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of long-term debt	700,000,000	50,000,000
Borrowings under revolving credit agreements	931,000,000	501,000,000
Borrowings under term loan credit agreements	275,000,000	200,000,000
Net (repayment) issuance of commercial paper	(200,000,000)	184,000,000
Repayments of revolving credit agreements	(929,000,000)	(451,000,000)
Dividends to ITC Investment Holdings Inc.	(165,000,000)	(145,000,000)
Other	(3,000,000)	(1,000,000)
Net cash provided by financing activities	186,000,000	135,000,000
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	76,000,000	(5,000,000)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — Beginning of period	6,000,000	10,000,000
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — End of period	82,000,000	5,000,000
Increase (Decrease) in Accounts Payable	6,000,000	1,000,000
Gain (Loss) on Sale of Derivatives	(23,000,000)	0
Estimated Refund Related to Return on Equity Complaint	(54,000,000)	4,000,000
Proceeds from (Repayments of) Debt, Maturing in More than Three Months	0	(203,000,000)
Proceeds from (Repayments of) Other Debt	$ (400,000,000)	$ 0