CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
NET INCOME	$ 161	$ 139
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	83	78
Recognition, refund and collection of revenue accruals and deferrals — including accrued interest	(7)	(18)
Deferred income tax expense	94	204
Allowance for equity funds used during construction	(16)	(16)
Other	3	15
Changes in assets and liabilities, exclusive of changes shown separately:
Accounts receivable	(47)	(41)
Income tax receivable	3	(145)
Other current assets	12	(7)
Accounts payable	1	17
Accrued compensation	6	(3)
Accrued interest	1	1
Accrued taxes	3	4
Other current liabilities	5	(2)
Net estimated refund related to return on equity complaints	(116)	29
Other non-current assets and liabilities, net	(6)	2
Net cash provided by operating activities	180	257
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(383)	(398)
Contributions in aid of construction	6	6
Other	(11)	4
Net cash used in investing activities	(388)	(388)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of long-term debt	200	200
Borrowings under revolving credit agreements	510	461
Borrowings under term loan credit agreements	250	0
Net issuance of commercial paper, net of discount	14	216
Repayments of revolving credit agreements	(689)	(509)
Repayment of term loan credit agreements	0	(200)
Issuance of common stock	0	11
Dividends on common and restricted stock	0	(57)
Dividends to ITC Investment Holdings Inc.	(78)	0
Refundable deposits from generators for transmission network upgrades	10	12
Repayment of refundable deposits from generators for transmission network upgrades	(8)	(9)
Other	(2)	(2)
Net cash provided by financing activities	207	123
NET DECREASE IN CASH AND CASH EQUIVALENTS	(1)	(8)
CASH AND CASH EQUIVALENTS — Beginning of period	8	14
CASH AND CASH EQUIVALENTS — End of period	$ 7	$ 6