CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
NET INCOME	$ 243	$ 190
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	125	118
Recognition, refund and collection of revenue accruals and deferrals — including accrued interest	60	8
Deferred income tax expense	140	215
Allowance for equity funds used during construction	(25)	(26)
Other	6	23
Changes in assets and liabilities, exclusive of changes shown separately:
Accounts receivable	(54)	(34)
Other current assets	20	(6)
Accounts payable	(3)	33
Accrued compensation	12	3
Accrued interest	8	(7)
Accrued taxes	(16)	(16)
Other current liabilities	8	(2)
Net estimated refund related to return on equity complaints	(115)	88
Other non-current assets and liabilities, net	(5)	0
Net cash provided by operating activities	404	587
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(554)	(571)
Contributions in aid of construction	20	10
Other	(10)	4
Net cash used in investing activities	(544)	(557)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of long-term debt	200	599
Borrowings under revolving credit agreements	807	790
Borrowings under term loan credit agreements	250	0
Net issuance of commercial paper, net of discount	82	39
Retirement of long-term debt	(50)	(139)
Repayments of revolving credit agreements	(984)	(873)
Repayment of term loan credit agreements	0	(361)
Dividends on common and restricted stock	0	(90)
Dividends to ITC Investment Holdings Inc.	(168)	0
Refundable deposits from generators for transmission network upgrades	12	29
Repayment of refundable deposits from generators for transmission network upgrades	(8)	(10)
Other	(1)	(19)
Net cash provided by (used in) financing activities	140	(35)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	0	(5)
CASH AND CASH EQUIVALENTS — Beginning of period	8	14
CASH AND CASH EQUIVALENTS — End of period	$ 8	$ 9