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CONSOLIDATED DEBT (Tables)
 3 Months Ended
Mar. 31, 2018
Debt Disclosure [Abstract]  
Schedule of Consolidated Debt Consolidated debt is as follows (in millions)
 
 
March 31, 2018
 
December 31, 2017
LONG-TERM DEBT:
 
 
 
 
Revolving credit facility (4.13% - 4.38%)
 
$
387

 
$
445

Term loan, net (3.62%)
 
190

 
191

Credit Facilities subtotal
 
577

 
636

Senior Notes, net of deferred financing costs
 
1,185

 
1,185

Tax-Exempt Bonds, net of deferred financing costs
 
459

 
459

Equipment financing capital leases
 
68

 
69

Total long-term debt
 
$
2,289

 
$
2,349

Less: current portion
 
(10
)
 
(10
)
Noncurrent long-term debt
 
$
2,279

 
$
2,339

PROJECT DEBT:
 
 
 
 
Total project debt, net of deferred financing costs and unamortized debt premium
 
$
165

 
$
174

Less: Current portion
 
(24
)
 
(23
)
Noncurrent project debt
 
$
141

 
$
151

TOTAL CONSOLIDATED DEBT
 
$
2,454

 
$
2,523

Less: Current debt
 
(34
)
 
(33
)
TOTAL NONCURRENT CONSOLIDATED DEBT
 
$
2,420

 
$
2,490
Revolving Credit Facility As of March 31, 2018, we had unutilized capacity under the Revolving Credit Facility as follows (in millions):
 
Total Facility Commitment
 
Expiring (1)
 
Direct Borrowings
 
Outstanding Letters of Credit as of
 
Unutilized Capacity
Revolving Credit Facility
$
1,000

 
2020
 
$
387

 
$
212

 
$
401

(1) The Revolving Credit Facility consists of two tranches; Tranche A ($950 million), which expires in 2020, and Tranche B ($50 million), which expires in March 2019.