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LONG-TERM DEBT (Tables)
9 Months Ended
Sep. 30, 2017
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Long-term debt obligations on the consolidated balance sheet (in millions):
 
September 30, 2017
 
December 31, 2016
Fixed-rate notes payable due through 2028
$
1,024

 
$
1,179

Variable-rate notes payable due through 2028
1,693

 
1,803

Less debt issuance costs
(16
)
 
(18
)
Total debt
2,701

 
2,964

Less current portion
334

 
319

Long-term debt, less current portion
$
2,367

 
$
2,645

 
 
 
 
Weighted-average fixed-interest rate
4.3
%
 
4.4
%
Weighted-average variable-interest rate
2.6
%
 
2.4
%
Schedule of Maturities of Long-term Debt
At September 30, 2017, long-term debt principal payments for the next five years and thereafter are as follows (in millions):
 
Total
Remainder of 2017
$
55

2018
350

2019
422

2020
449

2021
422

Thereafter
1,016

Total
$
2,714