LONG-TERM DEBT (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments [Table Text Block]

Long-term debt obligations (in millions):

	2017			2016
Fixed-rate notes payable due through 2028	$	959		$	1,179
Variable-rate notes payable due through 2028	1,625			1,803
Less debt issuance costs	(15		)	(18		)
Total debt	2,569			2,964
Less current portion	307			319
Long-term debt, less current portion	$	2,262		$	2,645
Weighted-average fixed-interest rate	4.2		%	4.4		%
Weighted-average variable-interest rate	2.8		%	2.4		%

Schedule of Maturities of Long-term Debt [Table Text Block]

Long-term debt principal payments for the next five years and thereafter (in millions):

	Total
2018	$	310
2019	393
2020	449
2021	414
2022	247
Thereafter	768
Total principal payments	$	2,581