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LONG-TERM DEBT (Tables)
 12 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
Long-term debt obligations (in millions):
 20192018
Fixed-rate notes payable due through 2029$475  $642  
Variable-rate notes payable due through 20291,032  1,473  
Less debt issuance costs(8) (12) 
Total debt1,499  2,103  
Less current portion235  486  
Long-term debt, less current portion$1,264  $1,617  
Weighted-average fixed-interest rate3.3 %4.1 %
Weighted-average variable-interest rate2.9 %3.9 %
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
2020$235  
2021281  
2022243  
2023173  
2024153  
Thereafter420  
Total principal payments$1,505