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DEBT - Maturities (Details)
$ in Billions
Dec. 31, 2018
USD ($)
Debt Disclosure [Abstract]  
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months $ 0.0
Long-term Debt, Maturities, Repayments of Principal in Year Two 1.0
Long-term Debt, Maturities, Repayments of Principal in Year Three 1.1
Long-term Debt, Maturities, Repayments of Principal in Year Four 2.4
Long-term Debt, Maturities, Repayments of Principal in Year Five 2.7
Long-term Debt, Maturities, Repayments of Principal after Year Five $ 3.9