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LONG-TERM DEBT - Amounts of Long-Term Debt Due Annually for the Next Five Years and the Total Amount Due After 2022 (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Long-term debt maturities  
2018 $ 62
2019 500
2020 0
2021 719
2022 0
Thereafter $ 4,675