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FINANCIAL INSTRUMENTS (Balance Sheets) (Details) - Long-term Debt - Fair Value Hedging - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Derivative [Line Items]    
Carrying Amount of Hedged Long-Term Debt $ 1,198 $ 1,125
Fair value basis adjustments attributable to hedged debt 11 (53)
Hedging adjustment on a discontinued relationship $ 28 $ 40