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FINANCIAL INSTRUMENTS - Estimated Fair Values of Instruments Not Carried at Fair Value in Balance Sheets (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Carrying Amount    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivables $ 19,734 $ 19,167
Debt 24,369 24,445
Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivables 19,577 19,017
Debt $ 24,653 $ 24,481