Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS AND RISK MANAGEMENT - Fair Value Derivative Balance Sheet Location (Details)

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DERIVATIVE INSTRUMENTS AND RISK MANAGEMENT - Fair Value Derivative Balance Sheet Location (Details) - Designated as Hedging Instrument - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Current maturities of long-term debt, commercial paper and finance leases | Carrying Amount    
Derivatives, Fair Value [Line Items]    
Liability Derivatives $ 1,000 $ 0
Current maturities of long-term debt, commercial paper and finance leases | Fair Value    
Derivatives, Fair Value [Line Items]    
Liability Derivatives 0 0
Long-term debt and finance leases | Carrying Amount    
Derivatives, Fair Value [Line Items]    
Liability Derivatives 3,218 4,207
Long-term debt and finance leases | Fair Value    
Derivatives, Fair Value [Line Items]    
Liability Derivatives $ 27 $ 16