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FINANCIAL INSTRUMENTS (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Feb. 28, 2019
Dec. 31, 2018
Derivative [Line Items]          
Accumulated other comprehensive loss     $ (55)   $ (59)
Cash Flow Hedging          
Derivative [Line Items]          
Accumulated other comprehensive loss     (7)   $ (9)
Cash Flow Hedging | Scenario, Forecast          
Derivative [Line Items]          
Net amount of deferred gains and losses on cash flow hedges that is expected to be reclassified within the next 12 months   $ 1      
Cash Flow Hedging | Treasury Lock          
Derivative [Line Items]          
Notional amount       $ 250  
Gain (loss) on derivatives $ (1)        
Cash Flow Hedging | Forward-starting Interest Rate Swap Agreements          
Derivative [Line Items]          
Notional amount     $ 125    
Fair Value Hedging | One-Month LIBOR | Minimum          
Derivative [Line Items]          
Floating rate     2.20%    
Fair Value Hedging | One-Month LIBOR | Maximum          
Derivative [Line Items]          
Floating rate     3.00%