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FINANCIAL INSTRUMENTS (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Feb. 28, 2019
Dec. 31, 2018
Derivative [Line Items]          
Accumulated net loss from designated or qualifying cash flow hedges     $ (39)   $ (59)
Cash Flow Hedging          
Derivative [Line Items]          
Accumulated net loss from designated or qualifying cash flow hedges     (4)   (9)
Cash Flow Hedging | 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   $ 2      
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     400    
Gain (loss) on derivatives     6    
Fair Value Hedging          
Derivative [Line Items]          
Notional amount     1,200   1,200
Fair Value Hedging | Long-term Debt          
Derivative [Line Items]          
Hedged liability, cumulative increase (decrease)     $ 25   $ 40
Fair Value Hedging | LIBOR | Minimum          
Derivative [Line Items]          
Interest rate spread     2.20%    
Fair Value Hedging | LIBOR | Maximum          
Derivative [Line Items]          
Interest rate spread     3.00%