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Financial Instruments and Risk Management (Market Risk - Terms of Derivative Financial Instruments Used to Hedge Interest Risk) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
SWAP contracts from variable interest to fixed interest [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount (fair value) $ (13) $ (6)
Stated amount $ 150 $ 150
Maturity date (in years) 2024 2024
Interest rate range 2.47%-2.60% 2.47%-2.60%
SWAP contracts from fixed ILS interest to fixed USD interest [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount (fair value) $ 87 $ 57
Stated amount $ 701 $ 482
Maturity date (in years) 2034 2024
Interest rate range 2.40%-4.47% 2.45%-4.47%
SWAP contracts from varible GBP interest to fixed USD interest [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount (fair value) $ 5  
Stated amount $ 63  
Maturity date (in years) 18/05/2021  
Interest rate range 1-month libor  
SWAP contracts from variable USD interest to fixed EUR interest [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount (fair value) $ (41) $ (3)
Stated amount $ 324 $ 447
Maturity date (in years) 19/05/2021 19/02/2020
Interest rate range 1-month libor 1-month libor