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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, 2018
Dec. 31, 2017
SWAP contracts from variable interest to fixed interest [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount (fair value) $ 0 $ (3)
Stated amount $ 250 $ 350
Maturity date (in years) 2019-2024 2018-2024
Interest rate range 1.7%-2.6% 1.36% - 2.6%
SWAP contracts from variable USD interest to fixed EUR interest [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount (fair value) $ (1) $ (1)
Stated amount $ 334 $ 51
Maturity date (in years) 15/2/2019 15/8/2018
Interest rate range 1-month Libor 1-month Libor
SWAP contracts from fixed ILS interest to fixed USD interest [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount (fair value) $ 15 $ 64
Stated amount $ 486 $ 489
Maturity date (in years) 30/3/2024 1/3/2024
Interest rate range 2.45%-4.74% 2.45% - 4.74%