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Financial Instruments and Risk Management (Market risk - Terms of Derivative Financial Instruments Used to Economically Hedge Foreign Currency Risk) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Disclosure of detailed information about hedges [Line Items]    
Carrying amount $ 275 $ 270
Put options [Member] | Israeli Shekel/U.S Dollar [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount 5 4
Stated amount $ 525 $ 599
Average exchange rate 3.4 3.7
Put options [Member] | U.S Dollar/Euro [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount $ 0 $ 2
Stated amount $ 63 $ 41
Average exchange rate 1.2 1.1
Put options [Member] | U.S Dollar/British Pound [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount   $ (1)
Stated amount   $ 11
Average exchange rate   1.3
Put options [Member] | Euro/British Pound [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount   $ 0
Stated amount   $ 15
Average exchange rate   0.8
Put options [Member] | U.S Dollar/Japanese Yen [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount $ 0 $ 0
Stated amount $ 3 $ 3
Average exchange rate 115.5 107.7
Call options [Member] | Israeli Shekel/U.S Dollar [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount $ (1) $ (6)
Stated amount $ 525 $ 599
Average exchange rate 3.4 3.7
Call options [Member] | U.S Dollar/Euro [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount $ (2) $ 0
Stated amount $ 63 $ 41
Average exchange rate 1.2 1.1
Call options [Member] | U.S Dollar/British Pound [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount $ 0 $ 0
Stated amount $ 0 $ 11
Average exchange rate 0.000 1.3
Call options [Member] | Euro/British Pound [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount $ 0 $ 0
Stated amount $ 0 $ 15
Average exchange rate 0.000 0.8
Call options [Member] | U.S Dollar/Japanese Yen [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount $ 0 $ 0
Stated amount $ 3 $ 3
Average exchange rate 115.5 107.7
Swap contract [Member] | Israeli Shekel/U.S Dollar [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount $ 64 $ 3
Stated amount $ 489 $ 571
Average exchange rate 3.7 3.7
SWAP contracts from fixed interest to variable interest - EUR [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount $ (1)  
Stated amount 51  
SWAP contracts from fixed interest to variable interest - ILS [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount 64  
Stated amount 489  
SWAP contracts from fixed interest to variable interest - USD [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount (3) $ (6)
Stated amount 350 380
Cylinder instruments [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount  
Stated amount  
Forward contracts [Member] | Israeli Shekel/U.S Dollar [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount 2 0
Stated amount $ 430 $ 483
Average exchange rate 3.5 3.8
Forward contracts [Member] | U.S Dollar/Euro [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount $ (3) $ 4
Stated amount $ 320 $ 265
Average exchange rate 1.2 1.1
Forward contracts [Member] | U.S Dollar/British Pound [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount $ 0 $ 1
Stated amount $ 24 $ 84
Average exchange rate 1.3 1.3
Forward contracts [Member] | Euro/British Pound [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount $ 0  
Stated amount $ 20  
Average exchange rate 0.9  
Forward contracts [Member] | U.S Dollar/Chinese Yuan Renminbi [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount $ (1) $ 1
Stated amount $ 33 $ 30
Average exchange rate 6.7 6.8
Forward contracts [Member] | Other [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount $ 0 $ 0
Stated amount $ 33 $ 14
Average exchange rate 0.0 0.0