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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, 2017
Dec. 31, 2016
Disclosure of detailed information about hedges [Line Items]    
Carrying amount (fair value) $ 275 $ 270
SWAP contracts from fixed interest to variable interest - EUR [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount (fair value) (1)  
Stated amount $ 51  
Maturity date (in years) 0-1  
Interest rate range 1-month Libor  
SWAP contracts from fixed interest to variable interest - ILS [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount (fair value) $ 64  
Stated amount $ 489  
Maturity date (in years) 0-4  
Interest rate range 2.45% - 4.74%  
SWAP contracts from fixed interest to variable interest - USD [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount (fair value) $ (3) (6)
Stated amount $ 350 $ 380
Maturity date (in years) 0-7 0-4
Interest rate range 1.36% - 2.6% 1.4%-3.2%
Cylinder instruments [Member]    
Disclosure of detailed information about hedges [Line Items]    
Carrying amount (fair value)  
Stated amount  
Maturity date (in years)  
Interest rate range