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Derivative Instruments (Information) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments [Line Items]    
Current derivative financial assets $ 5 $ 12
Noncurrent derivative financial assets 64 3
Current derivative financial liabilities (3) (3)
Derivative instruments on energy and marine transport [Member]    
Derivative Instruments [Line Items]    
Current derivative financial assets 4 4
Current derivative financial liabilities 0 0
Foreign currency and interest derivative instruments [Member]    
Derivative Instruments [Line Items]    
Current derivative financial assets 1 8
Noncurrent derivative financial assets 64 3
Current derivative financial liabilities (3) (3)
Noncurrent derivative financial liabilities $ (3) $ (5)