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Derivative Instruments (Information) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Derivative Instruments [Line Items]    
Current derivative financial assets $ 13 $ 5
Noncurrent derivative financial assets 15 64
Current derivative financial liabilities (21) (3)
Derivative instruments on energy and marine transport [Member]    
Derivative Instruments [Line Items]    
Current derivative financial assets 0 4
Current derivative financial liabilities (5) 0
Foreign currency and interest derivative instruments [Member]    
Derivative Instruments [Line Items]    
Current derivative financial assets 13 1
Noncurrent derivative financial assets 15 64
Current derivative financial liabilities (16) (3)
Noncurrent derivative financial liabilities $ 0 $ (3)