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Financial Derivative Instruments (Information) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Financial Derivative Instruments [Line Items]    
Current derivative financial assets $ 11 $ 13
Noncurrent derivative financial assets 57 15
Current derivative financial liabilities (8) (21)
Derivative instruments on energy and marine transport [Member]    
Financial Derivative Instruments [Line Items]    
Current derivative financial assets 1 0
Current derivative financial liabilities (3) (5)
Foreign currency and interest derivative instruments [Member]    
Financial Derivative Instruments [Line Items]    
Current derivative financial assets 10 13
Noncurrent derivative financial assets 57 15
Current derivative financial liabilities (5) (16)
Noncurrent derivative financial liabilities $ (6) $ 0