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Derivative Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Derivative [Line Items]        
Cash flow hedge gain/(loss) to be reclassified during the next 12 months, pre-tax     $ (22)  
Fair value of foreign exchange and commodity contracts that have credit-risk-related contingent features that are in a net liability position $ 28   28  
Foreign Exchange Contract [Member]        
Derivative [Line Items]        
Derivative, Gain (Loss) on Derivative, Net $ 0 $ (4) $ 2 $ (1)
Gain from Components Excluded from Assessment of Cash Flow Hedge Effectiveness       $ 5
Loss from Components Excluded from Assessment of Cash Flow Hedge Effectiveness   $ (1)