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Derivative Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Derivative [Line Items]      
Cash flow hedge gain/(loss) to be reclassified during the next 12 months, pre-tax $ (44)    
Fair value of foreign exchange and commodity contracts that have credit-risk-related contingent features that are in a net liability position     $ 25
Foreign Exchange Contract [Member]      
Derivative [Line Items]      
Derivative, Gain (Loss) on Derivative, Net 2 $ 3  
Gain from Components Excluded from Assessment of Cash Flow Hedge Effectiveness $ 6