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Hedges and Derivative Financial Instruments (Schedule of Effects of Derivative Instruments on Consolidated Statements of Income) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI (Effective Portion) $ 77 $ (84) $ 106
Foreign exchange forwards/options      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized on Derivatives not Accounted for as Hedges 99 (40)  
Cash Flow Hedges and Net Investment Hedges      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI (Effective Portion) 100 (196)  
Gain (Loss) Reclassified from OCI into Income (Effective Portion) 107 (80)  
Cash Flow Hedges      
Derivative Instruments, Gain (Loss) [Line Items]      
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax 7 9  
Cash Flow Hedges | Foreign exchange forwards/options      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI (Effective Portion) 131 (178)  
Gain (Loss) Reclassified from OCI into Income (Effective Portion) 86 (122)  
Cash Flow Hedges | Commodity swaps/options      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI (Effective Portion) (51) 64  
Gain (Loss) Reclassified from OCI into Income (Effective Portion) 22 43  
Cash Flow Hedges | Interest rate derivatives      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI (Effective Portion) (3) 0  
Gain (Loss) Reclassified from OCI into Income (Effective Portion) (1) (1)  
Net Investment Hedges      
Derivative Instruments, Gain (Loss) [Line Items]      
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax 15 33  
Net Investment Hedges | Foreign exchange forwards/options      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in OCI (Effective Portion) 23 (82)  
Gain (Loss) Reclassified from OCI into Income (Effective Portion) $ 0 $ 0