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Financial Instruments - Notional Values of Derivative Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Net Investment Hedging | Euro notes    
Derivative [Line Items]    
Notional Amount $ 3,514 $ 3,679
Net Investment Hedging | British pound sterling notes    
Derivative [Line Items]    
Notional Amount 336 459
Net Investment Hedging | Swiss franc notes    
Derivative [Line Items]    
Notional Amount 1,424 1,694
Net Investment Hedging | Canadian dollar notes    
Derivative [Line Items]    
Notional Amount 440 0
Currency exchange contracts | Intercompany loans and forecasted interest payments    
Derivative [Line Items]    
Notional Amount 3,239 7,089
Currency exchange contracts | Forecasted transactions    
Derivative [Line Items]    
Notional Amount 2,396 2,213
Commodity contracts    
Derivative [Line Items]    
Notional Amount 393 1,204
Interest rate contracts    
Derivative [Line Items]    
Notional Amount 8,679 6,532
Net investment hedge contracts    
Derivative [Line Items]    
Notional Amount $ 6,678 $ 0