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Financial Instruments - Notional Values of Hedging Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Net investment hedge debt | Euro notes    
Derivative [Line Items]    
Notional Amount $ 3,438 $ 3,514
Net investment hedge debt | British pound sterling notes    
Derivative [Line Items]    
Notional Amount 343 336
Net investment hedge debt | Swiss franc notes    
Derivative [Line Items]    
Notional Amount 1,407 1,424
Net investment hedge debt | Canadian dollar notes    
Derivative [Line Items]    
Notional Amount 449 440
Currency exchange contracts | Intercompany loans and forecasted interest payments    
Derivative [Line Items]    
Notional Amount 2,565 3,239
Currency exchange contracts | Forecasted transactions    
Derivative [Line Items]    
Notional Amount 2,617 2,396
Commodity contracts    
Derivative [Line Items]    
Notional Amount 683 393
Interest rate contracts    
Derivative [Line Items]    
Notional Amount 7,631 8,679
Net investment hedge contracts    
Derivative [Line Items]    
Notional Amount $ 6,685 $ 6,678