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Financial Instruments - Notional Values of Hedging Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Net investment hedge debt | Euro notes    
Derivative [Line Items]    
Notional Amount $ 3,340 $ 3,514
Net investment hedge debt | British pound sterling notes    
Derivative [Line Items]    
Notional Amount 324 336
Net investment hedge debt | Swiss franc notes    
Derivative [Line Items]    
Notional Amount 1,403 1,424
Net investment hedge debt | Canadian dollar notes    
Derivative [Line Items]    
Notional Amount 453 440
Currency exchange contracts | Intercompany loans and forecasted interest payments    
Derivative [Line Items]    
Notional Amount 4,695 3,239
Currency exchange contracts | Forecasted transactions    
Derivative [Line Items]    
Notional Amount 3,976 2,396
Commodity contracts    
Derivative [Line Items]    
Notional Amount 45 393
Interest rate contracts    
Derivative [Line Items]    
Notional Amount 6,500 8,679
Net investment hedge contracts    
Derivative [Line Items]    
Notional Amount 6,651 $ 6,678
Net investment hedge contracts | Net investment hedge debt    
Derivative [Line Items]    
Notional Amount $ 6,700