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Financial Instruments - Notional Values of Hedging Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Net investment hedge debt | Euro notes    
Derivative [Line Items]    
Notional Amount $ 3,777 $ 3,679
Net investment hedge debt | British pound sterling notes    
Derivative [Line Items]    
Notional Amount 476 459
Net investment hedge debt | Swiss franc notes    
Derivative [Line Items]    
Notional Amount 1,468 1,694
Net investment hedge debt | Canadian dollar notes    
Derivative [Line Items]    
Notional Amount 465 0
Currency exchange contracts | Intercompany loans and forecasted interest payments    
Derivative [Line Items]    
Notional Amount 4,279 7,089
Currency exchange contracts | Forecasted transactions    
Derivative [Line Items]    
Notional Amount 2,243 2,213
Commodity contracts    
Derivative [Line Items]    
Notional Amount 956 1,204
Interest rate contracts    
Derivative [Line Items]    
Notional Amount 7,477 6,532
Net investment hedge contracts    
Derivative [Line Items]    
Notional Amount $ 6,608 $ 0