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Financial Instruments - Notional Values of Hedging Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Euro notes | Net investment hedge debt    
Derivative [Line Items]    
Notional Amount $ 3,688 $ 3,744
British pound sterling notes | Net investment hedge debt    
Derivative [Line Items]    
Notional Amount 355 360
Swiss franc notes | Net investment hedge debt    
Derivative [Line Items]    
Notional Amount 1,116 1,175
Canadian dollar notes | Net investment hedge debt    
Derivative [Line Items]    
Notional Amount 473 472
Currency exchange contracts | Intercompany loans and forecasted interest payments    
Derivative [Line Items]    
Notional Amount 1,185 2,184
Currency exchange contracts | Forecasted transactions    
Derivative [Line Items]    
Notional Amount 4,022 4,169
Commodity contracts    
Derivative [Line Items]    
Notional Amount 8,573 7,947
Interest rate contracts    
Derivative [Line Items]    
Notional Amount 1,850 3,500
Net investment hedge contracts    
Derivative [Line Items]    
Notional Amount 3,914 $ 4,551
Net investment hedge contracts | Net investment hedge debt    
Derivative [Line Items]    
Notional Amount $ 3,900