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Financial Instruments - Notional Values of Derivative Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Net Investment Hedging | Euro notes    
Derivative [Line Items]    
Notional Amount $ 3,744 $ 3,436
Net Investment Hedging | British pound sterling notes    
Derivative [Line Items]    
Notional Amount 360 349
Net Investment Hedging | Swiss franc notes    
Derivative [Line Items]    
Notional Amount 1,175 1,448
Net Investment Hedging | Canadian dollar notes    
Derivative [Line Items]    
Notional Amount 472 462
Currency exchange contracts | Intercompany loans and forecasted interest payments    
Derivative [Line Items]    
Notional Amount 2,184 2,474
Currency exchange contracts | Forecasted transactions    
Derivative [Line Items]    
Notional Amount 4,169 3,993
Commodity contracts    
Derivative [Line Items]    
Notional Amount 7,947 7,238
Interest rate contracts    
Derivative [Line Items]    
Notional Amount 3,500 5,250
Net investment hedge contracts    
Derivative [Line Items]    
Notional Amount 4,551 $ 6,864
Net investment hedge contracts | Net Investment Hedging    
Derivative [Line Items]    
Notional Amount $ 4,600