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Derivative and Other Financial Instruments (Notional Values of Outstanding Derivative Instruments in the Consolidated Balance Sheet) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Derivatives in cash flow hedges | Interest rate      
Derivatives, Fair Value [Line Items]      
Derivative, notional values     $ 200
Derivatives designated as hedges | Derivatives in cash flow hedges | Foreign exchange      
Derivatives, Fair Value [Line Items]      
Derivative, notional values $ 1,127 $ 1,030  
Derivatives designated as hedges | Derivatives in cash flow hedges | Commodities      
Derivatives, Fair Value [Line Items]      
Derivative, notional values 248 334  
Derivatives designated as hedges | Derivatives in cash flow hedges | Interest rate      
Derivatives, Fair Value [Line Items]      
Derivative, notional values 200 200  
Derivatives designated as hedges | Derivatives in fair value hedges | Foreign exchange      
Derivatives, Fair Value [Line Items]      
Derivative, notional values 183 142  
Derivatives designated as hedges | Net Investment Hedging | Foreign exchange      
Derivatives, Fair Value [Line Items]      
Derivative, notional values 1,075 1,075  
Derivatives not designated as hedges | Foreign exchange      
Derivatives, Fair Value [Line Items]      
Derivative, notional values $ 722 $ 1,017