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Derivative Financial Instruments (Schedule of Changes in Fair Value of Derivatives) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Derivative [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income (Loss) $ 1 $ (19) $ (50) $ (22)
Not Designated as Hedging Instrument [Member]        
Derivative [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income (Loss) 0 0 0 0
Gain (Loss) Recognized in Earnings (Loss) (1) 3 18 0
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]        
Derivative [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income (Loss) 0 0 0 0
Gain (Loss) Recognized in Earnings (Loss) (1) 3 18 0
Cash Flow Hedging [Member]        
Derivative [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income (Loss) 1 (17) (50) (18)
Gain (Loss) Recognized in Earnings (Loss) 0 2 0 4
Cash Flow Hedging [Member] | Commodity Contract [Member]        
Derivative [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income (Loss) 3 (2) 3 8
Gain (Loss) Recognized in Earnings (Loss) 0 2 0 4
Cash Flow Hedging [Member] | Interest Rate Swap [Member]        
Derivative [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income (Loss) (2) (15) (53) (26)
Gain (Loss) Recognized in Earnings (Loss) 0 0 0 0
Net Investment Hedging [Member]        
Derivative [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income (Loss) (30) (19) 37 20
Gain (Loss) Recognized in Earnings (Loss) 0 0 0 0
Net Investment Hedging [Member] | Currency Swap [Member]        
Derivative [Line Items]        
Gain (Loss) Recognized in Earnings (Loss) 0 0 0 0
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax (8) (6) 22 (6)
Foreign Currency Denominated Debt [Member] | Net Investment Hedging [Member]        
Derivative [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income (Loss) (22) (13) 15 26
Gain (Loss) Recognized in Earnings (Loss) $ 0 $ 0 $ 0 $ 0