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Derivative Instruments (Narrative) (Details)
3 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2021
EUR (€)
Dec. 31, 2020
USD ($)
Foreign Exchange Contract      
Notional amount $ 8,588,000,000   $ 8,159,000,000
Interest Rate Swap      
Reclassification of gain (loss) from AOCI to earnings 11,000,000    
Designated as Hedging Instrument | Foreign Exchange Contract      
Derivative, Notional Amount | €   € 1,500,000,000  
Notional amount | €   € 4,350,000,000  
Derivative, fair value (222,000,000)    
Cash flow hedge gain (loss) to be reclassified within twelve months (16,000,000)    
Other Income 33,000,000    
Designated as Hedging Instrument | Interest Rate Swap      
Cash flow hedge gain (loss) to be reclassified within twelve months 5,000,000    
Cash Flow | Designated as Hedging Instrument      
Derivative, Notional Amount 750,000,000    
Cash Flow | Designated as Hedging Instrument | Foreign Exchange Contract      
Notional amount $ 927,000,000   $ 949,000,000