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Debt (Receivables Securitization Facility) (Narrative) (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Debt $ 28,267,000,000  
Receivables Securitization (Note 11) [Member]    
Debt Instrument [Line Items]    
Debt $ 0 $ 400,000,000