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Sales Of Receivables (Finance Receivables) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Net receivables sold $ 3,553 $ 2,864 $ 11,510 $ 8,361
Cash proceeds received 3,563 2,873 11,590 8,725
Guarantee obligation recorded 58 39 172 475
Equipment Installment        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross receivables sold 1,624 2,098 5,497 7,043
Net receivables sold 1,578 2,014 5,300 6,693
Cash proceeds received 1,387 1,700 4,562 5,895
Deferred purchase price recorded 226 352 811 922
Guarantee obligation recorded $ 55 $ 67 $ 126 $ 261