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Sales Of Receivables (Finance Receivables) (Details) - Equipment Installment - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross receivables sold $ 2,968 $ 2,698 $ 8,215 $ 8,950
Net receivables sold 2,842 2,590 7,834 8,623
Cash proceeds received 2,937 2,664 8,122 8,598
Deferred purchase price recorded 0 0 0 245
Guarantee obligation recorded $ 249 $ 173 $ 697 $ 469