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Sale Of Equipment Installment Receivables (Finance Receivables) (Details) - Finance Receivables [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross receivables sold $ 2,098 $ 2,161 $ 7,043 $ 7,077
Net receivables sold [1] 2,014 2,064 6,693 6,670
Cash proceeds received 1,700 1,752 5,895 5,679
Deferred purchase price recorded 352 335 922 1,161
Guarantee obligation recorded $ 67 $ 75 $ 261 $ 270
[1] Receivables net of allowance, imputed interest and equipment trade-in right guarantees.