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Sale Of Equipment Installment Receivables (Finance Receivables) (Details) - Finance Receivables [Member] - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross receivables sold $ 4,101 $ 3,010
Net receivables sold [1] 3,909 2,795
Cash proceeds received 3,675 2,395
Deferred purchase price recorded 309 519
Guarantee obligation recorded $ 138 $ 123
[1]
Receivables net of allowance, imputed interest and trade-in right guarantees.