Sale Of Equipment Installment Receivables (Finance Receivables Repurchased) (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||||
|---|---|---|---|---|---|---|
Jun. 30, 2020 |
Jun. 30, 2019 |
Jun. 30, 2020 |
Jun. 30, 2019 |
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||
| Fair value of repurchased receivables | $ 285 | $ 235 | $ 573 | $ 658 | ||
| Carrying value of deferred purchase price | 281 | 225 | 558 | 632 | ||
| Gain (Loss) on repurchases | [1] | $ 4 | $ 10 | $ 15 | $ 26 | |
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