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Receivables (Details) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) agreement | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Schedule Of Financial Receivables [Line Items] |  |  |  |  |  |
Accounts receivable securitization arrangements | agreement |  |  |  | 2 |  |
Accounts receivable securitization |  | $ 325 |  | $ 325 |  | $ 425
Accounts receivable securitization amount drawn |  | 250 |  | 250 |  | 250
Receivables Sale Program |  |  |  |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |  |  |  |
Repurchases of receivables | $ 211 |  |  |  |  |
Cash payment for repurchase of receivables | 160 |  |  |  |  |
Decrease from termination of deferred purchase program receivable | 51 |  |  |  |  |
Deferred purchase program receivable | 0 | 0 |  | 0 |  | 12
Net cash funding received during the period |  |  |  | 44 | $ 153 |
Amount of cash draws under arrangement during the period |  |  |  | 41 | 189 |
Amount of cash repayments under arrangement during the period |  |  |  | 85 | 342 |
Receivables Purchase Agreement |  |  |  |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |  |  |  |
Funding of customer receivables sold | 325 |  |  |  |  |
Repurchases of receivables | 211 |  |  |  |  |
Increase in funding of customer receivables sold | $ 200 |  |  |  |  |
Accounts receivables sold |  | 398 |  | 553 |  |
Accounts receivable remaining outstanding |  | 250 |  | 250 |  | 46
Financing receivables, held as collateral |  | 90 |  | 90 |  | $ 33
Customer One |  |  |  |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |  |  |  |
Accounts receivables sold |  | 103 |  | 267 |  |
Accounts receivable remaining outstanding |  | $ 102 |  | 102 |  |
Customer Two |  |  |  |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |  |  |  |
Accounts receivables sold |  |  | $ 42 |  | $ 131 |
Maximum | Receivables Sale Program |  |  |  |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |  |  |  |
Funding of customer receivables sold |  |  |  | 300 |  |
Maximum | Receivables Purchase Agreement |  |  |  |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |  |  |  |
Funding of customer receivables sold |  |  |  | $ 125 |  |

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