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Pre-Tax Effects of Gain (Loss) on Cash Flow Hedges Recognized in OCI (Detail) - Derivative Contracts - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Interest-Rate Contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) recognized in OCI | $ (35.6) | $ 39.8 | $ (77.9) | $ 59.7
Foreign-exchange contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) recognized in OCI | (44.5) | 28.7 | (65.6) | (0.2)
Commodity Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) recognized in OCI | (2.0) | (43.7) | 1.9 | (7.8)
Truck, Parts and Other | Foreign-exchange contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) recognized in OCI | (47.1) | 28.5 | (67.2) | 0.1
Truck, Parts and Other | Commodity Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) recognized in OCI | (2.0) | (43.7) | 1.9 | (7.8)
Financial Services | Interest-Rate Contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) recognized in OCI | (35.6) | 39.8 | (77.9) | 59.7
Financial Services | Foreign-exchange contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) recognized in OCI | $ 2.6 | $ 0.2 | $ 1.6 | $ (0.3)

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