Annual Maturities of Financial Services Borrowings (Detail) - Financial Services $ in Millions	Dec. 31, 2024 USD ($)
Debt Instrument [Line Items]
2025	$ 8,359.6
2026	3,433.2
2027	2,156.5
2028	639.2
2029	1,008.2
2030 and beyond	350.0
Debt, Long-term and Short-term, Combined Amount, Total	15,946.7
Medium-term Notes
Debt Instrument [Line Items]
2025	2,623.4
2026	3,293.4
2027	2,064.0
2028	600.0
2029	999.9
2030 and beyond	350.0
Debt, Long-term and Short-term, Combined Amount, Total	9,930.7
Notes Payable to Banks
Debt Instrument [Line Items]
2025	239.1
2026	139.8
2027	92.5
2028	39.2
2029	8.3
Debt, Long-term and Short-term, Combined Amount, Total	518.9
Commercial Paper
Debt Instrument [Line Items]
2025	5,497.1
Debt, Long-term and Short-term, Combined Amount, Total	$ 5,497.1