Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Preferred stock, no par value	$ 0	$ 0
Preferred stock, authorized	1,000,000	1,000,000
Preferred stock, issued	0	0
Common stock, par value	$ 1	$ 1
Common stock, authorized	1,200,000,000	1,200,000,000
Common stock, issued	523,300,000	522,000,000
Truck, Parts and Other
Allowance for losses	$ 0.9	$ 0.6
Financial Services
Allowance for credit losses	$ 133.0	$ 121.1