Consolidated Balance Sheets (Parenthetical) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Marketable debt securities, allowance	$ 0	$ 0
Preferred stock, no par value	$ 0	$ 0	[1]
Preferred stock, authorized	1,000,000.0	1,000,000.0	[1]
Preferred stock, issued	0	0	[1]
Common stock, par value	$ 1	$ 1	[1]
Common stock, authorized	1,200,000,000	1,200,000,000	[1]
Common stock, issued	347,200,000	346,600,000	[1]
Treasury stock, shares	20,000.00
Truck, Parts and Other
Allowance for losses	$ 600,000	$ 600,000	[1]
Marketable debt securities, amortized cost	1,408,400,000	1,409,700,000	[1]
Marketable debt securities, allowance	0	0	[1]
Financial Services
Allowance for credit losses	$ 126,800,000	$ 127,000,000.0	[1]

[1] The December 31, 2020 consolidated balance sheet has been derived from audited financial statements.