Summary of Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Schedule of Other Costs [Table Text Block]

Engineering, research, development, and advertising expenses for the years ended December 31 were as follows (in billions):

	2021		2022		2023
Engineering, research, and development	$	7.6	$	7.8	$	8.2
Advertising	3.1		2.2		2.5