Summary of Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

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):

	2019		2020		2021
Engineering, research, and development	$	7.4	$	7.1	$	7.6
Advertising	3.6		2.8		3.1