Summary of Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

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):

	2017		2018		2019
Engineering, research, and development	$	8.0	$	8.2	$	7.4
Advertising	4.1		4.0		3.6