Summary of Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

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):

	2014		2015		2016
Engineering, research, and development	$	6.7	$	6.7	$	7.3
Advertising	4.3		4.3		4.3