Schedule II - Valuation and Qualifying Accounts Allowance for Doubtful Accounts (Tables)

12 Months Ended

Dec. 31, 2021

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

Schedule II - Valuation and Qualifying Accounts Disclosure [Text Block]

			Additions		Deductions
	Balance at Beginning of Year		Charged to Operations		Written Off		Balance at End of Year
Allowance for Doubtful Accounts Receivable:
2021	$	17	$	5	$	(5)	$	17
2020	$	18	$	4	$	(5)	$	17
2019	$	14	$	7	$	(3)	$	18

			Additions		Deductions
	Balance at Beginning of Year		Charged to Operations		Credited to Operations		Balance at End of Year
Deferred Tax Valuation Allowance:
2021	$	—	$	—	$	—	$	—
2020	$	—	$	—	$	—	$	—
2019	$	1	$	—	$	(1)	$	—