Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Future Minimum Payments Under Operating Leases [Table Text Block]

Lease commitments — Cash obligations under future minimum rental commitments under operating leases and net rental expense at December 31, 2018 are shown in the table below. Operating lease commitments are primarily related to facilities.

	2019		2020		2021		2022		2023		Thereafter		Total
Lease commitments	$	57	$	41	$	35	$	27	$	21	$	64	$	245

Rent Expense [Table Text Block]

	2018	2017	2016
Rent expense	$67	$61	$50