Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of Lease Expense

A summary of lease expense and operating lease commitments is as follows:

	Years Ended December 31,
	2017		2016		2015
Lease expense	$	29	$	24	$	22

Schedule of Future Minimum Rental Payments for Operating Leases

	Years Ending December 31,
	2018		2019		2020		2021		2022		Thereafter		Total
Operating lease commitments	$	27	$	26	$	25	$	23	$	22	$	63	$	186