Summary of Significant Accounting Policies - Adjustments Made Due to ASU 2014-09 Impact on Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Assets
Inventories, net	$ 157		$ 154
Prepaid expenses and contract assets	29		34
Equity
Net Former Parent investment			$ 844
Additional paid-in capital	1,915
ASU 2014-09
Assets
Inventories, net		$ 149
Prepaid expenses and contract assets		41
Equity
Net Former Parent investment		845
Adjustments due to ASU 2014-09 / Effect of Changes | ASU 2014-09
Assets
Inventories, net	(5)	(5)
Prepaid expenses and contract assets	7	7
Equity
Net Former Parent investment		$ 1
Additional paid-in capital	1
Balances without adoption of ASC 606 | ASU 2014-09
Assets
Inventories, net	162
Prepaid expenses and contract assets	22
Equity
Additional paid-in capital	$ 1,914