Retirement Plans - Schedule of Fair Value of Plan Assets (Details) - Pension Plans, Defined Benefit - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Assets	$ 54	$ 60	$ 51
Level 2
Defined Benefit Plan Disclosure [Line Items]
Assets	54	60
U.S. Equity Large Cap | Level 2
Defined Benefit Plan Disclosure [Line Items]
Assets	7	16
U.S. Equity Non-U.S. Equity | Level 2
Defined Benefit Plan Disclosure [Line Items]
Assets	13	8
Non-U.S. Bonds Corporate | Level 2
Defined Benefit Plan Disclosure [Line Items]
Assets	3	0
Non-U.S. Bonds Aggregate | Level 2
Defined Benefit Plan Disclosure [Line Items]
Assets	4	7
Non-U.S. Bonds Insurance Contracts | Level 2
Defined Benefit Plan Disclosure [Line Items]
Assets	24	25
Other Investments | Level 2
Defined Benefit Plan Disclosure [Line Items]
Assets	$ 4	$ 4