Retirement Plans - Schedule of Fair Value of Plan Assets (Details) - Pension Plans, Defined Benefit - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Assets	$ 40	$ 37	$ 54
Level 2
Defined Benefit Plan Disclosure [Line Items]
Assets	40	37
U.S. Equity Large Cap | Level 2
Defined Benefit Plan Disclosure [Line Items]
Assets	6	10
U.S. Equity Non-U.S. Equity | Level 2
Defined Benefit Plan Disclosure [Line Items]
Assets	20	16
Non-U.S. Bonds Corporate | Level 2
Defined Benefit Plan Disclosure [Line Items]
Assets	4	5
Non-U.S. Bonds Aggregate | Level 2
Defined Benefit Plan Disclosure [Line Items]
Assets	5	3
Other Investments | Level 2
Defined Benefit Plan Disclosure [Line Items]
Assets	$ 5	$ 3