Adoption of New Leasing Standard - Lessee - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019
Leases [Abstract]
Remaining terms of leases			11 years
Remaining lease obligation			$ 7
Finance leases, discount rate			4.07%
Finance lease, right-of-use asset			$ 7
Net of sublease income	$ 147	$ 161