Leases - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Operating Leased Assets [Line Items]
Renewal term	15 years
Operating lease expense	$ 19
Operating lease payments	17
Total operating lease liability	$ 17
Lease term (in years)	6 years 1 month 6 days
Minimum
Operating Leased Assets [Line Items]
Term of contract (in years)	1 year
Maximum
Operating Leased Assets [Line Items]
Term of contract (in years)	9 years