Commitments and Contingencies (Details) $ in Millions	1 Months Ended	7 Months Ended	12 Months Ended
	Sep. 30, 2015 store	Aug. 31, 2019 claim	Dec. 31, 2019 USD ($) person lease	Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items]
Guarantor obligations, maximum exposure			$ 250
Contractual obligations underlying the guaranteed benefits			$ 1,400	$ 1,400
Number of leases guaranteed | lease			79
Guaranty liabilities			$ 84	$ 90
Number of store locations with subpoenas for documents | store	8
Number of class action compaints filed | claim		6
CMS Actions
Loss Contingencies [Line Items]
Sample size of audit | person			200