Commitments and Contingencies (Details) $ in Millions	12 Months Ended
	Dec. 31, 2012 member	Dec. 31, 2021 USD ($) lease	Dec. 31, 2020 USD ($) claim
Commitments and Contingencies Disclosure [Abstract]
Guarantor obligations, maximum exposure		$ 250
Contractual obligations underlying the guaranteed benefits		$ 1,300	$ 1,400
Number of leases guaranteed | lease		72
Loss Contingencies [Line Items]
Audit methodology sample size | member	200
Radcliff and Flaim v Aetna Inc., et al | Pending Litigation
Loss Contingencies [Line Items]
Number of claims | claim			2