Commitments and Contingencies (Details) $ in Millions	1 Months Ended		3 Months Ended		12 Months Ended
	Dec. 31, 2022 USD ($) state	Aug. 31, 2022 USD ($)	Mar. 31, 2023 USD ($) lease	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($) state	Sep. 30, 2020 claim
Commitments and Contingencies Disclosure [Abstract]
Guarantor obligations, number of leases | lease			64
Loss Contingencies [Line Items]
Opioid litigation charge			$ 0	$ 484
Federal Court in Ohio Judgment | Pending Litigation
Loss Contingencies [Line Items]
Legal settlement awarded to other party		$ 651
Legal settlement, period of payment		15 years
Settlement Framework
Loss Contingencies [Line Items]
Legal settlement awarded to other party	$ 4,300
Legal settlement, period of payment	10 years				10 years
Attorneys' fees and costs	$ 625
Number of states that elected to join the settlement | state	45				45
Number of states under separate settlement agreements | state	4				4
Settlement Framework | Tribal Entities
Loss Contingencies [Line Items]
Legal settlement awarded to other party	$ 113
Legal settlement, period of payment	10 years				10 years
Attorneys' fees and costs	$ 16
Settlement Framework and Other Opioid-Related Claims
Loss Contingencies [Line Items]
Opioid litigation charge					$ 5,300
Radcliffe and Flaim v. Aetna Inc., et al | Pending Litigation
Loss Contingencies [Line Items]
Number of claims | claim						2