Acquisition and Assets Held for Sale - Summary of the Preliminary Valuation of Goodwill Allocated to Business Segments (Details) - USD ($) $ in Millions	Mar. 31, 2023	Mar. 29, 2023	Dec. 31, 2022
Business Acquisition [Line Items]
Goodwill	$ 84,057		$ 78,150
Signify Health, Inc.
Business Acquisition [Line Items]
Goodwill		$ 5,907
Signify Health, Inc. | Health Services
Business Acquisition [Line Items]
Goodwill		3,404
Signify Health, Inc. | Health Care Benefits
Business Acquisition [Line Items]
Goodwill		2,473
Signify Health, Inc. | Pharmacy & Consumer Wellness
Business Acquisition [Line Items]
Goodwill		$ 30