Goodwill and Other Intangible Assets - Components of Other Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 6,229	$ 8,666
Accumulated Amortization	(3,186)	(4,465)
Net Carrying Amount	3,043	4,201
Intangible Assets [Line Items]
Gross Carrying Amount	8,157	7,893
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Carrying Amount, Total Intangible Assets	14,386	16,559
Net Carrying Amount	11,200	12,094
Blue Cross and Blue Shield and other trademarks
Intangible Assets [Line Items]
Gross Carrying Amount	5,991	5,991
State Medicaid licenses
Intangible Assets [Line Items]
Gross Carrying Amount	2,166	1,902
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,522	7,866
Accumulated Amortization	(2,894)	(4,233)
Net Carrying Amount	2,628	3,633
Provider and hospital relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	312	377
Accumulated Amortization	(182)	(165)
Net Carrying Amount	130	212
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	395	423
Accumulated Amortization	(110)	(67)
Net Carrying Amount	$ 285	$ 356