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Subsequent events (Details) - USD ($) $ in Millions	Jan. 03, 2023	Dec. 19, 2022	Nov. 15, 2021
Term Loan \| Credit facilities
Subsequent Event [Line Items]
Face amount			$ 3,000
Subsequent Event \| VillageMD
Subsequent Event [Line Items]
Business combination, consideration transferred, equity interests issued and issuable	$ 1,750
Noncontrolling interest, ownership percentage by parent	53.00%
Debt instrument, fee amount, credit	$ 220
Subsequent Event \| Cigna \| VillageMD
Subsequent Event [Line Items]
Business combination, consideration transferred, equity interests issued and issuable	2,500
Subsequent Event \| Line of Credit \| VillageMD
Subsequent Event [Line Items]
Face amount	2,250
Subsequent Event \| Term Loan \| Line of Credit \| VillageMD
Subsequent Event [Line Items]
Face amount	1,750
Subsequent Event \| Credit facilities \| Line of Credit \| VillageMD
Subsequent Event [Line Items]
Face amount	500
Subsequent Event \| Senior Unsecured Notes Payable, Due 2026 \| Term Loan
Subsequent Event [Line Items]
Face amount		$ 1,000
Summit Health-CityMD \| Subsequent Event
Subsequent Event [Line Items]
Cash consideration, subject to purchase price adjustments	7,000
Purchase price	4,850
Business combination, consideration transferred, equity interests issued and issuable	2,050
Business combination, consideration transferred, additional cash consideration	100
Repayments of debt	$ 1,900