Segment Reporting - Reconciliation of Consolidated Operating Income to Adjusted Operating Income (Details) - USD ($) $ in Millions		3 Months Ended	9 Months Ended
Jun. 01, 2022	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting [Abstract]
Operating income (loss) (GAAP measure)		$ 3,690		$ (3,919)	$ 10,370	$ 4,295
Amortization of intangible assets		509		458	1,396	1,380
Net realized capital losses		142		110	345	283
Acquisition-related integration costs		94		0	294	0
Restructuring charges		11	$ 496	0	507	0
Office real estate optimization charges		10		0	46	0
Loss on assets held for sale		0		2,480	349	2,521
Opioid litigation charges		0		5,220	0	5,704
Gain on sale of subsidiary		0		0	0	(225)
Adjusted operating income		$ 4,456		$ 4,349	$ 13,307	$ 13,958
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Payflex \| Health Care Benefits
Segment Reporting, Other Significant Reconciling Item [Line Items]
Proceeds from divestiture of subsidiary	$ 775

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Office Real Estate Optimization Charges - Related to the abandonment of leased real estate and the related right-of-use assets and property and equipment

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Costs incurred to effect a business combination which have been expensed during the period. Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs.

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Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant.

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