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Segment Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting [Abstract]
Number of operating segments | segment	2
Revenues	$ 144,547	$ 125,982	$ 111,115
Earnings (loss) from operations	1,318	1,784	3,082
Managed Care
Revenues	135,063	120,125	106,867
Earnings (loss) from operations	1,913	1,789	3,031
Specialty Services
Revenues	22,765	18,652	14,994
Earnings (loss) from operations	(595)	(5)	51
Operating Segments | Managed Care
Revenues	135,055	120,119	106,862
Operating Segments | Specialty Services
Revenues	9,492	5,863	4,253
Eliminations
Revenues	(13,281)	(12,795)	(10,746)
Eliminations | Managed Care
Revenues	8	6	5
Eliminations | Specialty Services
Revenues	$ 13,273	$ 12,789	$ 10,741

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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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The net result for the period of deducting operating expenses from operating revenues.

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