Segment Information (Details) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) segment	Sep. 30, 2023 USD ($)
Segment Reporting [Abstract]
Number of operating segments \| segment			4
Segment Reporting Information [Line Items]
Premium and service revenues	$ 36,899	$ 34,967	$ 109,209	$ 104,757
Premium tax	5,124	3,075	13,057	9,782
Total external revenues	42,023	38,042	122,266	114,539
Revenues	42,023	38,042	122,266	114,539
Medical costs	32,201	29,479	93,898	88,260
Cost of services	692	856	2,041	2,603
Gross margin	4,006	4,632	13,270	13,894
Operating Segments
Segment Reporting Information [Line Items]
Revenues	4,290	3,978	12,451	11,634
Eliminations
Segment Reporting Information [Line Items]
Revenues	(4,290)	(3,978)	(12,451)	(11,634)
Premium
Segment Reporting Information [Line Items]
Premium and service revenues	36,115	33,866	106,784	101,404
Service
Segment Reporting Information [Line Items]
Premium and service revenues	784	1,101	2,425	3,353
Premium and service revenues
Segment Reporting Information [Line Items]
Premium and service revenues	36,899	34,967	109,209	104,757
Medicaid
Segment Reporting Information [Line Items]
Revenues	26,440	24,694	76,083	75,523
Medical costs	19,818	19,607	58,080	59,076
Cost of services	23	0	66	2
Gross margin	1,475	2,012	4,880	6,663
Medicaid \| Operating Segments
Segment Reporting Information [Line Items]
Premium tax	5,124	3,075	13,057	9,782
Total external revenues	26,440	24,694	76,083	75,523
Revenues	0	0	0	0
Medicaid \| Eliminations
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Medicaid \| Premium \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	21,291	21,619	62,958	65,741
Medicaid \| Service \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	25	0	68	0
Medicaid \| Premium and service revenues \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	21,316	21,619	63,026	65,741
Medicare
Segment Reporting Information [Line Items]
Revenues	5,643	5,430	17,556	16,971
Medical costs	4,968	4,462	15,690	14,354
Cost of services	0	0	0	0
Gross margin	675	968	1,866	2,617
Medicare \| Operating Segments
Segment Reporting Information [Line Items]
Premium tax	0	0	0	0
Total external revenues	5,643	5,430	17,556	16,971
Revenues	0	0	0	0
Medicare \| Eliminations
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Medicare \| Premium \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	5,643	5,430	17,556	16,971
Medicare \| Service \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	0	0	0	0
Medicare \| Premium and service revenues \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	5,643	5,430	17,556	16,971
Commercial
Segment Reporting Information [Line Items]
Revenues	8,693	6,453	24,979	17,439
Medical costs	6,957	5,089	18,905	13,738
Cost of services	0	0	0	0
Gross margin	1,736	1,364	6,074	3,701
Commercial \| Operating Segments
Segment Reporting Information [Line Items]
Premium tax	0	0	0	0
Total external revenues	8,693	6,453	24,979	17,439
Revenues	0	0	0	0
Commercial \| Eliminations
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Commercial \| Premium
Segment Reporting Information [Line Items]
Premium and service revenues	8,693	6,451	24,977	17,437
Commercial \| Service \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	0	2	2	2
Commercial \| Premium and service revenues \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	8,693	6,453	24,979	17,439
Other/Eliminations
Segment Reporting Information [Line Items]
Revenues	1,247	1,465	3,648	4,606
Medical costs	458	321	1,223	1,092
Cost of services	669	856	1,975	2,601
Gross margin	120	288	450	913
Other/Eliminations \| Operating Segments
Segment Reporting Information [Line Items]
Premium tax	0	0	0	0
Total external revenues	1,247	1,465	3,648	4,606
Revenues	4,290	3,978	12,451	11,634
Other/Eliminations \| Eliminations
Segment Reporting Information [Line Items]
Revenues	(4,290)	(3,978)	(12,451)	(11,634)
Other/Eliminations \| Premium \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	488	366	1,293	1,255
Other/Eliminations \| Service \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	759	1,099	2,355	3,351
Other/Eliminations \| Premium and service revenues \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	$ 1,247	$ 1,465	$ 3,648	$ 4,606

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