Segment Information (Details) $ in Millions	3 Months Ended
Mar. 31, 2026 USD ($) segment	Mar. 31, 2025 USD ($)
Segment Reporting [Abstract]
Number of operating segments \| segment	4
Number of reportable segments \| segment	4
Segment Reporting Information [Line Items]
Premium and service revenues	$ 44,655	$ 42,489
Premium tax	5,289	4,131
Total external revenues	49,944	46,620
Total revenues	49,944	46,620
Medical costs	38,303	36,503
Cost of services	702	698
Other operating expenses	9,078	7,885
Other income (expense)	238	212
Earnings before income tax	2,099	1,746
Segment gross margin	5,650	5,288
Operating Segments
Segment Reporting Information [Line Items]
Total revenues	4,146	4,164
Eliminations
Segment Reporting Information [Line Items]
Total revenues	(4,146)	(4,164)
Premium
Segment Reporting Information [Line Items]
Premium and service revenues	43,887	41,712
Service
Segment Reporting Information [Line Items]
Premium and service revenues	768	777
Premium and service revenues
Segment Reporting Information [Line Items]
Premium and service revenues	44,655	42,489
Medicaid
Segment Reporting Information [Line Items]
Total revenues	28,885	26,430
Medical costs	21,955	20,843
Cost of services	23	24
Segment gross margin	1,618	1,432
Medicaid \| Operating Segments
Segment Reporting Information [Line Items]
Premium tax	5,289	4,131
Total external revenues	28,885	26,430
Total revenues	0	0
Medicaid \| Eliminations
Segment Reporting Information [Line Items]
Total revenues	0	0
Medicaid \| Premium \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	23,573	22,275
Medicaid \| Service \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	23	24
Medicaid \| Premium and service revenues \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	23,596	22,299
Medicare
Segment Reporting Information [Line Items]
Total revenues	10,326	8,759
Medical costs	8,772	7,555
Cost of services	0	0
Segment gross margin	1,554	1,204
Medicare \| Operating Segments
Segment Reporting Information [Line Items]
Premium tax	0	0
Total external revenues	10,326	8,759
Total revenues	0	0
Medicare \| Eliminations
Segment Reporting Information [Line Items]
Total revenues	0	0
Medicare \| Premium \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	10,326	8,759
Medicare \| Service \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	0	0
Medicare \| Premium and service revenues \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	10,326	8,759
Commercial
Segment Reporting Information [Line Items]
Total revenues	9,556	10,149
Medical costs	7,198	7,607
Cost of services	0	0
Segment gross margin	2,358	2,542
Commercial \| Operating Segments
Segment Reporting Information [Line Items]
Premium tax	0	0
Total external revenues	9,556	10,149
Total revenues	0	0
Commercial \| Eliminations
Segment Reporting Information [Line Items]
Total revenues	0	0
Commercial \| Premium \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	9,555	10,148
Commercial \| Service \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	1	1
Commercial \| Premium and service revenues \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	9,556	10,149
Other/Eliminations
Segment Reporting Information [Line Items]
Total revenues	1,177	1,282
Medical costs	378	498
Cost of services	679	674
Segment gross margin	120	110
Other/Eliminations \| Operating Segments
Segment Reporting Information [Line Items]
Premium tax	0	0
Total external revenues	1,177	1,282
Total revenues	4,146	4,164
Other/Eliminations \| Eliminations
Segment Reporting Information [Line Items]
Total revenues	(4,146)	(4,164)
Other/Eliminations \| Premium \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	433	530
Other/Eliminations \| Service \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	744	752
Other/Eliminations \| Premium and service revenues \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	$ 1,177	$ 1,282

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