Segment Information (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Premium and service revenues	$ 145,505	$ 140,095	$ 135,479
Premium tax	17,566	13,904	9,068
Total external revenues	163,071	153,999	144,547
Total revenues	163,071	153,999	144,547
Medical costs	125,707	118,894	111,529
Cost of services	2,729	3,564	7,032
Other operating expense	31,460	28,611	24,668
Other income (expense)	1,082	668	644
Earnings before income tax	4,257	3,598	1,962
Segment Gross margin	17,069	17,637	16,918
Operating Segments
Segment Reporting Information [Line Items]
Total revenues	16,879	16,735	25,191
Eliminations
Segment Reporting Information [Line Items]
Total revenues	(16,879)	(16,735)	(25,191)
Premium
Segment Reporting Information [Line Items]
Premium and service revenues	142,303	135,636	127,131
Service
Segment Reporting Information [Line Items]
Premium and service revenues	3,202	4,459	8,348
Premium and service revenues
Segment Reporting Information [Line Items]
Premium and service revenues	145,505	140,095	135,479
Medicaid
Segment Reporting Information [Line Items]
Total revenues	101,417	100,759	93,151
Medical costs	77,516	78,210	75,298
Cost of services	89	4	0
Segment Gross margin	6,246	8,641	8,785
Medicaid \| Operating Segments
Segment Reporting Information [Line Items]
Premium tax	17,566	13,904	9,068
Total external revenues	101,417	100,759	93,151
Total revenues	0	0	0
Medicaid \| Eliminations
Segment Reporting Information [Line Items]
Total revenues	0	0	0
Medicaid \| Premium \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	83,758	86,853	84,084
Medicaid \| Service \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	93	2	(1)
Medicaid \| Premium and service revenues \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	83,851	86,855	84,083
Medicare
Segment Reporting Information [Line Items]
Total revenues	23,032	22,261	22,484
Medical costs	20,437	19,394	19,372
Cost of services	0	0	0
Segment Gross margin	2,595	2,867	3,112
Medicare \| Operating Segments
Segment Reporting Information [Line Items]
Premium tax	0	0	0
Total external revenues	23,032	22,261	22,484
Total revenues	0	0	0
Medicare \| Eliminations
Segment Reporting Information [Line Items]
Total revenues	0	0	0
Medicare \| Premium \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	23,032	22,261	22,484
Medicare \| Service \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	0	0	0
Medicare \| Premium and service revenues \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	23,032	22,261	22,484
Commercial
Segment Reporting Information [Line Items]
Total revenues	33,702	24,845	17,380
Medical costs	26,039	19,816	14,092
Cost of services	0	0	0
Segment Gross margin	7,663	5,029	3,288
Commercial \| Operating Segments
Segment Reporting Information [Line Items]
Premium tax	0	0	0
Total external revenues	33,702	24,845	17,380
Total revenues	0	0	0
Commercial \| Eliminations
Segment Reporting Information [Line Items]
Total revenues	0	0	0
Commercial \| Premium
Segment Reporting Information [Line Items]
Premium and service revenues	33,699	24,843	17,377
Commercial \| Service \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	3	2	3
Commercial \| Premium and service revenues \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	33,702	24,845	17,380
Other/Eliminations
Segment Reporting Information [Line Items]
Total revenues	4,920	6,134	11,532
Medical costs	1,715	1,474	2,767
Cost of services	2,640	3,560	7,032
Segment Gross margin	565	1,100	1,733
Other/Eliminations \| Operating Segments
Segment Reporting Information [Line Items]
Premium tax	0	0	0
Total external revenues	4,920	6,134	11,532
Total revenues	16,879	16,735	25,191
Other/Eliminations \| Eliminations
Segment Reporting Information [Line Items]
Total revenues	(16,879)	(16,735)	(25,191)
Other/Eliminations \| Premium \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	1,814	1,679	3,186
Other/Eliminations \| Service \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	3,106	4,455	8,346
Other/Eliminations \| Premium and service revenues \| Operating Segments
Segment Reporting Information [Line Items]
Premium and service revenues	$ 4,920	$ 6,134	$ 11,532

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