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SEGMENT INFORMATION - Schedule of Segment Results (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |
Premiums revenue | $ 30,716 | $ 28,142 | $ 61,230 | $ 56,403
Services revenue | 1,400 | 1,100 | 2,734 | 2,162
Total revenues | 32,388 | 29,540 | 64,500 | 59,151
Investment income | 272 | 298 | 536 | 586
Benefits | 27,565 | 25,039 | 54,100 | 50,163
Operating costs | 3,547 | 3,148 | 6,927 | 6,190
Depreciation and amortization | 178 | 212 | 361 | 421
Total operating expenses | 31,290 | 28,399 | 61,388 | 56,774
Income (loss) from operations | 1,098 | 1,141 | 3,112 | 2,377
Product |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Premiums revenue | 30,716 | 28,142 | 61,230 | 56,403
Service |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Services revenue | 1,400 | 1,100 | 2,734 | 2,162
External Revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 32,116 | 29,242 | 63,964 | 58,565
Operating Segments | Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 31,094 | 28,525 | 62,031 | 57,224
Investment income | 171 | 168 | 341 | 330
Benefits | 27,621 | 25,182 | 54,296 | 50,433
Operating costs | 2,558 | 2,395 | 5,092 | 4,759
Depreciation and amortization | 149 | 185 | 303 | 371
Total operating expenses | 30,328 | 27,762 | 59,691 | 55,563
Income (loss) from operations | 766 | 763 | 2,340 | 1,661
Operating Segments | CenterWell |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 5,537 | 4,947 | 10,632 | 9,765
Investment income | 0 | 0 | 0 | 0
Benefits | 0 | 0 | 0 | 0
Operating costs | 5,133 | 4,553 | 9,777 | 9,036
Depreciation and amortization | 60 | 56 | 119 | 109
Total operating expenses | 5,193 | 4,609 | 9,896 | 9,145
Income (loss) from operations | 344 | 338 | 736 | 620
Operating Segments | Product | Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Premiums revenue | 30,716 | 28,142 | 61,230 | 56,403
Operating Segments | Product | CenterWell |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Premiums revenue | 0 | 0 | 0 | 0
Operating Segments | Service | Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Services revenue | 206 | 214 | 458 | 489
Operating Segments | Service | CenterWell |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Services revenue | 1,194 | 886 | 2,276 | 1,673
Operating Segments | External Revenues | Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 30,922 | 28,356 | 61,688 | 56,892
Operating Segments | External Revenues | CenterWell |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1,194 | 886 | 2,276 | 1,673
Eliminations/ Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | (4,243) | (3,932) | (8,163) | (7,838)
Investment income | 101 | 130 | 195 | 256
Benefits | (56) | (143) | (196) | (270)
Operating costs | (4,144) | (3,800) | (7,942) | (7,605)
Depreciation and amortization | (31) | (29) | (61) | (59)
Total operating expenses | (4,231) | (3,972) | (8,199) | (7,934)
Income (loss) from operations | (12) | 40 | 36 | 96
Eliminations/ Corporate | Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1 | 1 | 2 | 2
Eliminations/ Corporate | CenterWell |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 4,343 | 4,061 | 8,356 | 8,092
Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ (4,344) | $ (4,062) | $ (8,358) | $ (8,094)

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