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SEGMENT INFORMATION - Segment Results (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Premiums | $ 101,272 | $ 87,712 | $ 79,822
Services revenue | 4,033 | 4,776 | 3,055
Total revenues | 106,374 | 92,870 | 83,064
Investment income | 1,069 | 382 | 187
Benefits | 88,394 | 75,690 | 69,199
Operating costs | 13,188 | 12,671 | 10,121
Depreciation and amortization | 779 | 709 | 596
Total operating expenses | 102,361 | 89,070 | 79,916
Income (loss) from operations | 4,013 | 3,800 | 3,148
Gain on sale of Gentiva Hospice | 0 | (237) | 0
Interest expense | 493 | 401 | 326
Other expense, net | 137 | 68 | (532)
Income (loss) before income taxes and equity in net earnings (losses) | 3,383 | 3,568 | 3,354
Equity in net losses | (63) | (4) | 65
Segment earnings (loss) | 3,320 | 3,564 | 3,419
Net loss (income) attributable to noncontrolling interests | (5) | (4) | 1
Segment earnings (loss) attributable to Humana | 3,325 | 3,568 | 3,418
Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums | 101,272 | 87,712 | 79,822
Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Services revenue | 4,033 | 4,776 | 3,055
External Revenues |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 105,305 | 92,488 | 82,877
Total Medicare | Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums | 87,895 | 75,157 | 67,980
Individual Medicare Advantage | Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums | 78,837 | 65,591 | 58,654
Group Medicare Advantage | Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums | 6,869 | 7,297 | 6,955
Medicare stand-alone PDP | Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums | 2,189 | 2,269 | 2,371
Commercial fully-insured | Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums | 3,527 | 4,389 | 4,950
Specialty benefits | Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums | 1,007 | 1,047 | 1,052
Medicare Supplement | Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums | 735 | 743 | 731
State-based contracts and other | Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums | 8,108 | 6,376 | 5,109
Home solutions | Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Services revenue | 1,342 | 2,333 | 1,166
Primary care | Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Services revenue | 842 | 568 | 413
Commercial ASO | Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Services revenue | 237 | 300 | 306
Military services and other | Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Services revenue | 763 | 550 | 547
Pharmacy solutions | Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Services revenue | 849 | 1,025 | 623
Operating Segments | Insurance |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 102,854 | 88,841 | 80,930
Investment income | 551 | 223 | 214
Benefits | 89,100 | 75,934 | 69,639
Operating costs | 10,408 | 9,251 | 8,340
Depreciation and amortization | 692 | 634 | 539
Total operating expenses | 100,200 | 85,819 | 78,518
Income (loss) from operations | 2,654 | 3,022 | 2,412
Gain on sale of Gentiva Hospice |  | 0 |
Interest expense | 0 | 0 | 0
Other expense, net | 0 | 0 | 0
Income (loss) before income taxes and equity in net earnings (losses) | 2,654 | 3,022 | 2,412
Equity in net losses | (6) | 18 | 0
Segment earnings (loss) | 2,648 | 3,040 | 2,412
Net loss (income) attributable to noncontrolling interests | (6) | (5) | 0
Segment earnings (loss) attributable to Humana | 2,654 | 3,045 | 2,412
Operating Segments | Insurance | Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums | 101,272 | 87,712 | 79,822
Operating Segments | Insurance | Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Services revenue | 1,000 | 850 | 853
Operating Segments | Insurance | External Revenues |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 102,272 | 88,562 | 80,675
Operating Segments | Insurance | Total Medicare | Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums | 87,895 | 75,157 | 67,980
Operating Segments | Insurance | Individual Medicare Advantage | Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums | 78,837 | 65,591 | 58,654
Operating Segments | Insurance | Group Medicare Advantage | Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums | 6,869 | 7,297 | 6,955
Operating Segments | Insurance | Medicare stand-alone PDP | Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums | 2,189 | 2,269 | 2,371
Operating Segments | Insurance | Commercial fully-insured | Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums | 3,527 | 4,389 | 4,950
Operating Segments | Insurance | Specialty benefits | Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums | 1,007 | 1,047 | 1,052
Operating Segments | Insurance | Medicare Supplement | Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums | 735 | 743 | 731
Operating Segments | Insurance | State-based contracts and other | Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums | 8,108 | 6,376 | 5,109
Operating Segments | Insurance | Home solutions | Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Services revenue | 0 | 0 | 0
Operating Segments | Insurance | Primary care | Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Services revenue | 0 | 0 | 0
Operating Segments | Insurance | Commercial ASO | Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Services revenue | 237 | 300 | 306
Operating Segments | Insurance | Military services and other | Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Services revenue | 763 | 550 | 547
Operating Segments | Insurance | Pharmacy solutions | Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Services revenue | 0 | 0 | 0
Operating Segments | CenterWell |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 18,405 | 17,307 | 14,058
Investment income | 0 | 8 | 4
Benefits | 0 | 0 | 0
Operating costs | 16,791 | 15,835 | 12,968
Depreciation and amortization | 210 | 181 | 152
Total operating expenses | 17,001 | 16,016 | 13,120
Income (loss) from operations | 1,404 | 1,291 | 938
Gain on sale of Gentiva Hospice |  | (237) |
Interest expense | 3 | 0 | 0
Other expense, net | 0 | 0 | 0
Income (loss) before income taxes and equity in net earnings (losses) | 1,401 | 1,528 | 938
Equity in net losses | (57) | (22) | 65
Segment earnings (loss) | 1,344 | 1,506 | 1,003
Net loss (income) attributable to noncontrolling interests | 1 | 1 | 1
Segment earnings (loss) attributable to Humana | 1,343 | 1,505 | 1,002
Operating Segments | CenterWell | Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums | 0 | 0 | 0
Operating Segments | CenterWell | Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Services revenue | 3,033 | 3,926 | 2,202
Operating Segments | CenterWell | External Revenues |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 3,033 | 3,926 | 2,202
Operating Segments | CenterWell | Total Medicare | Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums | 0 | 0 | 0
Operating Segments | CenterWell | Individual Medicare Advantage | Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums | 0 | 0 | 0
Operating Segments | CenterWell | Group Medicare Advantage | Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums | 0 | 0 | 0
Operating Segments | CenterWell | Medicare stand-alone PDP | Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums | 0 | 0 | 0
Operating Segments | CenterWell | Commercial fully-insured | Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums | 0 | 0 | 0
Operating Segments | CenterWell | Specialty benefits | Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums | 0 | 0 | 0
Operating Segments | CenterWell | Medicare Supplement | Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums | 0 | 0 | 0
Operating Segments | CenterWell | State-based contracts and other | Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums | 0 | 0 | 0
Operating Segments | CenterWell | Home solutions | Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Services revenue | 1,342 | 2,333 | 1,166
Operating Segments | CenterWell | Primary care | Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Services revenue | 842 | 568 | 413
Operating Segments | CenterWell | Commercial ASO | Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Services revenue | 0 | 0 | 0
Operating Segments | CenterWell | Military services and other | Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Services revenue | 0 | 0 | 0
Operating Segments | CenterWell | Pharmacy solutions | Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Services revenue | 849 | 1,025 | 623
Eliminations/ Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | (14,885) | (13,278) | (11,924)
Investment income | 518 | 151 | (31)
Benefits | (706) | (244) | (440)
Operating costs | (14,011) | (12,415) | (11,187)
Depreciation and amortization | (123) | (106) | (95)
Total operating expenses | (14,840) | (12,765) | (11,722)
Income (loss) from operations | (45) | (513) | (202)
Gain on sale of Gentiva Hospice |  | 0 |
Interest expense | 490 | 401 | 326
Other expense, net | 137 | 68 | (532)
Income (loss) before income taxes and equity in net earnings (losses) | (672) | (982) | 4
Equity in net losses | 0 | 0 | 0
Segment earnings (loss) | (672) | (982) | 4
Net loss (income) attributable to noncontrolling interests | 0 | 0 | 0
Segment earnings (loss) attributable to Humana | (672) | (982) | 4
Eliminations/ Corporate | Insurance |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 31 | 56 | 41
Eliminations/ Corporate | Insurance | Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Eliminations/ Corporate | Insurance | Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 31 | 56 | 41
Eliminations/ Corporate | CenterWell |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 15,372 | 13,373 | 11,852
Eliminations/ Corporate | CenterWell | Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 10,451 | 9,841 | 9,024
Eliminations/ Corporate | CenterWell | Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 4,921 | 3,532 | 2,828
Intersegment Eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | (15,403) | (13,429) | (11,893)
Intersegment Eliminations | Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | (10,451) | (9,841) | (9,024)
Intersegment Eliminations | Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | $ (4,952) | $ (3,588) | $ (2,869)

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