v3.26.1
Segments - Reconciliation of Gross Margin to Consolidated Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Revenue:        
Premium revenue $ 10,244 $ 10,868 $ 20,416 $ 21,496
Service revenue 24 22 46 44
Revenue from external customers 10,268 10,890 20,462 21,540
Other operating revenues 606 537 1,208 1,034
Total revenue 10,874 11,427 21,670 22,574
Operating expenses:        
Medical care costs 9,440 9,829 18,710 19,308
Cost of service revenue 22 19 43 38
Segment expenses 9,462 9,848 18,753 19,346
Other operating expenses 1,267 1,206 2,689 2,422
Operating income 145 373 228 806
Less: interest expense 54 48 108 91
Income before income tax expense 91 325 120 715
Medical margin        
Operating expenses:        
Segment margin 804 1,039 1,706 2,188
Service margin        
Operating expenses:        
Segment margin 2 3 3 6
Operating segments | Medicaid        
Revenue:        
Premium revenue 8,049 8,029 15,976 16,159
Service revenue 0 0 0 0
Revenue from external customers 8,049 8,029 15,976 16,159
Operating expenses:        
Medical care costs 7,464 7,332 14,760 14,671
Cost of service revenue 0 0 0 0
Segment expenses 7,464 7,332 14,760 14,671
Operating segments | Medicaid | Medical margin        
Operating expenses:        
Segment margin 585 697 1,216 1,488
Operating segments | Medicaid | Service margin        
Operating expenses:        
Segment margin 0 0 0 0
Operating segments | Medicare        
Revenue:        
Premium revenue 1,565 1,608 3,082 3,076
Service revenue 0 0 0 0
Revenue from external customers 1,565 1,608 3,082 3,076
Operating expenses:        
Medical care costs 1,419 1,447 2,782 2,743
Cost of service revenue 0 0 0 0
Segment expenses 1,419 1,447 2,782 2,743
Operating segments | Medicare | Medical margin        
Operating expenses:        
Segment margin 146 161 300 333
Operating segments | Medicare | Service margin        
Operating expenses:        
Segment margin 0 0 0 0
Operating segments | Marketplace        
Revenue:        
Premium revenue 628 1,200 1,352 2,204
Service revenue 0 0 0 0
Revenue from external customers 628 1,200 1,352 2,204
Operating expenses:        
Medical care costs 559 1,025 1,167 1,846
Cost of service revenue 0 0 0 0
Segment expenses 559 1,025 1,167 1,846
Operating segments | Marketplace | Medical margin        
Operating expenses:        
Segment margin 69 175 185 358
Operating segments | Marketplace | Service margin        
Operating expenses:        
Segment margin 0 0 0 0
Operating segments | Other        
Revenue:        
Premium revenue 2 31 6 57
Service revenue 24 22 46 44
Revenue from external customers 26 53 52 101
Operating expenses:        
Medical care costs (2) 25 1 48
Cost of service revenue 22 19 43 38
Segment expenses 20 44 44 86
Operating segments | Other | Medical margin        
Operating expenses:        
Segment margin 4 6 5 9
Operating segments | Other | Service margin        
Operating expenses:        
Segment margin $ 2 $ 3 $ 3 $ 6