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SEGMENT INFORMATION - Narrative (Details) $ in Millions	12 Months Ended
SEGMENT INFORMATION - Narrative (Details) $ in Millions	Dec. 31, 2025 USD ($) segment	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| segment	2
Member co-share amounts and government subsidies	$ 14,100	$ 20,300	$ 20,700
Depreciation and amortization classified as benefit expense	$ 125	$ 129	$ 138
Federal Government Contracts \| Premiums and Services Revenue \| Government Contracts Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk (as percent)	83.00%	85.00%	84.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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