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Goodwill and Intangible Assets, Net - Intangible Assets Balances (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]    
Cost $ 742 $ 601
Accumulated Amortization 475 393
Carrying Amount 267 208
Contract rights and licenses    
Finite-Lived Intangible Assets [Line Items]    
Cost 624 520
Accumulated Amortization 429 357
Carrying Amount 195 163
Provider networks    
Finite-Lived Intangible Assets [Line Items]    
Cost 64 59
Accumulated Amortization 34 29
Carrying Amount 30 30
Trade names    
Finite-Lived Intangible Assets [Line Items]    
Cost 54 22
Accumulated Amortization 12 7
Carrying Amount $ 42 $ 15