v3.25.0.1
Significant Accounting Policies - Variable Interest Entities Balances (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Variable Interest Entity [Line Items]    
Total assets $ 253,215 $ 249,728
Total liabilities 177,485 173,092
Long-term investments 28,934 23,019
Variable Interest Entity, Primary Beneficiary, Physicians Groups    
Variable Interest Entity [Line Items]    
Total assets 2,144 1,515
Total liabilities 2,104 1,503
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Long-term investments 2,618 2,018
Variable Interest Entity, Not Primary Beneficiary | Hedge fund investments    
Variable Interest Entity [Line Items]    
Long-term investments 1,246 859
Variable Interest Entity, Not Primary Beneficiary | Private equity investments    
Variable Interest Entity [Line Items]    
Long-term investments 934 840
Variable Interest Entity, Not Primary Beneficiary | Real estate partnerships    
Variable Interest Entity [Line Items]    
Long-term investments $ 438 $ 319