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Acquisitions, Divestitures and Asset Sales - Schedule of Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
May 02, 2023
Mar. 29, 2023
Dec. 31, 2022
Business Acquisition [Line Items]          
Goodwill $ 91,272 $ 91,272     $ 78,150
Oak Street Health Inc.          
Business Acquisition [Line Items]          
Cash and cash equivalents     $ 201    
Investments     168    
Accounts receivable     1,143    
Other current assets (including restricted cash)     46    
Property and equipment     180    
Operating lease right-of-use assets     316    
Goodwill     7,213    
Intangible assets     4,233    
Other long-term assets     7    
Total assets acquired     13,507    
Health care costs payable     1,098    
Other current liabilities     444    
Operating lease liabilities (current and long-term)     378    
Debt (current and long-term)     1,028    
Deferred income taxes     796    
Other long-term liabilities     29    
Total liabilities assumed     3,773    
Noncontrolling interests     66    
Total consideration transferred     $ 9,668    
Signify Health, Inc.          
Business Acquisition [Line Items]          
Cash and cash equivalents       $ 376  
Accounts receivable       190  
Other current assets (including restricted cash)       147  
Property and equipment       25  
Goodwill       5,909  
Intangible assets       1,920  
Other long-term assets       23  
Total assets acquired       8,590  
Other current liabilities       606  
Debt (current and long-term)       346  
Deferred income taxes       259  
Other long-term liabilities       26  
Total liabilities assumed       1,237  
Total consideration transferred       7,353  
Restricted cash       $ 28