v3.25.0.1
Borrowings and Credit Agreements - Long-term Borrowings (Details) - USD ($)
1 Months Ended 12 Months Ended
Dec. 10, 2034
Mar. 10, 2030
Dec. 10, 2024
May 09, 2024
Oct. 20, 2023
Jul. 21, 2023
Jun. 02, 2023
May 02, 2023
May 01, 2023
Feb. 21, 2023
Dec. 31, 2024
Feb. 28, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]                              
Proceeds from debt     $ 3,000,000,000 $ 5,000,000,000     $ 4,900,000,000   $ 5,000,000,000 $ 6,000,000,000   $ 6,000,000,000      
Cash payment of debt                         $ 4,773,000,000 $ 3,166,000,000 $ 4,211,000,000
Gain on early extinguishment of debt                         $ 491,000,000 $ 0 $ 0
Junior Subordinated Debt | 7% series A junior subordinated notes due March 2055                              
Debt Instrument [Line Items]                              
Debt face amount     $ 2,250,000,000                        
Debt interest rate     7.00%               7.00%   7.00%    
Initial redemption period prior to first interest rate date     90 days                        
Junior Subordinated Debt | 7% series A junior subordinated notes due March 2055 | Forecast                              
Debt Instrument [Line Items]                              
Interest rate recurring reset period   5 years                          
Junior Subordinated Debt | 6.75% series B junior subordinated notes due December 2054                              
Debt Instrument [Line Items]                              
Debt face amount     $ 750,000,000                        
Debt interest rate     6.75%               6.75%   6.75%    
Initial redemption period prior to first interest rate date     90 days                        
Junior Subordinated Debt | 6.75% series B junior subordinated notes due December 2054 | Forecast                              
Debt Instrument [Line Items]                              
Interest rate recurring reset period 5 years                            
Senior Notes                              
Debt Instrument [Line Items]                              
Debt face amount       5,000,000,000                      
Principal amount of debt repaid                     $ 2,600,000,000        
Cash payment of debt                     2,000,000,000.0        
Gain on early extinguishment of debt                     $ 491,000,000        
Senior Notes | 5.4% senior notes due June 2029                              
Debt Instrument [Line Items]                              
Debt face amount       $ 1,000,000,000                      
Debt interest rate       5.40%             5.40%   5.40%    
Senior Notes | 5.55% senior notes due June 2031                              
Debt Instrument [Line Items]                              
Debt face amount       $ 1,000,000,000                      
Debt interest rate       5.55%             5.55%   5.55%    
Senior Notes | 5.7% senior notes due June 2034                              
Debt Instrument [Line Items]                              
Debt face amount       $ 1,250,000,000                      
Debt interest rate       5.70%             5.70%   5.70%    
Senior Notes | 6% senior notes due June 2044                              
Debt Instrument [Line Items]                              
Debt face amount       $ 750,000,000                      
Debt interest rate       6.00%             6.00%   6.00%    
Senior Notes | 6.05% senior notes due June 2054                              
Debt Instrument [Line Items]                              
Debt face amount       $ 1,000,000,000                      
Debt interest rate       6.05%             6.05%   6.05%    
Senior Notes | 5% senior notes due January 2029                              
Debt Instrument [Line Items]                              
Debt face amount             $ 1,000,000,000                
Debt interest rate             5.00%       5.00%   5.00%    
Senior Notes | 5.25% senior notes due January 2031                              
Debt Instrument [Line Items]                              
Debt face amount             $ 750,000,000                
Debt interest rate             5.25%       5.25%   5.25%    
Senior Notes | 5.3% senior notes due June 2033                              
Debt Instrument [Line Items]                              
Debt face amount             $ 1,250,000,000                
Debt interest rate             5.30%       5.30%   5.30%    
Senior Notes | 5.875% senior notes due June 2053                              
Debt Instrument [Line Items]                              
Debt face amount             $ 1,250,000,000                
Debt interest rate             5.875%       5.875%   5.875%    
Senior Notes | 6% senior notes due June 2063                              
Debt Instrument [Line Items]                              
Debt face amount             $ 750,000,000                
Debt interest rate             6.00%       6.00%   6.00%    
Senior Notes | 5% senior notes due February 2026                              
Debt Instrument [Line Items]                              
Debt face amount                   $ 1,500,000,000          
Debt interest rate                   5.00% 5.00%   5.00%    
Senior Notes | 5.125% senior notes due February 2030                              
Debt Instrument [Line Items]                              
Debt face amount                   $ 1,500,000,000          
Debt interest rate                   5.125% 5.125%   5.125%    
Senior Notes | 5.25% senior notes due February 2033                              
Debt Instrument [Line Items]                              
Debt face amount                   $ 1,750,000,000          
Debt interest rate                   5.25% 5.25%   5.25%    
Senior Notes | 5.625% senior notes due February 2053                              
Debt Instrument [Line Items]                              
Debt face amount                   $ 1,250,000,000          
Debt interest rate                   5.625% 5.625%   5.625%    
Senior Notes | 4.1% senior notes due March 2025                              
Debt Instrument [Line Items]                              
Debt interest rate                     4.10%   4.10%    
Principal amount of debt repaid                     $ 226,000,000        
Senior Notes | 4.125% senior notes due April 2040                              
Debt Instrument [Line Items]                              
Debt interest rate                     4.125%   4.125%    
Principal amount of debt repaid                     $ 398,000,000        
Senior Notes | 2.7% senior notes due August 2040                              
Debt Instrument [Line Items]                              
Debt interest rate                     2.70%   2.70%    
Principal amount of debt repaid                     $ 883,000,000        
Senior Notes | 4.125% senior notes due November 2042                              
Debt Instrument [Line Items]                              
Debt interest rate                     4.125%   4.125%    
Principal amount of debt repaid                     $ 274,000,000        
Senior Notes | 3.875% senior notes due August 2047                              
Debt Instrument [Line Items]                              
Debt interest rate                     3.875%   3.875%    
Principal amount of debt repaid                     $ 463,000,000        
Senior Notes | 4.25% senior notes due April 2050                              
Debt Instrument [Line Items]                              
Debt interest rate                     4.25%   4.25%    
Principal amount of debt repaid                     $ 351,000,000        
Convertible Debt | 0% convertible senior notes due March 2026                              
Debt Instrument [Line Items]                              
Repurchase price of convertible senior notes, as a percent of principal               100.00%              
Conversion of convertible senior notes with cash         $ 3,000,000 $ 917,000,000                  
Convertible Debt | 0% convertible senior notes due March 2026 | Oak Street Health Inc.                              
Debt Instrument [Line Items]                              
Debt face amount                 $ 920,000,000            
Debt interest rate                 0.00%