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Long-Term Debt and Short-Term Borrowings - Narrative (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Mar. 04, 2024
Feb. 16, 2024
Sep. 30, 2025
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Aug. 31, 2025
Dec. 31, 2024
Debt Instrument [Line Items]                  
Loss on debt extinguishment, net       $ 82,000,000 $ 0 $ 82,000,000 $ 0    
Commercial paper     $ 0 0   0      
Commercial Paper                  
Debt Instrument [Line Items]                  
Debt instrument, face amount $ 2,000,000,000.0                
Debt instrument, term 364 days                
Senior Notes                  
Debt Instrument [Line Items]                  
Debt instrument, face amount     5,000,000,000 5,000,000,000   5,000,000,000      
Debt instrument, repurchase amount     1,900,000,000 1,900,000,000   1,900,000,000      
Loss on debt extinguishment, net           94,000,000      
Senior Notes | Estimate of Fair Value Measurement                  
Debt Instrument [Line Items]                  
Long-term debt, fair value     5,400,000,000 5,400,000,000   5,400,000,000     $ 7,800,000,000
Senior Notes | Reported Value Measurement                  
Debt Instrument [Line Items]                  
Long-term debt, fair value     5,100,000,000 5,100,000,000   5,100,000,000     $ 7,800,000,000
Senior Notes | 5.45% Senior Notes Due 2027                  
Debt Instrument [Line Items]                  
Debt instrument, face amount     1,000,000,000 1,000,000,000   1,000,000,000      
Debt instrument, repurchase amount     $ 650,000,000 $ 650,000,000   $ 650,000,000      
Interest rate, stated percentage     5.45% 5.45%   5.45%      
Debt instrument, term           3 years      
Senior Notes | 5.40% Senior Notes Due 2029                  
Debt Instrument [Line Items]                  
Debt instrument, face amount     $ 1,500,000,000 $ 1,500,000,000   $ 1,500,000,000      
Debt instrument, repurchase amount     $ 797,000,000 $ 797,000,000   $ 797,000,000      
Interest rate, stated percentage     5.40% 5.40%   5.40%      
Debt instrument, term           5 years      
Senior Notes | 5.90% Senior Notes Due 2054                  
Debt Instrument [Line Items]                  
Debt instrument, face amount     $ 1,250,000,000 $ 1,250,000,000   $ 1,250,000,000      
Debt instrument, repurchase amount     $ 22,000,000 $ 22,000,000   $ 22,000,000      
Interest rate, stated percentage     5.90% 5.90%   5.90%      
Debt instrument, term           30 years      
Senior Notes | 6.00% Senior Notes Due 2064                  
Debt Instrument [Line Items]                  
Debt instrument, face amount     $ 500,000,000 $ 500,000,000   $ 500,000,000      
Debt instrument, repurchase amount     $ 458,000,000 $ 458,000,000   $ 458,000,000      
Interest rate, stated percentage     6.00% 6.00%   6.00%      
Debt instrument, term           40 years      
Senior Notes | 5.45% Senior Notes Due 2031                  
Debt Instrument [Line Items]                  
Debt instrument, face amount     $ 1,000,000,000 $ 1,000,000,000   $ 1,000,000,000      
Interest rate, stated percentage     5.45% 5.45%   5.45%      
Debt instrument, term           7 years      
Senior Notes | 5.60% Senior Notes Due 2034                  
Debt Instrument [Line Items]                  
Debt instrument, face amount     $ 1,650,000,000 $ 1,650,000,000   $ 1,650,000,000      
Interest rate, stated percentage     5.60% 5.60%   5.60%      
Debt instrument, term           10 years      
Line of Credit | Revolving Credit Facility | Credit Facilities                  
Debt Instrument [Line Items]                  
Debt instrument, term   5 years              
Line of credit facility, maximum borrowing capacity   $ 2,000,000,000.0              
Long-term line of credit     $ 0 $ 0   $ 0      
Line of Credit | Eighteen month senior term loan credit facility | Credit Facilities                  
Debt Instrument [Line Items]                  
Debt instrument, term   18 months       18 months      
Line of credit facility, maximum borrowing capacity   $ 500,000,000              
Long-term line of credit               $ 0  
Line of Credit | Three year senior term loan credit facility | Credit Facilities                  
Debt Instrument [Line Items]                  
Debt instrument, term   3 years 3 years     3 years      
Line of credit facility, maximum borrowing capacity   $ 1,000,000,000.0              
Repayment of debt     $ 770,000,000