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Financial Instruments - Narrative (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Apr. 30, 2024
USD ($)
interest_rate_swap
Derivative [Line Items]        
Derivative, notional amount $ 32,220   $ 30,551  
Pretax net unrealized gain on derivatives maturing within the next 12 months estimated to be reclassified from AOCI to sales 113      
Equity investments without readily determinable fair values 851 $ 942    
Unrealized gains recognized on investments in equity securities without readily determinable fair value 4 1    
Unrealized losses recognized on investments in equity securities without readily determinable fair values 5 21    
Cumulative unrealized gains on investments 297      
Cumulative unrealized losses on investments 69      
Income from investments in equity securities, net (143) (450)    
Fair value of loans payable and long-term debt, including current portion 30,400   32,000  
Debt, carrying amount 34,200   35,100  
Factored accounts receivable 2,700   3,000  
Cash collateral received from counterparties 58   3  
Equity Funds        
Derivative [Line Items]        
Equity securities held through ownership interest in investments funds 396 725    
Income from investments in equity securities, net 2 $ (132)    
Accounts Receivable Factoring Collections        
Derivative [Line Items]        
Restricted cash $ 43   44  
Senior Notes | 4.50% Notes Due 2033        
Derivative [Line Items]        
Stated interest rate 4.50%      
Level 2        
Derivative [Line Items]        
Cash equivalents $ 4,600   6,000  
Interest rate swap contracts | Subsequent Event        
Derivative [Line Items]        
Number of interest rate swaps | interest_rate_swap       2
Interest rate swap contracts | 4.50% note due 2033        
Derivative [Line Items]        
Derivative, notional amount 1,000      
Interest rate swap contracts | 4.50% note due 2033 | Subsequent Event        
Derivative [Line Items]        
Derivative, notional amount       $ 250
Derivatives Designated as Hedging Instruments        
Derivative [Line Items]        
Derivative, notional amount 13,424   12,754  
Derivatives Designated as Hedging Instruments | Interest rate swap contracts        
Derivative [Line Items]        
Derivative, notional amount 1,000   1,000  
Derivatives Not Designated as Hedging Instruments        
Derivative [Line Items]        
Derivative, notional amount $ 18,796   $ 17,797  
Maximum | Derivatives Designated as Hedging Instruments        
Derivative [Line Items]        
Maximum average period of maturities of contracts in years (less than) 2 years      
Maximum | Derivatives Not Designated as Hedging Instruments        
Derivative [Line Items]        
Maximum average period of maturities of contracts in years (less than) 6 months