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Financial Instruments - Narrative (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
interest_rate_swap
Dec. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
interest_rate_swap
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jan. 31, 2021
USD ($)
interest_rate_swap
Derivative [Line Items]            
Notional amount of derivative $ 32,958,000,000 $ 32,784,000,000 $ 32,958,000,000 $ 32,784,000,000    
Face amount of debt 8,000,000,000   8,000,000,000      
Pre tax net unrealized gain on derivatives maturing within next 12 months estimated to be reclassified from AOCI to sales     170,000,000      
Equity investments without readily determinable fair values 596,000,000 586,000,000 596,000,000 586,000,000    
Unrealized gains recognized on investments in equity securities without readily determinable fair value     110,000,000 62,000,000    
Unrealized losses recognized on investments in equity securities without readily determinable fair values     1,000,000 3,000,000    
Cumulative upward price adjustment 234,000,000   234,000,000      
Cumulative downward price adjustment 7,000,000   7,000,000      
Fair value of loans payable and long-term debt, including current portion 35,700,000,000 36,000,000,000 35,700,000,000 36,000,000,000    
Debt, carrying amount 33,100,000,000 31,800,000,000 33,100,000,000 31,800,000,000    
Factored accounts receivable 2,800,000,000 2,100,000,000        
Funds collected from factoring of receivable, held in restricted cash 62,000,000 102,000,000 62,000,000 102,000,000    
Cash collateral received from counterparties 164,000,000 0 164,000,000 0    
Cash collateral advanced to counterparties 0 36,000,000 0 36,000,000    
Equity securities held through ownership interests in investment funds 1,700,000,000 800,000,000 1,700,000,000 800,000,000    
(Gains) losses for equity securities held through ownership interests in investment funds     $ (1,400,000,000) (583,000,000) $ 113,000,000  
3.875% Notes Due 2021            
Derivative [Line Items]            
Face amount of debt           $ 1,150,000,000
Stated interest rate           3.875%
Customer Concentration Risk | Accounts Receivable | McKesson            
Derivative [Line Items]            
Percentage of accounts receivable represented by customers with largest balances (as percent)     20.00%      
Customer Concentration Risk | Accounts Receivable | AmerisourceBergen Corporation            
Derivative [Line Items]            
Percentage of accounts receivable represented by customers with largest balances (as percent)     15.00%      
Customer Concentration Risk | Accounts Receivable | Cardinal Health, Inc.            
Derivative [Line Items]            
Percentage of accounts receivable represented by customers with largest balances (as percent)     10.00%      
Level 2            
Derivative [Line Items]            
Cash equivalents $ 6,800,000,000 6,800,000,000 $ 6,800,000,000 6,800,000,000    
Interest Rate Swap            
Derivative [Line Items]            
Number of interest rate swaps held | interest_rate_swap 9   9     5
Notional amount of derivative           $ 1,150,000,000
Derivatives Designated as Hedging Instruments            
Derivative [Line Items]            
Notional amount of derivative $ 12,245,000,000 13,714,000,000 $ 12,245,000,000 13,714,000,000    
Derivatives Not Designated as Hedging Instruments            
Derivative [Line Items]            
Notional amount of derivative $ 20,713,000,000 $ 19,070,000,000 $ 20,713,000,000 $ 19,070,000,000    
Maximum | Derivatives Designated as Hedging Instruments            
Derivative [Line Items]            
Maximum planning cycle of hedges (less than)     2 years      
Maximum | Derivatives Not Designated as Hedging Instruments            
Derivative [Line Items]            
Maximum planning cycle of hedges (less than)     1 year