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Financial Instruments - Narrative (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2020
USD ($)
Feb. 29, 2020
USD ($)
interest_rate_swap
Derivative [Line Items]            
Notional amount of derivative $ 32,784,000,000 $ 30,666,000,000 $ 32,784,000,000 $ 30,666,000,000    
Face amount of debt         $ 4,500,000,000  
Pre tax net unrealized gain (loss) on derivatives maturing within next 12 months estimated to be reclassified from AOCI to sales     (331,000,000)      
Equity investments without readily determinable fair values 586,000,000 420,000,000 586,000,000 420,000,000    
Unrealized gains based on favorable observable price changes     62,000,000 20,000,000    
Unrealized loss related to unfavorable observable price changes     3,000,000 13,000,000    
Cumulative upward price adjustment 169,000,000   169,000,000      
Cumulative downward price adjustment 24,000,000   24,000,000      
Payments of contingent consideration     106,000,000 85,000,000    
Fair value of loans payable and long-term debt, including current portion 36,000,000,000.0 28,800,000,000 36,000,000,000.0 28,800,000,000    
Long term and short term debt 31,800,000,000 26,300,000,000 31,800,000,000 26,300,000,000    
Accounts receivable factored 2,300,000,000 2,700,000,000        
Funds collected from factoring of receivable, held in restricted cash 102,000,000 256,000,000 102,000,000 256,000,000    
Cash collateral received from counterparties 0 34,000,000 0 34,000,000    
Right to reclaim cash 36,000,000 0 $ 36,000,000 0    
1.85% Notes Due 2020 [Member]            
Derivative [Line Items]            
Face amount of debt           $ 1,250,000,000
Fixed-rate notes, stated interest rate (as percent)           1.85%
Customer Concentration Risk | Accounts Receivable | McKesson Corporation, AmerisourceBergen Corporation and Cardinal Health, Inc.            
Derivative [Line Items]            
Percentage of accounts receivable represented by customers with largest balances (as percent)     45.00%      
Level 2            
Derivative [Line Items]            
Cash equivalents 6,800,000,000 8,900,000,000 $ 6,800,000,000 8,900,000,000    
Interest Rate Swap            
Derivative [Line Items]            
Number of interest rate swaps held | interest_rate_swap           5
Notional amount of derivative           $ 250,000,000
Derivatives Designated as Hedging Instruments            
Derivative [Line Items]            
Notional amount of derivative 13,714,000,000 14,728,000,000 13,714,000,000 14,728,000,000    
Derivatives Not Designated as Hedging Instruments            
Derivative [Line Items]            
Notional amount of derivative $ 19,070,000,000 $ 15,938,000,000 $ 19,070,000,000 $ 15,938,000,000    
Maximum | Derivatives Designated as Hedging Instruments            
Derivative [Line Items]            
Maximum planning cycle of hedges (no more than)     2 years      
Maximum | Derivatives Not Designated as Hedging Instruments            
Derivative [Line Items]            
Maximum planning cycle of hedges (no more than)     1 year