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Financial Instruments - Narrative (Details)
 3 Months Ended
Mar. 31, 2021
USD ($)
interest_rate_swap
Dec. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Jan. 31, 2021
USD ($)
interest_rate_swap
Derivative [Line Items]        
Pretax net unrealized losses on derivatives maturing within next 12 months estimated to be reclassified from AOCI to sales $ 72,000,000      
Equity investments without readily determinable fair values 651,000,000   $ 450,000,000  
Unrealized gains recognized on investments in equity securities without readily determinable fair value 33,000,000      
Cumulative unrealized gains on investments 202,000,000      
Cumulative unrealized losses on investments 11,000,000      
Payments of contingent consideration 0   $ 106,000,000  
Fair value of loans payable and long-term debt, including current portion 33,500,000,000 $ 36,000,000,000.0    
Debt, carrying amount 31,300,000,000 31,800,000,000    
Accounts Receivable, Sale 1,800,000,000 2,300,000,000    
Cash collateral received from counterparties 19,000,000 0    
Cash collateral advanced to counterparties 0 36,000,000    
Total swap notional amount 33,995,000,000 32,784,000,000    
Level 2        
Derivative [Line Items]        
Cash equivalents 6,000,000,000.0 6,800,000,000    
Derivatives Designated as Hedging Instruments        
Derivative [Line Items]        
Total swap notional amount $ 13,230,000,000 13,714,000,000    
Derivatives Designated as Hedging Instruments | Maximum        
Derivative [Line Items]        
Maximum average period of maturities of contracts in years (less than) 2 years      
Derivatives Not Designated as Hedging Instruments        
Derivative [Line Items]        
Total swap notional amount $ 20,765,000,000 $ 19,070,000,000    
Derivatives Not Designated as Hedging Instruments | Maximum        
Derivative [Line Items]        
Maximum average period of maturities of contracts in years (less than) 1 year      
3.875% Notes Due 2021 [Member]        
Derivative [Line Items]        
Face amount of debt       $ 1,150,000,000
Stated interest rate (as percent)       3.875%
Interest rate swap contracts        
Derivative [Line Items]        
Number of interest rate swaps held (in interest rate swaps) | interest_rate_swap 9     5
Total swap notional amount       $ 1,150,000,000