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Financial Instruments - Narrative (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
interest_rate_swap
Mar. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
interest_rate_swap
Jun. 30, 2020
USD ($)
Jan. 31, 2021
USD ($)
interest_rate_swap
Dec. 31, 2020
USD ($)
Derivative [Line Items]            
Pretax net unrealized losses on derivatives maturing within next 12 months estimated to be reclassified from AOCI to sales     $ 52,000,000      
Equity investments without readily determinable fair values $ 694,000,000   694,000,000 $ 487,000,000    
Unrealized gains recognized on investments in equity securities without readily determinable fair value     75,000,000 18,000,000    
Cumulative unrealized gains on investments 244,000,000   244,000,000      
Cumulative unrealized losses on investments 8,000,000   8,000,000      
Payments of contingent consideration     0 106,000,000    
Fair value of loans payable and long-term debt, including current portion 29,500,000,000   29,500,000,000     $ 36,000,000,000.0
Debt, carrying amount 26,500,000,000   26,500,000,000     31,800,000,000
Accounts Receivable, Sale 2,400,000,000 $ 2,100,000,000        
Cash collateral received from counterparties 13,000,000   13,000,000     0
Cash collateral advanced to counterparties 0   0     36,000,000
Total swap notional amount 29,426,000,000   29,426,000,000     32,784,000,000
Unrealized losses recognized on investments in equity securities without readily determinable fair values     1,000,000 $ 3,000,000    
Level 2            
Derivative [Line Items]            
Cash equivalents 7,500,000,000   7,500,000,000     6,800,000,000
Derivatives Designated as Hedging Instruments            
Derivative [Line Items]            
Total swap notional amount 12,755,000,000   $ 12,755,000,000     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 $ 16,671,000,000   $ 16,671,000,000     $ 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   9   5  
Total swap notional amount         $ 1,150,000,000