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Financial Instruments - Narrative (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
interest_rate_swap
Sep. 30, 2021
USD ($)
interest_rate_swap
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Jan. 31, 2021
USD ($)
interest_rate_swap
Derivative [Line Items]          
Total swap notional amount $ 28,458,000,000 $ 28,458,000,000   $ 32,784,000,000  
Pretax net unrealized gains on derivatives maturing within next 12 months estimated to be reclassified from AOCI to sales   55,000,000      
Equity investments without readily determinable fair values 578,000,000 578,000,000 $ 508,000,000    
Unrealized gains recognized on investments in equity securities without readily determinable fair value   104,000,000 21,000,000    
Unrealized losses recognized on investments in equity securities without readily determinable fair values   1,000,000 $ 3,000,000    
Cumulative unrealized gains on investments 229,000,000 229,000,000      
Cumulative unrealized losses on investments 7,000,000 7,000,000      
Fair value of loans payable and long-term debt, including current portion 29,100,000,000 29,100,000,000   36,000,000,000  
Debt, carrying amount 26,400,000,000 26,400,000,000   31,800,000,000  
Factored accounts receivable 2,400,000,000     2,100,000,000  
Cash collateral received from counterparties 65,000,000 65,000,000   0  
Cash collateral advanced to counterparties 0 0   36,000,000  
Level 2          
Derivative [Line Items]          
Cash equivalents 9,200,000,000 9,200,000,000   6,800,000,000  
Derivatives Designated as Hedging Instruments          
Derivative [Line Items]          
Total swap notional amount 12,603,000,000 $ 12,603,000,000   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 $ 15,855,000,000 $ 15,855,000,000   $ 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         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