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Financial Instruments, Hedging Activities and Fair Value Measurements (Additional Information) (Details)
$ in Millions, € in Billions
 9 Months Ended 12 Months Ended
Sep. 30, 2021
EUR (€)
Dec. 31, 2020
EUR (€)
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Derivative Instruments and Hedging Activities Disclosure [Line Items]                    
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Assets, Fair Value, Net     $ 38     $ 8        
Fair Value of Debt Instrument Designated as a Hedge of Net Investment in Foreign Operations     2,300     2,400        
Accumulated pretax unrealized translation gains (losses) in AOCI, related to both the euro-denominated borrowings and the cross currency swaps that have been designated as hedges of net investments     6,410 $ 6,411 $ 5,969 5,815 $ 5,424 $ 4,938 $ 4,837 $ 5,403
Long-term Debt     6,780     5,334        
Long-lived assets fair value amount     7,018     5,913        
Finance Lease, Liability     10     12        
Short-term debt     6     403        
Interest rate swaps                    
Derivative Instruments and Hedging Activities Disclosure [Line Items]                    
Derivative, Notional Amount     525              
Interest Rate Derivatives, at Fair Value, Net           67 $ 44      
Cross currency swaps                    
Derivative Instruments and Hedging Activities Disclosure [Line Items]                    
Derivative, Notional Amount     775     875        
Foreign currency forward contracts                    
Derivative Instruments and Hedging Activities Disclosure [Line Items]                    
Derivative, Notional Amount     1,800     1,400        
Foreign Currency Contracts, Liability, Fair Value Disclosure     31     2        
Foreign currency forward contracts | Accounts payable and accrued liabilities | Level 1 | Not Designated as Hedging Instrument                    
Derivative Instruments and Hedging Activities Disclosure [Line Items]                    
Derivative liabilities     0     0        
Foreign currency forward contracts | Accounts payable and accrued liabilities | Level 2 | Not Designated as Hedging Instrument                    
Derivative Instruments and Hedging Activities Disclosure [Line Items]                    
Derivative liabilities     33     6        
Foreign currency forward contracts | Accounts payable and accrued liabilities | Level 3 | Not Designated as Hedging Instrument                    
Derivative Instruments and Hedging Activities Disclosure [Line Items]                    
Derivative liabilities     0     0        
Net Investment Hedging                    
Derivative Instruments and Hedging Activities Disclosure [Line Items]                    
Long-term Debt | € € 2.0 € 2.0                
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest                    
Derivative Instruments and Hedging Activities Disclosure [Line Items]                    
Accumulated pretax unrealized translation gains (losses) in AOCI, related to both the euro-denominated borrowings and the cross currency swaps that have been designated as hedges of net investments     $ 144     $ 22