v3.22.0.1
Debt (Narrative) (Details)
1 Months Ended
Apr. 30, 2021
USD ($)
Tranche
Dec. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]        
Commercial paper outstanding   $ 0   $ 0
Estimated fair value of long-term debt   12,400,000,000   14,000,000,000.0
Commercial Paper        
Debt Instrument [Line Items]        
Maximum borrowing on short term lines of credit   10,000,000,000 $ 5,000,000,000  
Revolving Credit Facility        
Debt Instrument [Line Items]        
Maximum borrowing on short term lines of credit   10,000,000,000    
Line of credit drawn   $ 0   $ 0
Number of instruments issued | Tranche 2      
Revolving Credit Facility | Credit Facility Due July 2023        
Debt Instrument [Line Items]        
Maximum borrowing on short term lines of credit $ 4,000,000,000      
Revolving Credit Facility | Credit Facility Due April 2022        
Debt Instrument [Line Items]        
Maximum borrowing on short term lines of credit 4,000,000,000      
Revolving Credit Facility | Credit Facility Due April 2026        
Debt Instrument [Line Items]        
Maximum borrowing on short term lines of credit $ 6,000,000,000