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Short-term Borrowings and Long-term Debt (Details) - Domestic Line of Credit - USD ($)
1 Months Ended
Apr. 30, 2021
Jul. 31, 2021
Jan. 31, 2021
Debt Instrument [Line Items]      
Committed line of credit   $ 15,000,000,000 $ 15,000,000,000
Revolving Credit Facility      
Debt Instrument [Line Items]      
Debt instrument, term 364 days    
Debt outstanding   10,000,000,000  
Five Year Credit Facility      
Debt Instrument [Line Items]      
Debt instrument, term 5 years    
Committed line of credit   $ 5,000,000,000