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Borrowings - Lines of Credit (Details)
$ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
Five-Year Credit Agreement  
Lines of Credit  
Amount of credit facility $ 10,250
Credit facility term 5 years
364-Day Credit Agreement  
Lines of Credit  
Amount of credit facility $ 2,500
Credit facility term 364 days
Three-Year Credit Agreement  
Lines of Credit  
Amount of credit facility $ 2,500
Credit facility term 3 years
Credit Facilities  
Lines of Credit  
Borrowings outstanding $ 0