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Credit Facility (Details) - Credit Facility
$ in Millions
3 Months Ended
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Line of Credit Facility [Line Items]    
Borrowing limit [1] $ 500  
Amount outstanding at period end [2] $ 11  
Number of extension you can request 2  
Available $ 489  
Direct advances on the credit facility outstanding $ 0 $ 0
[1] Expires in June 2024.
[2] Includes outstanding commercial paper and letters of credit.