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Debt (Availability Under the Revolving Credit Facility) (Details) - Revolving Credit Facility, expiring October 2027
$ in Millions
Mar. 31, 2023
USD ($)
Line Of Credit Facility [Line Items]  
Amounts outstanding $ 449
Net availability 551
Revolving Credit Facility  
Line Of Credit Facility [Line Items]  
Total availability 1,000
Amounts outstanding 410
Letter of credit  
Line Of Credit Facility [Line Items]  
Amounts outstanding $ 39