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Debt - Credit Facilities (Details)
Dec. 31, 2023
USD ($)
facility
Line of credit | Line of credit  
Debt  
Maximum borrowing capacity $ 1,810,000,000
Number of separate facilities | facility 4
Letter of credit  
Debt  
Maximum borrowing capacity $ 960,000,000
Available borrowing capacity 957,000,000
Letter of credit | Variable Rate Demand Obligation  
Debt  
Available borrowing capacity 2,504,000
Commercial paper  
Debt  
Line of credit, amount outstanding $ 611,000,000