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Long-Term Debt and Revolving Credit Arrangements - Letters of Credit, Narrative (Details) - Line of Credit - Letters of Credit - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Letters of credit outstanding $ 1,400 $ 975
Letters of credit outstanding that will reduce the available credit under facilities $ 354 $ 287