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Debt - Narrative (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Mar. 31, 2025
Debt Instrument [Line Items]    
Long-term debt, excluding finance lease liabilities $ 3,100 $ 2,996
Fair value    
Debt Instrument [Line Items]    
Long-term debt, excluding finance lease liabilities 3,500 3,300
Carrying value    
Debt Instrument [Line Items]    
Long-term debt, excluding finance lease liabilities $ 3,800 $ 3,600