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Restructuring, Transaction, and Integration expenses
 3 Months Ended
Sep. 30, 2025
Restructuring, Transaction, and Integration Expenses [Abstract]  
Restructuring, Transaction, and Integration Expenses Restructuring, Transaction, and Integration Expenses, Net
    Restructuring, transaction and integration expenses, net, as reported on the unaudited condensed consolidated statements of income are summarized as follows:
Three Months Ended September 30,
($ in millions)20252024
Transaction costs$(22)$— 
Restructuring, integration and related expenses, net (1)(53)(6)
Restructuring, transaction, and integration expenses, net$(75)$(6)
(1)Includes restructuring and related expenses of $45 million and integration costs of $8 million for the three months ended September 30, 2025. The three months ended September 30, 2024, includes restructuring and related expenses of $6 million.

    Transaction costs include advisory services, financing-related, legal, and other costs associated with the Merger. Refer to Note 3, "Acquisitions."

    Refer to Note 5, "Restructuring" for information on restructuring, integration and other related expenses, net.