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New accounting pronouncements - Narrative (Detail) - USD ($)
$ in Millions
Jun. 30, 2024
Jan. 01, 2024
Dec. 31, 2023
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Retained earnings $ 650,273   $ 607,350
Cumulative effect, period of adoption, adjustment [Member] | ASU 2023-02 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Retained earnings   $ 127