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Share Repurchases (Detail) - Share Repurchase Program 2021 - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Dec. 31, 2024
Dec. 31, 2023
Share Repurchase Program [Line Items]            
Shares of common stock repurchased 8,000,000 7,000,000 7,000,000 11,000,000 15,000,000 18,000,000
Value of common stock repurchased $ 3,500 $ 2,800 $ 2,800 $ 3,560 $ 6,300 $ 6,360