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Share Repurchases (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Share Repurchases [Line Items]                              
Shares of common stock repurchased                         32,000,000 69,000,000 95,000,000
Share Repurchase Program 2019                              
Share Repurchases [Line Items]                              
Shares of common stock repurchased                       21,000,000      
Value of common stock repurchased                       $ 6,200      
Share Repurchase Program 2019 and 2021                              
Share Repurchases [Line Items]                              
Shares of common stock repurchased                     20,000,000       95,000,000
Value of common stock repurchased                     $ 6,233       $ 28,033
Share Repurchase Program 2021                              
Share Repurchases [Line Items]                              
Shares of common stock repurchased 7,000,000 7,000,000 7,000,000 11,000,000 14,000,000 18,000,000 20,000,000 17,000,000 28,000,000 26,000,000     32,000,000 69,000,000  
Value of common stock repurchased $ 2,800 $ 2,800 $ 2,800 $ 3,560 $ 4,600 $ 4,600 $ 4,600 $ 4,600 $ 7,800 $ 7,800     $ 11,960 $ 18,400