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Dividends Declared (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
Equity [Abstract]            
Declaration Date Dec. 07, 2021 Sep. 14, 2021 Dec. 02, 2020 Sep. 15, 2020    
Record Date Feb. 17, 2022 Nov. 18, 2021 Feb. 18, 2021 Nov. 19, 2020    
Payment Date Mar. 10, 2022 Dec. 09, 2021 Mar. 11, 2021 Dec. 10, 2020    
Dividend Per Share $ 0.62 $ 0.62 $ 0.56 $ 0.56 $ 1.24 $ 1.12
Amount $ 4,650 $ 4,652 $ 4,221 $ 4,230 $ 9,302 $ 8,451