Share Repurchases (Detail) - Share Repurchase Program 2021 - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2023	Dec. 31, 2022
Share Repurchases [Line Items]
Shares of common stock repurchased	7,000,000	11,000,000	20,000,000	17,000,000	18,000,000	37,000,000
Value of common stock repurchased	$ 2,800	$ 3,560	$ 4,600	$ 4,600	$ 6,360	$ 9,200

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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