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Shareholders' Equity - Accelerated Share Repurchases (Details) - 2021 Repurchase Program - Morgan Stanley & Co. LLC - USD ($) shares in Millions, $ in Billions	Jan. 04, 2024	Mar. 31, 2024
Equity, Class of Treasury Stock [Line Items]
ASR agreement, amount	$ 3.0	$ 3.0
Payments for ASR, amount	$ 3.0
ASR percent of notional amount received in shares	85.00%
Shares repurchased under ASR agreement (in shares)	31.4	8.3
Transfer of shares to treasury stock value	$ 2.6
ASR, shares to be received at the end of program as a percent of notional amount		15.00%
Forward contract
Equity, Class of Treasury Stock [Line Items]
Forward contract, notional amount	$ 0.4

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