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Shareholders' Equity - Accelerated Share Repurchases (Details) - 2021 Repurchase Program - USD ($) shares in Millions, $ in Billions | Jan. 04, 2024 | Jan. 04, 2023 | Mar. 31, 2024 | Feb. 28, 2023
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Morgan Stanley & Co. LLC |  |  |  |
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% |
Morgan Stanley & Co. LLC | Forward contract |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Forward contract, notional amount | $ 0.4 |  |  |
Citibank, N.A. |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
ASR agreement, amount |  | $ 2.0 |  | $ 2.0
Payments for ASR, amount |  | $ 2.0 |  |
ASR percent of notional amount received in shares |  | 80.00% |  |
Shares repurchased under ASR agreement (in shares) |  | 17.4 |  | 5.4
Transfer of shares to treasury stock value |  | $ 1.6 |  |
ASR, shares to be received at the end of program as a percent of notional amount |  |  |  | 20.00%
Citibank, N.A. | Forward contract |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Forward contract, notional amount |  | $ 0.4 |  |

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