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Shareholders' Equity - Shares Repurchased and Reissued (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jul. 24, 2023 | Jan. 31, 2022
Share repurchases |  |  |  |  |
Repurchase of common shares | $ 2,212 | $ 2,095 | $ 2,222 |  |
Stock repurchase program, authorized amount |  |  |  | $ 3,500 | $ 3,000
Remaining balance under stock repurchase program | $ 3,100 |  |  |  |
Shares surrendered upon vesting for income tax obligation (in shares) | 0.3 | 0.3 | 0.3 |  |
Income tax obligations paid on vesting date | $ 99 | $ 99 | $ 69 |  |
Shares reacquired through net settlement of options (in shares) | 0.4 | 0.5 | 1.3 |  |
Aggregate value of shares reacquired through net settlement of options | $ 150 | $ 145 | $ 306 |  |
Treasury shares reissued for restricted stock award grants, performance share units and issuance of shares vested under advisor deferred compensation plans (in shares) | 0.6 | 0.8 | 0.4 |  |
Share repurchase authorization |  |  |  |  |
Share repurchases |  |  |  |  |
Repurchase of common shares (in shares) | 5.9 | 6.6 | 7.1 |  |
Repurchase of common shares | $ 2,000 | $ 1,900 | $ 1,800 |  |

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