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Shareholders' Equity - Shares Repurchased and Reissued (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Aug. 31, 2020
Share repurchases |  |  |  |  |
Repurchase of common shares | $ 586 | $ 341 | $ 1,624 | $ 1,135 |
Stock repurchase program, authorized amount |  |  |  |  | $ 2,500
Remaining balance under stock repurchase program | $ 932 |  | $ 932 |  |
Shares surrendered upon vesting for income tax obligation |  |  | 0.3 | 0.3 |
Income tax obligations paid on vesting date |  |  | $ 69 | $ 51 |
Number of shares reacquired through net settlement options |  |  | 0.9 | 0.7 |
Aggregate value of shares reacquired through net settlement options |  |  | $ 209 | $ 128 |
Treasury shares reissued for restricted stock award grants, performance share units and issuance of shares vested under advisor deferred compensation plans |  |  | 0.4 | 0.5 |
Share repurchase authorization |  |  |  |  |
Share repurchases |  |  |  |  |
Repurchase of common shares (in shares) |  |  | 5.5 | 6.3 |
Repurchase of common shares |  |  | $ 1,300 | $ 956 |

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- Definition Represents the aggregate value of shares reacquired through the net settlement of options during the period to cover the strike price and the holders' income tax obligation on vested shares. + References No definition available. + Details
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- Definition Represents the number of shares reacquired through the net settlement of options during the period to cover the strike price and the holders income tax obligation on vested shares. + References No definition available. + Details
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- Definition Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement. + References No definition available. + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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