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Shareholders' Equity (Details) - USD ($) $ in Millions | 4 Months Ended | 8 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | May 31, 2021 | Jun. 30, 2018
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |
Purchase for treasury | $ 1,000.0 | $ 250.0 | $ 1,250.0 | $ 500.0 | $ 4,400.0 |  |
Stock repurchase program, authorized amount |  |  |  |  |  | $ 5,000.0 | $ 8,000.0
Remaining authorized repurchase amount |  | $ 4,750.0 | $ 4,750.0 |  |  |  |
Preferred stock, shares authorized (in shares) |  | 5,000,000 | 5,000,000 |  |  |  |
Shares issued (in shares) |  | 0 | 0 | 0 |  |  |
Shares held in employee trust (in shares) |  | 50,000,000 | 50,000,000 | 50,000,000 |  |  |
Employee benefit trust |  | $ 3,013.2 | $ 3,013.2 | $ 3,013.2 |  |  |

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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 + Details
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