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Preferred Shares (Details Textuals) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 15, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Preferred Shares [Line Items] |  |  |  |  |  |
Preferred shares, authorized (in shares) |  | 20,000,000 |  | 20,000,000 |  | 20,000,000
Preferred shares, par value (in dollars per share) |  | $ 1.667 |  | $ 1.667 |  | $ 1.667
Liquidation price per share (in dollars per share) |  | 1,000,000 |  | 1,000,000 |  |
Depositary shares, redemption amount (in dollars per share) |  | $ 1,000 |  | $ 1,000 |  |
Equity adjustments in connection with redemption of Preferred Shares | $ 9 | $ 9 | $ 0 | $ 9 | $ 0 |
Series C Preferred Stock |  |  |  |  |  |
Preferred Shares [Line Items] |  |  |  |  |  |
Payments for redemption of preferred stock | $ 850 |  |  |  |  |
Fixed dividend rate per annum (as a percent) | 4.90% |  |  |  |  |
Series B Preferred Stock |  |  |  |  |  |
Preferred Shares [Line Items] |  |  |  |  |  |
Preferred shares, par value (in dollars per share) |  | $ 1.667 |  | $ 1.667 |  |
Fixed dividend rate per annum (as a percent) |  |  |  | 5.20% |  |
Series D Preferred Stock |  |  |  |  |  |
Preferred Shares [Line Items] |  |  |  |  |  |
Preferred shares, par value (in dollars per share) |  | $ 1.667 |  | $ 1.667 |  |
Fixed dividend rate per annum (as a percent) |  |  |  | 3.55% |  |

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- Definition Preferred Shares [Line Items] + References No definition available. + Details
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- Definition The cash outflow for reacquisition of callable preferred stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 + Details
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- Definition The percentage rate used to calculate dividend payments on preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 + Details
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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + 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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- Definition The excess of (1) fair value of the consideration transferred to the holders of the preferred stock over (2) the carrying amount of the preferred stock in the registrant's balance sheet, during the accounting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section S99 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=122038299&loc=d3e42851-122695 + Details
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- Definition The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21488-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21564-112644 + Details
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + 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 + Details
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