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Common and Preferred Shares (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Authorized shares and a reconciliation of common shares issued and outstanding | The following table shows authorized shares and provides a reconciliation of common shares issued and outstanding for the years ended December 31:
(Millions, except where indicated) |  | 2020 |  | 2019 |  | 2018
Common shares authorized (billions)(a) |  | 3.6 |  |  | 3.6 |  |  | 3.6 |
Shares issued and outstanding at beginning of year |  | 810 |  |  | 847 |  |  | 859 |
Repurchases of common shares |  | (7) |  |  | (40) |  |  | (15) |
Other, primarily stock option exercises and restricted stock awards granted |  | 2 |  |  | 3 |  |  | 3 |
Shares issued and outstanding as of December 31 |  | 805 |  |  | 810 |  |  | 847 |
(a)Of the common shares authorized but unissued as of December 31, 2020, approximately 23 million shares are reserved for issuance under employee stock and employee benefit plans.
Perpetual Fixed Rate Noncumulative Preferred Shares issued and outstanding | We have the following perpetual Fixed Rate/Floating Rate Noncumulative Preferred Share series issued and outstanding as of December 31, 2020:
|  | Series B |  | Series C
Issuance date |  | November 10, 2014 |  | March 2, 2015
Securities issued |  | 750 Preferred Shares; represented by 750,000 depositary shares |  | 850 Preferred Shares; represented by 850,000 depositary shares
Aggregate liquidation preference |  | $750 million |  | $850 million
Fixed dividend rate per annum |  | 5.20% |  | 4.90%
Semi-annual fixed dividend payment dates |  | Beginning May 15, 2015 |  | Beginning September 15, 2015
Floating dividend rate per annum |  | 3 month LIBOR+ 3.428% |  | 3 month LIBOR+ 3.285%
Quarterly floating dividend payment dates |  | Beginning February 15, 2020 |  | Beginning June 15, 2020
Fixed to floating rate conversion date(a) |  | November 15, 2019 |  | March 15, 2020
(a)The date on which dividends convert from a fixed-rate calculation to a floating rate calculation.

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- Definition Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65888546&loc=d3e21300-112643 Reference 2: 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 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21553-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65877616&loc=d3e177068-122764 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 7: 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(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21488-112644 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 11: 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(27)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21484-112644 Reference 13: 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=109259400&loc=d3e21475-112644 + Details
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