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Earnings Per Common Share (EPS) | 9 Months Ended
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Sep. 30, 2017
Earnings Per Share [Abstract] |
Earnings Per Common Share (EPS) | 15. Earnings Per Common Share (EPS) The computations of basic and diluted EPS were as follows:
|  |  |  |  |  | Three Months Ended |  | Nine Months Ended
|  |  |  |  |  | September 30, |  | September 30,
(Millions, except per share amounts) |  | 2017 |  |  | 2016 |  | 2017 |  |  | 2016
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
| Basic and diluted: |  |  |  |  |  |  |  |  |  |  |  |
|  | Net income |  | $ | 1,356 |  | $ | 1,142 |  | $ | 3,933 |  | $ | 4,583
|  | Preferred dividends |  |  | (21) |  |  | (21) |  |  | (61) |  |  | (61)
|  | Net income available to common shareholders |  |  | 1,335 |  |  | 1,121 |  |  | 3,872 |  |  | 4,522
|  | Earnings allocated to participating share awards(a) |  |  | (11) |  |  | (9) |  |  | (32) |  |  | (37)
|  | Net income attributable to common shareholders |  | $ | 1,324 |  | $ | 1,112 |  | $ | 3,840 |  | $ | 4,485
Denominator: (a) |  |  |  |  |  |  |  |  |  |  |  |
| Basic: Weighted-average common stock |  |  | 878 |  |  | 920 |  |  | 889 |  |  | 940
| Add: Weighted-average stock options (b) |  |  | 3 |  |  | 3 |  |  | 3 |  |  | 3
| Diluted |  |  | 881 |  |  | 923 |  |  | 892 |  |  | 943
Basic EPS |  | $ | 1.51 |  | $ | 1.21 |  | $ | 4.32 |  | $ | 4.77
Diluted EPS |  | $ | 1.50 |  | $ | 1.20 |  | $ | 4.30 |  | $ | 4.76
The Company’s unvested restricted stock awards, which include the right to receive non-forfeitable dividends or dividend equivalents, are considered participating securities. Calculations of EPS under the two-class method exclude from the numerator any dividends paid or owed on participating securities and any undistributed earnings considered to be attributable to participating securities. The related participating securities are similarly excluded from the denominator. The dilutive effect of unex ercised stock options excludes from the computation of EPS 0.5 million and 3.2 million of options for the three months ended September 30, 2017 and 2016, respectively, and 0.8 million and 2.2 million of options for the nine months ended September 30, 2017 and 2016, respectively, because inclusion of the options would have been anti-dilutive.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1278-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1252-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=65016374&loc=d3e4984-109258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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