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Earnings Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2016
Earnings Per Share [Abstract] |
Schedule of Net Earnings to Common Shareholders |
| 2016 | 2015
| Net Earnings |  | Weighted |  |  | Net Earnings |  | Weighted |  |
| to Common |  | Average |  |  | to Common |  | Average |  |
| Shareholders |  | Shares |  |  | Shareholders |  | Shares |  |
| ($ millions) | (# millions) | EPS |  | ($ millions) |  | (# millions) |  | EPS |
Basic EPS | $ | 585 |  | 308.9 |  | $ | 1.89 |  | $ | 728 |  | 278.6 |  | $ | 2.61 |
Effect of potential dilutive securities: |  |  |  |  |  |
Stock Options | — |  | 0.7 |  |  | — |  | 0.7 |  |
Preference Shares | 7 |  | 3.8 |  |  | 10 |  | 5.4 |  |
Diluted EPS | $ | 592 |  | 313.4 |  | $ | 1.89 |  | $ | 738 |  | 284.7 |  | $ | 2.59 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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