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Common Shares (Tables) | 12 Months Ended
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Dec. 31, 2016
Equity [Abstract] |
Schedule of Common Shares Issued During the Year | Common shares issued during the year were as follows.
| 2016 | 2015
| Number |  |  | Number |  |
| of Shares |  | Amount |  | of Shares |  | Amount |
| (in thousands) |  | (in millions) |  | (in thousands) |  | (in millions) |
Balance, beginning of year | 281,562 |  | $ | 5,867 |  | 275,997 |  | $ | 5,667 |
Public Offering | 114,364 |  | 4,684 |  | — |  | — |
Dividend Reinvestment Plan | 4,100 |  | 163 |  | 4,272 |  | 157 |
Consumer Share Purchase Plan | 31 |  | 1 |  | 28 |  | 1 |
Employee Share Purchase Plan | 377 |  | 15 |  | 356 |  | 13 |
Stock Option Plans | 1,042 |  | 32 |  | 885 |  | 28 |
Conversion of Convertible Debentures | 10 |  | — |  | 24 |  | 1 |
Balance, end of year | 401,486 |  | $ | 10,762 |  | 281,562 |  | $ | 5,867 |

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- Definition Tabular disclosure of the change in common stock outstanding. + References No definition available. + Details
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