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Common Shares (Tables)

12 Months Ended

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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Tabular disclosure of the change in common stock outstanding.

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