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Earnings Per Common Share (Tables)

12 Months Ended

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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- References

No definition available.

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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

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