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Segment Information (Geographical) (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues, Total	$ 6,226	$ 4,277
Noncurrent Assets	16,995	17,290
CA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues, Total	1,464	1,510
Noncurrent Assets	3,995	3,791
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues, Total	4,328	2,348
Noncurrent Assets	12,257	12,724
BARBADOS
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues, Total	280	254
Noncurrent Assets	408	416
BAHAMAS
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues, Total	119	121
Noncurrent Assets	276	295
DOMINICA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues, Total	35	44
Noncurrent Assets	$ 59	$ 64

X

- Definition

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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