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Employee Benefit Plans (Expected Cash Flows, Defined Benefit Pension and Other Post-retirement Benefit Plans) (Details) $ in Millions | Dec. 31, 2017 CAD ($)
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Pension Plan [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Defined Benefit Plans, Estimated Future Employer Contributions in 2017 | $ 97
Defined Benefit Plan, Expected Future Benefit Payments 2018 [Member] | 147
Defined Benefit Plan, Expected Future Benefit Payments 2019 [Member] | 143
Defined Benefit Plan, Expected Future Benefit Payments 2020 [Member] | 148
Defined Benefit Plan, Expected Future Benefit Payments 2021 [Member] | 157
Defined Benefit Plan, Expected Future Benefit Payments 2022 [Member] | 165
Defined Benefit Plan, Expected Future Benefit Payments 2023-2027 [Member] | 912
Non-pension Benefit Plans [Member |
Defined Benefit Plan Disclosure [Line Items] |
Defined Benefit Plans, Estimated Future Employer Contributions in 2017 | 25
Defined Benefit Plan, Expected Future Benefit Payments 2018 [Member] | 22
Defined Benefit Plan, Expected Future Benefit Payments 2019 [Member] | 23
Defined Benefit Plan, Expected Future Benefit Payments 2020 [Member] | 23
Defined Benefit Plan, Expected Future Benefit Payments 2021 [Member] | 23
Defined Benefit Plan, Expected Future Benefit Payments 2022 [Member] | 24
Defined Benefit Plan, Expected Future Benefit Payments 2023-2027 [Member] | $ 124

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- Definition Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of benefits for defined benefit plan expected to be paid in next fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of benefits for defined benefit plan expected to be paid in fifth fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of benefits for defined benefit plan expected to be paid in fourth fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of benefits for defined benefit plan expected to be paid in third fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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