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Net Investment in Direct Financing Lease (Direct Financing Lease and Future Minimum Capital Lease Payments) (Details) - CAD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Capital Leases, Net Investment in Direct Financing Leases [Abstract]
Capital Leases, Net Investment in Direct Financing Leases, Minimum Payments to be Received	$ 1,126	$ 1,194
Capital Leases, Net Investment in Direct Financing Leases, Executory Costs	(211)	(223)
Minimum lease payments receivable	915	971
Capital Leases, Net Investment in Direct Financing Leases, Unguaranteed Residual Values of Leased Property	183	183
Capital Leases, Net Investment in Direct Financing Leases, Deferred Income	(609)	(658)
Capital Leases, Net Investment in Direct Financing Leases, Total	489	496
Capital Leases, Lessor Balance Sheet, Net Investment in Direct Financing Leases, Current	8	8
Capital Leases, Lessor Balance Sheet, Net Investment in Direct Financing Leases, Noncurrent	481	$ 488
Capital Leases, Future Minimum Payments Receivable, Fiscal Year Maturity [Abstract]
Capital Leases, Future Minimum Payments, Receivable in 2018	64
Capital Leases, Future Minimum Payments, Receivable in 2019	64
Capital Leases, Future Minimum Payments, Receivable in 2020	64
Capital Leases, Future Minimum Payments, Receivable in 2021	65
Capital Leases, Future Minimum Payments, Receivable in 2022	64
Capital Leases, Future Minimum Payments, estimated executory costs, Fiscal Year Maturity [Abstract]
Capital Leases, Future Minimum Payments, estimated executory costs 2018	(11)
Capital Leases, Future Minimum Payments, estimated executory costs 2019	(11)
Capital Leases, Future Minimum Payments, estimated executory costs 2020	(11)
Capital Leases, Future Minimum Payments, estimated executory costs 2021	(12)
Capital Leases, Future Minimum Payments, estimated executory costs 2022	(12)
Capital Leases, Future Minimum Payments, estimated executory costs 2021
Capital Leases, Future Minimum Payments Receivable Net of Executory Costs 2018	53
Capital Leases, Future Minimum Payments Receivable Net of Executory Costs 2019	53
Capital Leases, Future Minimum Payments Receivable Net of Executory Costs 2020	53
Capital Leases, Future Minimum Payments Receivable Net of Executory Costs 2021	53
Capital Leases, Future Minimum Payments Receivable Net of Executory Costs 2022	$ 52

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Amount of executory costs to be paid by the lessor for capital leases in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of executory costs to be paid by the lessor for capital leases in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of executory costs to be paid by the lessor for capital leases in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of executory costs to be paid by the lessor for capital leases in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments to be received net of executory costs by the lessor for capital leases in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments to be received net of executory costs by the lessor for capital leases in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments to be received net of executory costs by the lessor for capital leases in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of executory costs to be paid by the lessor for capital leases in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of remaining payments as of the balance sheet date that lessees are obligated to make or can be required to make under direct financing leases, net of executory costs.

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Amount of minimum lease payments to be received by the lessor for capital leases in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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The net amount due within one year of the balance sheet date or the normal operating cycle, if longer, consisting of: (a) minimum lease payments due on direct financing leases, (b) unguaranteed residual value, and (c) any unamortized initial direct costs, less: (i) executory costs, (ii) unearned income, and (iii) the accumulated allowance for uncollectible minimum lease payments.

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The net amount due after one year of the balance sheet date or beyond the normal operating cycle, if longer, consisting of: (a) minimum lease payments due on direct financing leases, (b) unguaranteed residual value, and (c) any unamortized initial direct costs; less: (i) executory costs, (ii) unearned income, and (iii) the accumulated allowance for uncollectible minimum lease payments.

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The net investment in direct financing leases as of the balance sheet date consisting of: (a) minimum lease payments due on direct financing leases, (b) unguaranteed residual value, and (c) any unamortized initial direct costs; less: (i) executory costs, (ii) unearned income, and (iii) the accumulated allowance for uncollectible minimum lease payments.

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The remaining (unamortized) difference between the gross investment in a direct financing lease and the cost or carrying amount, if different, of the leased property as of the balance sheet date.

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Estimated remaining costs to be incurred to service the direct financing lease, such as taxes, maintenance and insurance and the profit thereon, that are included in the minimum lease payments.

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Amount of remaining payments as of the balance sheet date that lessees are obligated to make or can be required to make under direct financing leases, including any guarantee of residual value and executory costs. The amount also includes any guaranteed rental payments by an unrelated third-party provided that are financially capable of making such payments.

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The estimate of the lease property's economic value at the end of the direct financing lease term excluding any amounts guaranteed by either the lessee or a third-party.

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