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financial instruments - Credit risk (Details) - CAD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Credit risk
Maximum exposure (excluding income tax effects) to credit risk	$ 3,435	$ 3,300	$ 2,963
Cash and temporary investments, net
Credit risk
Maximum exposure (excluding income tax effects) to credit risk	414	509	432
Customer accounts receivable
Credit risk
Maximum exposure (excluding income tax effects) to credit risk	1,600	1,614	1,462
Contract assets
Credit risk
Maximum exposure (excluding income tax effects) to credit risk	1,318	1,153	1,052
Derivatives
Credit risk
Maximum exposure (excluding income tax effects) to credit risk	$ 103	$ 24	$ 17

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The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]]

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