Accounts Payable and Accrued Liabilities (Details) - CAD CAD in Millions	Dec. 31, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Trade payables	CAD 339	CAD 407
Accrued charges	353	324
Income and other taxes payable	218	95
Accrued interest	147	75
Payroll-related accruals	88	72
Accrued vacation	69	66
Dividends payable	53	58
Personal injury and other claims provision	30	45
Purchase of CP Common Shares	0	39
Provision for environmental remediation	13	16
Stock-based compensation liabilities	48	14
Provision for restructuring	6	11
Other	53	55
Total accounts payable and accrued liabilities	CAD 1,417	CAD 1,277