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property, plant and equipment (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
property, plant and equipment    
Property, plant and equipment at beginning of period $ 11,368  
Depreciation 1,669 $ 1,617
Property, plant and equipment at end of period 12,091 11,368
Additions in respect of asset retirement obligations (15) 7
Contractual commitments for the acquisition of property, plant and equipment 177 184
Network assets    
property, plant and equipment    
Property, plant and equipment at beginning of period 9,086  
Property, plant and equipment at end of period 9,656 9,086
Additions in respect of assets under finance lease 100 0
Buildings and leasehold improvements    
property, plant and equipment    
Property, plant and equipment at beginning of period 1,193  
Property, plant and equipment at end of period 1,223 1,193
Other    
property, plant and equipment    
Property, plant and equipment at beginning of period 386  
Property, plant and equipment at end of period 385 386
Additions in respect of assets under finance lease 1 0
Land    
property, plant and equipment    
Property, plant and equipment at beginning of period 48  
Property, plant and equipment at end of period 48 48
Assets under construction    
property, plant and equipment    
Property, plant and equipment at beginning of period 655  
Property, plant and equipment at end of period 779 655
Cost/Gross amount    
property, plant and equipment    
Property, plant and equipment at beginning of period 33,599 32,906
Additions 2,368 2,493
Additions arising from business acquisitions 26 42
Dispositions, retirements and other (763) (1,842)
Property, plant and equipment at end of period 35,230 33,599
Cost/Gross amount | Network assets    
property, plant and equipment    
Property, plant and equipment at beginning of period 28,724 28,284
Additions 1,039 972
Additions arising from business acquisitions 4 25
Dispositions, retirements and other (767) (1,724)
Assets under construction put into service 956 1,167
Property, plant and equipment at end of period 29,956 28,724
Cost/Gross amount | Buildings and leasehold improvements    
property, plant and equipment    
Property, plant and equipment at beginning of period 3,077 2,954
Additions 27 51
Additions arising from business acquisitions 13 8
Dispositions, retirements and other 56 (63)
Assets under construction put into service 100 127
Property, plant and equipment at end of period 3,273 3,077
Cost/Gross amount | Other    
property, plant and equipment    
Property, plant and equipment at beginning of period 1,095 1,021
Additions 37 44
Additions arising from business acquisitions 9 9
Dispositions, retirements and other (52) (48)
Assets under construction put into service 85 69
Property, plant and equipment at end of period 1,174 1,095
Cost/Gross amount | Land    
property, plant and equipment    
Property, plant and equipment at beginning of period 48 55
Dispositions, retirements and other   (7)
Property, plant and equipment at end of period 48 48
Cost/Gross amount | Assets under construction    
property, plant and equipment    
Property, plant and equipment at beginning of period 655 592
Additions 1,265 1,426
Assets under construction put into service (1,141) (1,363)
Property, plant and equipment at end of period 779 655
Accumulated depreciation    
property, plant and equipment    
Property, plant and equipment at beginning of period (22,231) (22,442)
Depreciation 1,669 1,617
Dispositions, retirements and other 761 1,828
Property, plant and equipment at end of period (23,139) (22,231)
Accumulated depreciation | Network assets    
property, plant and equipment    
Property, plant and equipment at beginning of period (19,638) (19,950)
Depreciation 1,431 1,396
Dispositions, retirements and other 769 1,708
Property, plant and equipment at end of period (20,300) (19,638)
Accumulated depreciation | Buildings and leasehold improvements    
property, plant and equipment    
Property, plant and equipment at beginning of period (1,884) (1,836)
Depreciation 115 106
Dispositions, retirements and other (51) 58
Property, plant and equipment at end of period (2,050) (1,884)
Accumulated depreciation | Other    
property, plant and equipment    
Property, plant and equipment at beginning of period (709) (656)
Depreciation 123 115
Dispositions, retirements and other 43 62
Property, plant and equipment at end of period $ (789) $ (709)