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Debt And Credit Facilities (Details)
$ / shares in Units, $ in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CAD ($)
$ / shares
Jun. 30, 2017
USD ($)
Jun. 30, 2017
CAD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2017
CAD ($)
Nov. 30, 2017
Jun. 30, 2017
CAD ($)
Feb. 05, 2016
Feb. 04, 2016
Disclosure of detailed information about borrowings [line items]                            
Commercial papers issued                 $ 3,231.0 $ 2,136.0        
Interest rate on notes 5.40%   5.50%           5.40% 5.50%        
Finance leases                 $ 1,260.0 $ 1,319.0        
Deferred financing costs                 (41.0) (44.0)        
Longterm borrowings net of deferred financing costs                 14,119.0 13,443.0        
Current portion of longterm debt                            
Current finance leases                 (38.0) (71.0)        
Long - term debt                 (191.0)          
Current portion of long-term debt                 (229.0) (71.0)        
Long-term Debt                 $ 13,890.0 13,372.0        
Additional information                            
Long-term debt repaid             $ 186.0 $ 3,283.0            
Loss on extinguishment of long-term debt             $ 3.0 113.0            
Realized Gain on Foreign Currency Hedges               $ 62.0            
Minimum                            
Additional information                            
Finance lease interest rate 2.9               2.9          
Maximum                            
Additional information                            
Finance lease interest rate 16.5               16.5          
Commercial paper                            
Disclosure of detailed information about borrowings [line items]                            
Commercial papers issued                 $ 3,231.0 $ 2,136.0        
Commercial paper | Maximum                            
Disclosure of detailed information about borrowings [line items]                            
Commercial paper authorized to be issued                 $ 5,000.0          
Commercial paper term             365 days              
Commercial paper | Weighted average                            
Disclosure of detailed information about borrowings [line items]                            
Interest rate on notes 2.88%   1.56%           2.88% 1.56%        
Fixed Term Notes                            
Disclosure of detailed information about borrowings [line items]                            
total unsecured long term debt                 $ 12,900.0 $ 12,168.0        
Notes 6.05 Percent Due 2018                            
Additional information                            
Long-term debt repaid     $ 600.0                      
Book value                   771.0        
Original borrowings maturity amount     614.0             788.0        
Accrued interest     $ 3.0             4.0        
Notes 6.10 Percent Due 2018                            
Additional information                            
Long-term debt repaid         $ 1,250.0                  
Book value                       $ 1,700.0    
Original borrowings maturity amount         1,344.0             1,830.0    
Accrued interest         $ 31.0             $ 42.0    
Loss on extinguishment of long-term debt           $ 25.0                
Loss on debt extinguishment, net of tax           10.0                
Realized Gain on Foreign Currency Hedges           $ 62.0                
5.80% Series 4 Medium Term Notes, due 2018                            
Additional information                            
Long-term debt repaid       $ 700.0                    
Original borrowings maturity amount                   715.0        
Accrued interest                   $ 3.0        
Loss on extinguishment of long-term debt       26.0                    
Loss on debt extinguishment, net of tax       $ 18.0                    
Notes 7.75 Percent Due 2019                            
Disclosure of detailed information about borrowings [line items]                            
Interest rate on notes 7.75%   7.75%           7.75% 7.75%        
total unsecured long term debt                 $ 191.0 $ 288.0        
Additional information                            
Long-term debt repaid $ 83.0                          
Book value                 109.0          
Original borrowings maturity amount 88.0               116.0          
Accrued interest $ 3.0               $ 4.0          
Loss on extinguishment of long-term debt   $ 3.0                        
Loss on debt extinguishment, net of tax   $ 2.0                        
3.10% Series 5 Medium Term Notes, due 2021                            
Disclosure of detailed information about borrowings [line items]                            
Interest rate on notes 3.10%   3.10%           3.10% 3.10%        
total unsecured long term debt                 $ 749.0 $ 749.0        
Debentures 9.25 Percent Due 2021                            
Disclosure of detailed information about borrowings [line items]                            
Interest rate on notes 9.25%   9.25%           9.25% 9.25%        
total unsecured long term debt $ 300.0   $ 300.0           $ 431.0 $ 406.0        
Notes 9.40 Percent Due 2021                            
Disclosure of detailed information about borrowings [line items]                            
Interest rate on notes 9.40%   9.40%           9.40% 9.40%        
total unsecured long term debt                 $ 315.0 $ 298.0        
Additional information                            
Revised debt coupon rate following ratings downgrade by Moodys                         9.40% 7.90%
Notes 4.50 Percent Due 2022                            
Disclosure of detailed information about borrowings [line items]                            
Interest rate on notes 4.50%   4.50%           4.50% 4.50%        
total unsecured long term debt                 $ 234.0 $ 212.0        
Notes 3.60 Percent Due 2024                            
Disclosure of detailed information about borrowings [line items]                            
Interest rate on notes 3.60%   3.60%           3.60% 3.60%        
total unsecured long term debt $ 750.0   $ 750.0           $ 1,020.0 $ 936.0        
3.00% Series 5 Medium Term Notes, due 2026                            
Disclosure of detailed information about borrowings [line items]                            
Interest rate on notes 3.00%   3.00%           3.00% 3.00%        
total unsecured long term debt                 $ 698.0 $ 698.0        
Debentures 7.875 Percent Due 2026                            
Disclosure of detailed information about borrowings [line items]                            
Interest rate on notes 7.875%   7.875%           7.875% 7.875%        
total unsecured long term debt $ 275.0   $ 275.0           $ 393.0 $ 365.0        
Notes 8.20 Percent Due 2027                            
Disclosure of detailed information about borrowings [line items]                            
Interest rate on notes 8.20%   8.20%           8.20% 8.20%        
total unsecured long term debt                 $ 87.0 $ 81.0        
Debentures 7.00 Percent Due 2028                            
Disclosure of detailed information about borrowings [line items]                            
Interest rate on notes 7.00%   7.00%           7.00% 7.00%        
total unsecured long term debt $ 250.0   $ 250.0           $ 346.0 $ 319.0        
Notes 7.15 Percent Due 2032                            
Disclosure of detailed information about borrowings [line items]                            
Interest rate on notes 7.15%   7.15%           7.15% 7.15%        
total unsecured long term debt $ 500.0   $ 500.0           $ 681.0 $ 626.0        
Notes 5.35 Percent Due 2033                            
Disclosure of detailed information about borrowings [line items]                            
Interest rate on notes 5.35%   5.35%           5.35% 5.35%        
total unsecured long term debt $ 300.0   $ 300.0           $ 379.0 $ 344.0        
Notes 5.95 Percent Due 2034                            
Disclosure of detailed information about borrowings [line items]                            
Interest rate on notes 5.95%   5.95%           5.95% 5.95%        
total unsecured long term debt $ 500.0   $ 500.0           $ 680.0 $ 625.0        
Notes 5.95 Percent Due 2035                            
Disclosure of detailed information about borrowings [line items]                            
Interest rate on notes 5.95%   5.95%           5.95% 5.95%        
total unsecured long term debt $ 600.0   $ 600.0           $ 786.0 $ 718.0        
5.39% Series 4 Medium Term Notes, due 2037                            
Disclosure of detailed information about borrowings [line items]                            
Interest rate on notes 5.39%   5.39%           5.39% 5.39%        
total unsecured long term debt                 $ 599.0 $ 599.0        
Notes 6.50 Percent Due 2038                            
Disclosure of detailed information about borrowings [line items]                            
Interest rate on notes 6.50%   6.50%           6.50% 6.50%        
total unsecured long term debt $ 1,150.0   $ 1,150.0           $ 1,565.0 $ 1,439.0        
Notes 6.80 Percent Due 2038                            
Disclosure of detailed information about borrowings [line items]                            
Interest rate on notes 6.80%   6.80%           6.80% 6.80%        
total unsecured long term debt $ 900.0   $ 900.0           $ 1,249.0 $ 1,151.0        
Notes 6.85 Percent Due 2039                            
Disclosure of detailed information about borrowings [line items]                            
Interest rate on notes 6.85%   6.85%           6.85% 6.85%        
total unsecured long term debt $ 750.0   $ 750.0           $ 1,021.0 $ 938.0        
Notes 6.00 Percent Due 2042                            
Disclosure of detailed information about borrowings [line items]                            
Interest rate on notes 6.00%   6.00%           6.00% 6.00%        
total unsecured long term debt                 $ 158.0 $ 140.0        
Notes 4.00 Percent Due 2047                            
Disclosure of detailed information about borrowings [line items]                            
Interest rate on notes 4.00%   4.00%           4.00% 4.00%        
total unsecured long term debt                 $ 1,018.0 $ 936.0        
Additional information                            
Senior notes issued     $ 750.0                      
Debt instrument issue price | $ / shares       $ 99.498                    
Debt instrument effective yield percentage     4.029%             4.029% 4.029%      
4.34% Series 5 Medium Term Notes, due 2046                            
Disclosure of detailed information about borrowings [line items]                            
Interest rate on notes 4.34%   4.34%           4.34% 4.34%        
total unsecured long term debt                 $ 300.0 $ 300.0