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other operating income (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CAD ($)
other operating income          
Government assistance, including deferral account amortization     $ 23   $ 32
Investment income, gain (loss) on disposal of assets and other     230   45
Change in business combination-related accrued receivable and provisions     17   26
Interest income     3    
Total     $ 273   $ 103
Subsidy receipts   $ 18   $ 19  
Contribution expense rate   0.54% 0.54%    
Interim contribution expense rate 0.60%        
Quebec employment positions tax credit   $ 4   $ 7