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Derivative Instruments and Hedging Activities - Narrative (Details) - 6 months ended Jun. 30, 2020
$ in Millions
USD ($)
$ / shares
Schedule of Trading Securities and Other Trading Assets    
Cash flow hedge gain (loss), recorded in AOCI to be reclassed within twelve months | $ $ 3  
Maximum term of time in cash flow hedge 4 years  
Warrants    
Schedule of Trading Securities and Other Trading Assets    
Strike price (in Canadian dollars per share) | $ / shares   $ 6.00