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Allowance for Credit Losses - ECL Estimates (Details)
$ in Millions
9 Months Ended
Sep. 30, 2020
scenario
Jun. 30, 2020
scenario
Jan. 01, 2020
USD ($)
scenario
Measurement of ECL Measurements [Line Items]      
Number of forward-looking economic scenarios | scenario 4 4 3
Reasonable and supportable forecast period for consensus economic scenarios 2 years    
Reversion period for average historical values 20 years    
Reversion period for most assumption variables 3 years    
Management judgment allowance for risk factors associated with large loan exposure in our commercial loan portfolio | $     $ 125
Downside Scenario [Member]      
Measurement of ECL Measurements [Line Items]      
Policy interest rate (percent, less than)     0.50%
Forecast Period 2020 [Member] | Central Scenario [Member]      
Measurement of ECL Measurements [Line Items]      
Inflation (percent)     2.00%
Forecast Period 2020 [Member] | Upside Scenario [Member]      
Measurement of ECL Measurements [Line Items]      
GDP growth rate (percent)     4.00%