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Commitments (Narrative) (Details)
$ in Billions
9 Months Ended
Sep. 30, 2021
USD ($)
Minimum  
Loss Contingencies [Line Items]  
Standby letter of credit, term 1 year
Maximum  
Loss Contingencies [Line Items]  
Standby letter of credit, term 8 years
Standby letters of credit  
Loss Contingencies [Line Items]  
Internal credit ratings (as a percentage of portfolio) - Pass 97.00%
Standby letters of credit - Assets securing certain specifically identified standby letters of credit $ 1.5
Standby letters of credit and participations in standby letters of credit - Liability carrying amount $ 0.1