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Commitments (Narrative) (Details) - Standby letters of credit [Member]
$ in Billions
3 Months Ended
Mar. 31, 2019
USD ($)
Loss Contingencies [Line Items]  
Internal credit ratings (as a percentage of portfolio) - Pass 98.00%
Internal credit ratings (as a percentage of portfolio) - Criticized 2.00%
Standby letters of credit - Assets securing certain specifically identified standby letters of credit $ 1.0
Standby letters of credit and participations in standby letters of credit - Liability carrying amount $ 0.2
Minimum [Member]  
Loss Contingencies [Line Items]  
Letter of credit commitment, term 1 year
Maximum [Member]  
Loss Contingencies [Line Items]  
Letter of credit commitment, term 6 years