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Commitments, Contingencies and Guarantees - Schedule of Commitments, Contingencies and Guarantees (Details)
$ in Millions
Jun. 30, 2019
USD ($)
Commitments to extend credit  
Commitment, Contingencies and Guarantees disclosures  
Commitments $ 36,452
Issued standby and commercial letters of credit  
Commitment, Contingencies and Guarantees disclosures  
Commitments 4,554
Commitments to enter into forward-starting resale agreements  
Commitment, Contingencies and Guarantees disclosures  
Commitments 1,589
Other commitments  
Commitment, Contingencies and Guarantees disclosures  
Commitments $ 516