Commitments, Contingencies and Guarantees - Schedule of Commitments, Contingencies and Guarantees (Details) $ in Millions	Jun. 30, 2020 USD ($)
Commitments to extend credit
Commitment, Contingencies and Guarantees disclosures
Commitments	$ 38,281
Issued standby and commercial letters of credit
Commitment, Contingencies and Guarantees disclosures
Commitments	4,047
Commitments to enter into forward-starting resale agreements
Commitment, Contingencies and Guarantees disclosures
Commitments	853
Other commitments
Commitment, Contingencies and Guarantees disclosures
Commitments	$ 577