Commitments and Contingent Liabilities - Summary of Off-Balance Sheet Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Loss Contingencies [Line Items]
ONE YEAR AND LESS	$ 167,034.7	$ 183,566.4
OVER ONE YEAR	17,735.7	18,410.2
TOTAL	184,770.4	201,976.6
Undrawn Commitments
Loss Contingencies [Line Items]
Commitments, participated to others	270.3	366.6
Custody Securities Lent with Indemnification
Loss Contingencies [Line Items]
ONE YEAR AND LESS	143,747.5	170,445.3
OVER ONE YEAR	0.0	0.0
TOTAL	143,747.5	170,445.3
Secured by Cash Deposits or Participated to Others | Standby Letters of Credit
Loss Contingencies [Line Items]
TOTAL	35.4	30.5
Standby Letter of Credit and Financial Guarantee
Loss Contingencies [Line Items]
Guarantor obligations, current carrying value	9,700.0	2,300.0
Undrawn Commitments
Loss Contingencies [Line Items]
ONE YEAR AND LESS	12,205.0	9,567.0
OVER ONE YEAR	17,348.1	17,855.2
TOTAL	29,553.1	27,422.2
Standby Letters of Credit
Loss Contingencies [Line Items]
ONE YEAR AND LESS	11,046.0	3,485.6
OVER ONE YEAR	386.8	553.9
TOTAL	11,432.8	4,039.5
Commercial Letters of Credit
Loss Contingencies [Line Items]
ONE YEAR AND LESS	36.2	68.5
OVER ONE YEAR	0.8	1.1
TOTAL	$ 37.0	$ 69.6