Commitments and Contingent Liabilities - Summary of Off-Balance Sheet Financial Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Loss Contingencies [Line Items]
ONE YEAR AND LESS	$ 194,599.2	$ 162,025.4
OVER ONE YEAR	18,498.6	17,732.6
TOTAL	213,097.8	179,758.0
Undrawn Commitments
Loss Contingencies [Line Items]
Commitments, participated to others	237.1	266.6
Securities Lent with Indemnification
Loss Contingencies [Line Items]
ONE YEAR AND LESS	146,033.2	130,311.0
OVER ONE YEAR	0.0	0.0
TOTAL	146,033.2	130,311.0
Secured by Cash Deposits or Participated to Others | Standby Letters of Credit
Loss Contingencies [Line Items]
TOTAL	32.7	35.1
Standby Letter of Credit and Financial Guarantee
Loss Contingencies [Line Items]
Guarantor obligations, current carrying value	29,400.0	16,300.0
Undrawn Commitments
Loss Contingencies [Line Items]
ONE YEAR AND LESS	13,088.4	13,639.2
OVER ONE YEAR	18,000.8	17,321.4
TOTAL	31,089.2	30,960.6
Standby Letters of Credit
Loss Contingencies [Line Items]
ONE YEAR AND LESS	30,651.0	17,553.0
OVER ONE YEAR	496.6	409.9
TOTAL	31,147.6	17,962.9
Commercial Letters of Credit
Loss Contingencies [Line Items]
ONE YEAR AND LESS	23.2	25.4
OVER ONE YEAR	1.2	1.3
TOTAL	24.4	26.7
Reverse repurchase agreements
Loss Contingencies [Line Items]
ONE YEAR AND LESS	4,803.4	496.8
OVER ONE YEAR	0.0	0.0
TOTAL	$ 4,803.4	$ 496.8