Commitments and Contingent Liabilities - Summary of Off-Balance Sheet Financial Instruments (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Loss Contingencies [Line Items]
ONE YEAR AND LESS	$ 183,566,400,000	$ 170,021,200,000
OVER ONE YEAR	18,410,200,000	18,441,500,000
TOTAL	201,976,600,000	188,462,700,000
Legally Binding Commitments to Extend Credit
Loss Contingencies [Line Items]
Commitments, participated to others	366,600,000	384,700,000
Financial Guarantee
Loss Contingencies [Line Items]
ONE YEAR AND LESS	170,445,300,000	157,478,000,000
OVER ONE YEAR	0	0
TOTAL	170,445,300,000	157,478,000,000
Secured by Cash Deposits or Participated to Others | Standby Letters of Credit
Loss Contingencies [Line Items]
TOTAL	30,500,000	24,200,000
Standby Letter of Credit and Financial Guarantee
Loss Contingencies [Line Items]
Guarantor obligations, current carrying value	2,309,600,000
Guarantees to sponsored member programs		0
Legally Binding Commitments to Extend Credit
Loss Contingencies [Line Items]
ONE YEAR AND LESS	9,567,000,000	11,260,500,000
OVER ONE YEAR	17,855,200,000	17,678,000,000
TOTAL	27,422,200,000	28,938,500,000
Standby Letters of Credit
Loss Contingencies [Line Items]
ONE YEAR AND LESS	3,485,600,000	1,228,100,000
OVER ONE YEAR	553,900,000	763,500,000
TOTAL	4,039,500,000	1,991,600,000
Commercial Letters of Credit
Loss Contingencies [Line Items]
ONE YEAR AND LESS	68,500,000	54,600,000
OVER ONE YEAR	1,100,000	0
TOTAL	$ 69,600,000	$ 54,600,000