Commitments and Contingent Liabilities (Tables)

9 Months Ended

Sep. 30, 2024

Commitments and Contingencies Disclosure [Abstract]

Schedule of Fair Value, Off-balance Sheet Risks

The following table provides details of Northern Trust's off-balance sheet financial instruments as of September 30, 2024 and December 31, 2023.

TABLE 74: SUMMARY OF OFF-BALANCE SHEET FINANCIAL INSTRUMENTS

	SEPTEMBER 30, 2024						DECEMBER 31, 2023
(In Millions)	ONE YEAR AND LESS		OVER ONE YEAR		TOTAL		ONE YEAR AND LESS		OVER ONE YEAR		TOTAL
Undrawn Commitments(1)	$	11,202.5	$	18,982.6	$	30,185.1	$	11,849.5	$	18,909.6	$	30,759.1
Standby Letters of Credit and Financial Guarantees(2)(3)	113,405.2		493.7		113,898.9		85,752.0		639.0		86,391.0
Commercial Letters of Credit	34.8		0.3		35.1		29.2		1.3		30.5
Securities Lent with Indemnification	146,058.1		—		146,058.1		140,539.1		—		140,539.1
Unsettled Reverse Repurchase Agreements	11,544.1		—		11,544.1		27,667.7		—		27,667.7
Total Off-Balance Sheet Financial Instruments	$	282,244.7	$	19,476.6	$	301,721.3	$	265,837.5	$	19,549.9	$	285,387.4

(1) These amounts exclude $203.1 million and $222.2 million of commitments participated to others at September 30, 2024 and December 31, 2023, respectively.

(2) These amounts include $101.8 million and $39.1 million of standby letters of credit secured by cash deposits or participated to others as of September 30, 2024 and December 31, 2023, respectively.

(3) These amounts include a $112.0 billion and $84.6 billion guarantee to the Fixed Income Clearing Corporation (FICC) under the sponsored member program, without taking into consideration the related collateral, as of September 30, 2024 and December 31, 2023, respectively.