Commitments and Contingent Liabilities (Tables)

12 Months Ended

Dec. 31, 2020

Commitments and Contingencies Disclosure [Abstract]

Schedule of Summary of Off-Balance Sheet Financial Instruments

The following table provides details of Northern Trust's off-balance sheet financial instruments as of December 31, 2020 and 2019.

TABLE 128: SUMMARY OF OFF-BALANCE SHEET FINANCIAL INSTRUMENTS

	DECEMBER 31,
	2020						2019
($ In Millions)	ONE YEAR AND LESS		OVER ONE YEAR		TOTAL		ONE YEAR AND LESS		OVER ONE YEAR		TOTAL
Undrawn Commitments to Extend Credit(1)	$	11,260.5	$	17,678.0	$	28,938.5	$	7,500.2	$	16,906.0	$	24,406.2
Standby Letters of Credit and Financial Guarantees(2)	1,228.1		763.5		1,991.6		1,567.6		845.9		2,413.5
Commercial Letters of Credit	54.6		—		54.6		32.3		—		32.3
Custody Securities Lent with Indemnification	157,478.0		—		157,478.0		138,085.9		—		138,085.9
Total Off-Balance Sheet Financial Instruments	$	170,021.2	$	18,441.5	$	188,462.7	$	147,186.0	$	17,751.9	$	164,937.9

(1) These amounts exclude $384.7 million and $243.6 million of commitments participated to others at December 31, 2020 and 2019, respectively.

(2) These amounts include $24.2 million and $44.5 million of standby letters of credit secured by cash deposits or participated to others as of December 31, 2020 and 2019, respectively.