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INTEREST REVENUE AND EXPENSE
 12 Months Ended
Dec. 31, 2021
Banking and Thrift, Interest [Abstract]  
INTEREST REVENUE AND EXPENSE INTEREST REVENUE AND EXPENSE
Interest revenue and Interest expense consisted of the following:

In millions of dollars202120202019
Interest revenue   
Loan interest, including fees$35,440 $40,185 $47,751 
Deposits with banks577 928 2,682 
Securities borrowed and purchased under agreements to resell1,052 2,283 6,872 
Investments, including dividends 7,388 7,989 9,860 
Trading account assets(2)
5,365 6,125 7,672 
Other interest-bearing assets653 579 1,673 
Total interest revenue$50,475 $58,089 $76,510 
Interest expense   
Deposits(1)
$2,896 $5,334 $11,852 
Securities loaned and sold under agreements to repurchase1,012 2,077 6,263 
Trading account liabilities(2)
482 628 1,308 
Short-term borrowings and other interest-bearing liabilities121 630 2,465 
Long-term debt3,470 4,669 6,494 
Total interest expense$7,981 $13,338 $28,382 
Net interest income$42,494 $44,751 $48,128 
Provision for credit losses on loans(3,103)15,922 8,218 
Net interest income after provision for credit losses on loans$45,597 $28,829 $39,910 

(1)During 2021, Citi reclassified deposit insurance expenses from Interest expense to Other operating expenses for all periods presented. Amounts reclassified for each year were $1,207 million for 2021, $1,203 million for 2020 and $781 million for 2019. For additional information, see Note 1 to the Consolidated Financial Statements.
(2)Interest expense on Trading account liabilities of ICG is reported as a reduction of Interest revenue. Interest revenue and Interest expense on cash collateral positions are reported in interest on Trading account assets and Trading account liabilities, respectively.