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ALLOWANCE FOR CREDIT LOSSES (Tables)
 12 Months Ended
Dec. 31, 2021
Loans and Leases Receivable Disclosure [Abstract]  
Schedule of allowance for credit losses and investment in loans by portfolio segment
In millions of dollars202120202019
Allowance for credit losses on loans (ACLL) at beginning of year$24,956 $12,783 $12,315 
Adjustments to opening balance(1):
Financial instruments—credit losses (CECL) adoption— 4,201 — 
Variable post-charge-off third-party collection costs— (443)— 
Adjusted ACLL at beginning of year$24,956 $16,541 $12,315 
Gross credit losses on loans$(6,720)$(9,263)$(9,341)
Gross recoveries on loans1,825 1,652 1,573 
Net credit losses on loans (NCLs)$(4,895)$(7,611)$(7,768)
Replenishment of NCLs$4,895 $7,611 $7,768 
Net reserve builds (releases) for loans(7,283)7,635 364 
Net specific reserve builds (releases) for loans(715)676 86 
Total provision for credit losses on loans (PCLL)$(3,103)$15,922 $8,218 
Initial allowance for credit losses on newly purchased credit-deteriorated assets during the period— 4 — 
Other, net (see table below)(503)100 18 
ACLL at end of year$16,455 $24,956 $12,783 
Allowance for credit losses on unfunded lending commitments (ACLUC) at beginning of year(1)
$2,655 $1,456 $1,367 
Adjustment to opening balance for CECL adoption(1)
— (194)— 
Provision (release) for credit losses on unfunded lending commitments(788)1,446 92 
Other, net(2)
4 (53)(3)
ACLUC at end of year(1)
$1,871 $2,655 $1,456 
Total allowance for credit losses on loans, leases and unfunded lending commitments$18,326 $27,611 $14,239 

Other, net details
In millions of dollars202120202019
Sales or transfers of various consumer loan portfolios to HFS
Reclass of Australia consumer ACLL to HFS$(280)$— $— 
Reclass of the Philippines consumer ACLL to HFS(90)— — 
Transfer of real estate loan portfolios— (4)(42)
Reclasses of consumer ACLL to HFS(3)
$(370)$(4)$(42)
FX translation and other(133)104 60 
Other, net$(503)$100 $18 

(1)Represents additional credit loss reserves for unfunded lending commitments and letters of credit recorded in Other liabilities on the Consolidated Balance Sheet.
(2)2020 includes a non-provision transfer of $68 million, representing reserves on performance guarantees. The reserves on these contracts have been reclassified out of the allowance for credit losses on unfunded lending commitments and into Other liabilities on the Consolidated Balance Sheet beginning in 2020.
(3)See Note 2.
Allowance for Credit Losses on Loans and End-of-Period Loans at December 31, 2021

In millions of dollarsCorporateConsumerTotal
ACLL at beginning of year$4,776 $20,180 $24,956 
Gross credit losses on loans(500)$(6,220)$(6,720)
Gross recoveries on loans114 1,711 1,825 
Replenishment of NCLs386 4,509 4,895 
Net reserve builds (releases)(2,075)(5,208)(7,283)
Net specific reserve builds (releases)(255)(460)(715)
Initial allowance for credit losses on newly purchased credit-deteriorated assets
during the year		— — — 
Other(31)(472)(503)
Ending balance$2,415 $14,040 $16,455 
ACLL   
Collectively evaluated$2,203 $13,227 $15,430 
Individually evaluated212 813 1,025 
Purchased credit deteriorated— — — 
Total ACLL$2,415 $14,040 $16,455 
Loans, net of unearned income
Collectively evaluated$283,610 $372,655 $656,265 
Individually evaluated1,553 3,748 5,301 
Purchased credit deteriorated— 119 119 
Held at fair value6,070 12 6,082 
Total loans, net of unearned income$291,233 $376,534 $667,767 
Allowance for Credit Losses on Loans and End-of-Period Loans at December 31, 2020

In millions of dollarsCorporateConsumerTotal
ACLL at beginning of year$2,727 $10,056 $12,783 
Adjustments to opening balance:
Financial instruments—credit losses (CECL)(1)
(816)5,017 4,201 
Variable post-charge-off third-party collection costs(1)
— (443)(443)
Adjusted ACLL at beginning of year$1,911 $14,630 $16,541 
Gross credit losses on loans$(976)$(8,287)$(9,263)
Gross recoveries on loans76 1,576 1,652 
Replenishment of NCLs900 6,711 7,611 
Net reserve builds (releases)2,551 5,084 7,635 
Net specific reserve builds (releases)249 427 676 
Initial allowance for credit losses on newly purchased credit-deteriorated assets
during the year		— 4 4 
Other65 35 100 
Ending balance$4,776 $20,180 $24,956 
ACLL   
Collectively evaluated$4,298 $18,797 $23,095 
Individually evaluated478 1,381 1,859 
Purchased credit deteriorated— 2 2 
Total ACLL$4,776 $20,180 $24,956 
Loans, net of unearned income
Collectively evaluated$279,523 $381,451 $660,974 
Individually evaluated3,046 4,868 7,914 
Purchased credit deteriorated— 141 141 
Held at fair value6,840 14 6,854 
Total loans, net of unearned income$289,409 $386,474 $675,883 

(1)See “Accounting Changes” in Note 1 for additional details.

Allowance for Credit Losses on Loans at December 31, 2019

In millions of dollarsCorporateConsumerTotal
ACLL at beginning of year$2,645 $9,670 $12,315 
Gross credit losses on loans(435)(8,906)(9,341)
Gross recoveries on loans81 1,492 1,573 
Replenishment of NCLs354 7,414 7,768 
Net reserve builds (releases)82 282 364 
Net specific reserve builds (releases)(6)92 86 
Other6 12 18 
Ending balance$2,727 $10,056 $12,783 
Schedule of allowance for credit losses on held-to-maturity securities
Allowance for Credit Losses on HTM Debt Securities

Year ended December 31, 2021
In millions of dollarsMortgage-backedState and municipalForeign governmentAsset-backedAll other debt securitiesTotal HTM
Allowance for credit losses on HTM debt securities at beginning of year$3 $74 $6 $3 $— $86 
Gross credit losses— — — — — — 
Gross recoveries3 — — — — 3 
Net credit losses (NCLs)$3 $— $— $— $— $3 
Replenishment of NCLs$(3)$— $— $— $— $(3)
Net reserve builds (releases)7 1 (2)(2)— 4 
Net specific reserve builds (releases)(4)— — — — (4)
Total provision for credit losses on HTM debt securities$— $1 $(2)$(2)$— $(3)
Other, net$— $— $— $1 $— $1 
Initial allowance for credit losses on newly purchased credit-deteriorated securities during the year— — — — — — 
Allowance for credit losses on HTM debt securities at end of year$6 $75 $4 $2 $— $87 

Allowance for Credit Losses on HTM Debt Securities

Year ended December 31, 2020
In millions of dollarsMortgage-backedState and municipalForeign governmentAsset-
backed		All other debt securitiesTotal HTM
Allowance for credit losses on HTM debt securities at beginning of year$— $— $— $— $— $— 
Adjustment to opening balance for CECL adoption— 61 4 5 70 
Gross credit losses— — — — — — 
Gross recoveries— — — — — — 
Net credit losses (NCLs)$— $— $— $— $— $— 
Replenishment of NCLs$— $— $— $— $— $— 
Net reserve builds (releases)(2)10 (2)1 — 7 
Net specific reserve builds (releases)— — — — — — 
Total provision for credit losses on HTM debt securities$(2)$10 $(2)$1 $— $7 
Other, net$5 $3 $4 $(3)$— $9 
Initial allowance for credit losses on newly purchased credit-deteriorated securities during the year— — — — — — 
Allowance for credit losses on HTM debt securities at
end of year		$3 $74 $6 $3 $— $86 
Schedule of allowance for credit losses on other assets
Allowance for Credit Losses on Other Assets

Year ended December 31, 2021
In millions of dollarsCash and due from banksDeposits with banksSecurities borrowed and purchased under agreements
to resell		Brokerage receivables
All other assets(1)
Total
Allowance for credit losses on other assets at beginning of year$— $20 $10 $— $25 $55 
Gross credit losses— — — — (2)(2)
Gross recoveries— — — — — — 
Net credit losses (NCLs)$— $— $— $— $(2)$(2)
Replenishment of NCLs$— $— $— $— $2 $2 
Net reserve builds (releases)— 2 (4)— — (2)
Total provision for credit losses$— $2 $(4)$— $2 $— 
Other, net$— $(1)$— $— $1 $— 
Allowance for credit losses on other assets at
end of year		$— $21 $6 $— $26 $53 

(1)Primarily accounts receivable.

Allowance for Credit Losses on Other Assets

Year ended December 31, 2020
In millions of dollarsCash and
due from banks		Deposits with banksSecurities borrowed and purchased under agreements
to resell		Brokerage receivables
All other assets(1)
Total
Allowance for credit losses on other assets at beginning of year$— $— $— $— $— $— 
Adjustment to opening balance for CECL adoption6 14 2 1 3 26 
Gross credit losses— — — — — — 
Gross recoveries— — — — — — 
Net credit losses (NCLs)$— $— $— $— $— $— 
Replenishment of NCLs$— $— $— $— $— $— 
Net reserve builds (releases)(6)5 8 (1)1 7 
Total provision for credit losses$(6)$5 $8 $(1)$1 $7 
Other, net$— $1 $— $— $21 $22 
Allowance for credit losses on other assets at end of year$— $20 $10 $— $25 $55 

(1)Primarily accounts receivable.