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ALLOWANCE FOR CREDIT LOSSES (Tables)
 9 Months Ended
Sep. 30, 2021
Loans and Leases Receivable Disclosure [Abstract]  
Schedule of allowance for credit losses and investment in loans by portfolio segment
Three Months Ended September 30,Nine Months Ended September 30,
In millions of dollars2021202020212020
Allowance for credit losses on loans (ACLL) at beginning of period$19,238 $26,298 $24,956 $12,783 
Adjustments to opening balance:(1)
Financial instruments—credit losses (CECL)(1)
— — — 4,201 
Variable post-charge-off third-party collection costs(1)
— — — (443)
Adjusted ACLL at beginning of period$19,238 $26,298 $24,956 $16,541 
Gross credit losses on loans$(1,389)$(2,367)$(5,441)$(7,374)
Gross recoveries on loans428 448 1,412 1,235 
Net credit losses on loans (NCLs) $(961)$(1,919)$(4,029)$(6,139)
Replenishment of NCLs$961 $1,919 $4,029 $6,139 
Net reserve builds (releases) for loans(1,010)164 (6,262)9,453 
Net specific reserve builds (releases) for loans(139)(152)(560)706 
Total provision for credit losses on loans (PCLL)$(188)$1,931 $(2,793)$16,298 
Initial allowance for credit losses on newly purchased credit-deteriorated assets during the period— — — 4 
Other, net (see table below)(374)116 (419)(278)
ACLL at end of period$17,715 $26,426 $17,715 $26,426 
Allowance for credit losses on unfunded lending commitments (ACLUC) at beginning of period(2)
$2,073 $1,859 $2,655 $1,456 
Adjustment to opening balance for CECL adoption(1)
— — — (194)
Provision (release) for credit losses on unfunded lending commitments(13)424 (595)1,094 
Other, net
3 16 3 (57)
ACLUC at end of period(2)
$2,063 $2,299 $2,063 $2,299 
Total allowance for credit losses on loans, leases and unfunded lending commitments$19,778 $28,725 $19,778 $28,725 

Other, net detailsThree Months Ended September 30,Nine Months Ended September 30,
In millions of dollars2021202020212020
Sales or transfers of various consumer loan portfolios to HFS$(278)$— $(278)$(4)
FX translation(93)116 (139)(279)
Other(3)— (2)5 
Other, net$(374)$116 $(419)$(278)

(1)See Note 1 to the Consolidated Financial Statements in Citi’s 2020 Annual Report on Form 10-K for further discussion of the impact of Citi’s adoption of CECL and the change in accounting principle for collection costs.
(2)Represents additional credit loss reserves for unfunded lending commitments and letters of credit recorded in Other liabilities on the Consolidated Balance Sheet.
Allowance for Credit Losses on Loans and End-of-Period Loans

Three Months Ended
September 30, 2021September 30, 2020
In millions of dollarsCorporateConsumerTotalCorporateConsumerTotal
ACLL at beginning of period$3,127 $16,111 $19,238 $6,824 $19,474 $26,298 
Charge-offs(49)(1,340)(1,389)(351)(2,016)(2,367)
Recoveries10 418 428 26 422 448 
Replenishment of NCLs39 922 961 325 1,594 1,919 
Net reserve builds (releases)(44)(966)(1,010)267 (103)164 
Net specific reserve builds (releases)(21)(118)(139)(161)9 (152)
Initial allowance for credit losses on newly purchased credit-deteriorated assets during the period— — — — — — 
Other(15)(359)(374)8 108 116 
Ending balance$3,047 $14,668 $17,715 $6,938 $19,488 $26,426 
Nine Months Ended
September 30, 2021September 30, 2020
In millions of dollarsCorporateConsumerTotalCorporateConsumerTotal
ACLL at beginning of period$5,402 $19,554 $24,956 $2,886 $9,897 $12,783 
Adjustments to opening balance:
Financial instruments—credit losses (CECL adoption)(1)
— — — (721)4,922 4,201 
Variable post-charge-off third-party collection costs(1)
— — — — (443)(443)
Charge-offs(403)(5,038)(5,441)(837)(6,537)(7,374)
Recoveries89 1,323 1,412 61 1,174 1,235 
Replenishment of NCLs314 3,715 4,029 776 5,363 6,139 
Net reserve builds (releases)(2,137)(4,125)(6,262)4,418 5,035 9,453 
Net specific reserve builds (releases)(189)(371)(560)373 333 706 
Initial allowance for credit losses on newly purchased credit-deteriorated assets during the period— — — — 4 4 
Other(29)(390)(419)(18)(260)(278)
Ending balance$3,047 $14,668 $17,715 $6,938 $19,488 $26,426 

(1)See “Accounting Changes” in Note 1 to the Consolidated Financial Statements for additional details.
September 30, 2021December 31, 2020
In millions of dollarsCorporateConsumerTotalCorporateConsumerTotal
ACLL   
Collectively evaluated$2,732 $13,777 $16,509 $4,887 $18,207 $23,094 
Individually evaluated 315 891 1,206 515 1,345 1,860 
Purchased credit deteriorated— — — — 2 2 
Total ACLL$3,047 $14,668 $17,715 $5,402 $19,554 $24,956 
Loans, net of unearned income
Collectively evaluated$390,968 $260,258 $651,226 $376,677 $283,885 $660,562 
Individually evaluated 2,400 3,852 6,252 3,527 4,799 8,326 
Purchased credit deteriorated— 127 127 — 141 141 
Held at fair value7,146 13 7,159 6,840 14 6,854 
Total loans, net of unearned income$400,514 $264,250 $664,764 $387,044 $288,839 $675,883 
Schedule of allowance for credit losses on held-to-maturity securities
Allowance for Credit Losses on HTM Debt Securities
Three Months Ended September 30, 2021
In millions of dollarsMortgage-backedState and municipalForeign governmentAsset-backedTotal HTM
Allowance for credit losses on HTM debt securities at beginning
of quarter		$5 $72 $5 $1 $83 
Gross credit losses— — — — — 
Gross recoveries— — — — — 
Net credit losses (NCLs)$— $— $— $— $— 
Replenishment of NCLs$— $— $— $— $— 
Net reserve builds (releases)— (5)(1)— (6)
Net specific reserve builds (releases)(4)— — — (4)
Total provision for credit losses on HTM debt securities$(4)$(5)$(1)$— $(10)
Other, net$— $— $— $— $— 
Initial allowance for credit losses on newly purchased credit-deteriorated securities during the period— — — — — 
Allowance for credit losses on HTM debt securities at end of quarter$1 $67 $4 $1 $73 
Nine Months Ended September 30, 2021
In millions of dollarsMortgage-backedState and municipalForeign governmentAsset-backedTotal 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)$— $— $— $(3)
Net reserve builds (releases)2 (7)(2)(3)(10)
Net specific reserve builds (releases)(4)— — — (4)
Total provision for credit losses on HTM debt securities$(5)$(7)$(2)$(3)$(17)
Other, net$— $— $— $1 $1 
Initial allowance for credit losses on newly purchased credit-deteriorated securities during the period— — — — — 
Allowance for credit losses on HTM debt securities at end of quarter$1 $67 $4 $1 $73 
Allowance for Credit Losses on HTM Debt Securities
Three Months Ended September 30, 2020
In millions of dollarsMortgage-backedState and municipalForeign governmentAsset-
backed		Total HTM
Allowance for credit losses on HTM debt securities at beginning of quarter$— $99 $6 $2 $107 
Adjustment to opening balance for CECL adoption— — — — — 
Gross credit losses— — — — — 
Gross recoveries— — — — — 
Net credit losses (NCLs)$— $— $— $— $— 
Replenishment of NCLs$— $— $— $— $— 
Net reserve builds (releases)3 (19)(1)1 (16)
Net specific reserve builds (releases)— — — — — 
Total provision for credit losses on HTM debt securities$3 $(19)$(1)$1 $(16)
Other, net$5 $— $2 $— $7 
Initial allowance for credit losses on newly purchased credit-deteriorated securities during the period— — — — — 
Allowance for credit losses on HTM debt securities at end of quarter$8 $80 $7 $3 $98 
Nine Months Ended September 30, 2020
In millions of dollarsMortgage-backedState and municipalForeign governmentAsset-
backed		Total HTM
Allowance for credit losses on HTM debt securities at beginning of year$— $— $— $— $— 
Adjustment to opening balance for CECL adoption— 61 4 5 70 
Gross credit losses— — — — — 
Gross recoveries— — — — — 
Net credit losses (NCLs)$— $— $— $— $— 
Replenishment of NCLs$— $— $— $— $— 
Net reserve builds3 16 1 1 21 
Net specific reserve builds (releases)— — — — — 
Total provision for credit losses on HTM debt securities$3 $16 $1 $1 $21 
Other, net$5 $3 $2 $(3)$7 
Initial allowance for credit losses on newly purchased credit-deteriorated securities during the period— — — — — 
Allowance for credit losses on HTM debt securities at end of quarter$8 $80 $7 $3 $98 
Schedule of allowance for credit losses on other assets
Allowance for Credit Losses on Other Assets
Three Months Ended September 30, 2021
In millions of dollarsCash and due from banksDeposits with banksSecurities borrowed and purchased under agreements
to resell		Brokerage receivables
All other assets(1)
Total
Allowance for credit losses on other assets at beginning of quarter$— $24 $8 $— $28 $60 
Gross credit losses— — — — — — 
Gross recoveries— — — — — 
Net credit losses (NCLs)$— $— $— $— $— $— 
Replenishment of NCLs$— $— $— $— $— $— 
Net reserve builds (releases)— — 1 — (4)(3)
Total provision for credit losses$— $— $1 $— $(4)$(3)
Other, net$— $— $— $— $1 $1 
Allowance for credit losses on other assets at end of quarter$— $24 $9 $— $25 $58 
Nine Months Ended September 30, 2021
In millions of dollarsCash and due from banksDeposits with banksSecurities borrowed and purchased under agreements
to resell		Brokerage receivables
All other assets(1)
Total
Allowance for credit losses on other assets at beginning of year$— $20 $10 $— $25 $55 
Gross credit losses— — — — — — 
Gross recoveries— — — — — — 
Net credit losses (NCLs)$— $— $— $— $— $— 
Replenishment of NCLs$— $— $— $— $— $— 
Net reserve builds (releases)— 5 (1)— (1)3 
Total provision for credit losses$— $5 $(1)$— $(1)$3 
Other, net$— $(1)$— $— $1 $— 
Allowance for credit losses on other assets at end of quarter$— $24 $9 $— $25 $58 

(1)Primarily accounts receivable.
Allowance for Credit Losses on Other Assets
Three Months Ended September 30, 2020
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 at beginning of quarter$— $18 $7 $— $77 $102 
Adjustment to opening balance for CECL adoption— — — — — — 
Gross credit losses— — — — — — 
Gross recoveries— — — — — — 
Net credit losses (NCLs)$— $— $— $— $— $— 
Replenishment of NCLs$— $— $— $— $— $— 
Net reserve builds (releases)— 7 (3)— (17)(13)
Total provision for credit losses$— $7 $(3)$— $(17)$(13)
Other, net$— $— $— $— $(10)$(10)
Allowance for credit losses on other assets at end of quarter$— $25 $4 $— $50 $79 
 
Nine Months Ended September 30, 2020
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 at beginning of year$— $— $— $— $— $— 
Adjustment to opening balance for CECL adoption6 14 2 1 3 26 
Gross credit losses— — — — — — 
Gross recoveries— — — — — — 
Net credit losses (NCLs)$— $— $— $— $— $— 
Replenishment of NCLs$— $— $— $— $— $— 
Net reserve builds (releases)(6)11 2 (1)25 31 
Total provision for credit losses$(6)$11 $2 $(1)$25 $31 
Other, net$— $— $— $— $22 $22 
Allowance for credit losses on other assets at end of year$— $25 $4 $— $50 $79 

(1)    Primarily accounts receivable.