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ALLOWANCE FOR CREDIT LOSSES (Tables)
 3 Months Ended
Mar. 31, 2021
Loans and Leases Receivable Disclosure [Abstract]  
Schedule of allowance for credit losses and investment in loans by portfolio segment
Three Months Ended March 31,
In millions of dollars20212020
Allowance for credit losses on loans (ACLL) at beginning of period$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$24,956 $16,541 
Gross credit losses on loans$(2,208)$(2,479)
Gross recoveries on loans460 420 
Net credit losses on loans (NCLs) $(1,748)$(2,059)
Replenishment of NCLs$1,748 $2,059 
Net reserve builds (releases) for loans(3,068)4,094 
Net specific reserve builds (releases) for loans(159)224 
Total provision for credit losses on loans (PCLL)$(1,479)$6,377 
Initial allowance for credit losses on newly purchased credit deteriorated assets during the period— 4 
Other, net (see table below)(91)(483)
ACLL at end of period$21,638 $20,380 
Allowance for credit losses on unfunded lending commitments (ACLUC) at beginning of period(2)
$2,655 $1,456 
Adjustment to opening balance for CECL adoption(1)
— (194)
Provision (release) for credit losses on unfunded lending commitments(626)557 
Other, net
(17)(6)
ACLUC at end of period(2)
$2,012 $1,813 
Total allowance for credit losses on loans, leases and unfunded lending commitments$23,650 $22,193 
Other, net detailsThree Months Ended March 31,
In millions of dollars20212020
Sales or transfers of various consumer loan portfolios to HFS$— $(3)
FX translation(108)(483)
Other17 3 
Other, net$(91)$(483)

(1)See Note 1 to the Consolidated Financial Statements 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
March 31, 2021March 31, 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(1)
   Financial instruments—credit losses (CECL)— — — (721)4,922 4,201 
   Variable post-charge-off third-party collection costs— — — — (443)(443)
Adjusted ACLL at beginning of period$5,402 $19,554 $24,956 $2,165 $14,376 $16,541 
Charge-offs(203)(2,005)(2,208)(139)(2,340)(2,479)
Recoveries17 443 460 12 408 420 
Replenishment of net charge-offs186 1,562 1,748 127 1,932 2,059 
Net reserve builds (releases)(1,273)(1,795)(3,068)1,268 2,826 4,094 
Net specific reserve builds (releases)(38)(121)(159)48 176 224 
Initial allowance for credit losses on newly purchased credit-deteriorated assets during the period— — — — 4 4 
Other(7)(84)(91)(30)(453)(483)
Ending balance$4,084 $17,554 $21,638 $3,451 $16,929 $20,380 

(1)See “Accounting Changes” in Note 1 to the Consolidated Financial Statements for additional details.
March 31, 2021December 31, 2020
In millions of dollarsCorporateConsumerTotalCorporateConsumerTotal
Allowance for credit losses on loans   
Collectively evaluated$3,595 $16,339 $19,934 $4,887 $18,207 $23,094 
Individually evaluated 489 1,214 1,703 515 1,345 1,860 
Purchased credit deteriorated— 1 1 — 2 2 
Total allowance for credit losses on loans$4,084 $17,554 $21,638 $5,402 $19,554 $24,956 
Loans, net of unearned income
Collectively evaluated$381,338 $269,151 $650,489 $376,677 $283,885 $660,562 
Individually evaluated 3,106 4,733 7,839 3,527 4,799 8,326 
Purchased credit deteriorated— 135 135 — 141 141 
Held at fair value7,510 15 7,525 6,840 14 6,854 
Total loans, net of unearned income$391,954 $274,034 $665,988 $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 March 31, 2021
In millions of dollarsMortgage-backedState and municipalForeign governmentAsset-backedTotal HTM
Allowance for credit losses on HTM debt securities at beginning
of period		$3 $74 $6 $3 $86 
Gross credit losses— — — — — 
Gross recoveries3 — — — 3 
Net credit losses (NCLs)$3 $— $— $— $3 
NCLs$(3)$— $— $— $(3)
Net reserve builds (releases)1 (5)(1)(3)(8)
Net specific reserve builds (releases)— — — — — 
Total provision for credit losses on HTM debt securities$(2)$(5)$(1)$(3)$(11)
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 period$4 $69 $5 $— $78 
Three Months Ended March 31, 2020
In millions of dollarsMortgage-backedState and municipalForeign governmentAsset-
backed		Total HTM
Allowance for credit losses on HTM debt securities at beginning
of period		$— $— $— $— $— 
Adjustment to opening balance for CECL adoption— 61 4 5 70 
Net credit losses (NCLs)$— $— $— $— $— 
NCLs$— $— $— $— $— 
Net reserve builds (releases)— 5 — 1 6 
Net specific reserve builds (releases)— — — — — 
Total provision for credit losses on HTM debt securities$— $5 $— $1 $6 
Other, net$— $— $— $— $— 
Initial allowance for credit losses on newly purchased credit-deteriorated securities during the period— — — — — 
Allowance for credit losses on HTM debt securities at end of period$— $66 $4 $6 $76 
Schedule of allowance for credit losses on other assets
Allowance for Credit Losses on Other Assets
Three Months Ended March 31, 2021
In millions of dollarsCash and due from banksDeposits with banksSecurities borrowed and purchased under agreements
to resell		Brokerage receivables
All other assets(1)
Total
Allowance for credit losses at beginning of period$— $20 $10 $— $25 $55 
Net credit losses (NCLs)$— $— $— $— $— $— 
NCLs$— $— $— $— $— $— 
Net reserve builds (releases)— 9 (5)— 5 9 
Total provision for credit losses$— $9 $(5)$— $5 $9 
Other, net$— $(1)$— $— $— $(1)
Allowance for credit losses on other assets at end of period$— $28 $5 $— $30 $63 
Three Months Ended March 31, 2020
In millions of dollarsCash and due from banksDeposits with banksSecurities borrowed and purchased under agreements
to resell		Brokerage receivables
All other assets(1)
Total
Allowance for credit losses at beginning of period$— $— $— $— $— $— 
Adjustment to opening balance for CECL adoption6 14 2 1 3 26 
Net credit losses (NCLs)$— $— $— $— $— $— 
NCLs$— $— $— $— $— $— 
Net reserve builds (releases)(6)(6)3 (1)6 (4)
Total provision for credit losses$(6)$(6)$3 $(1)$6 $(4)
Other, net$— $— $— $— $32 $32 
Allowance for credit losses on other assets at end of period$— $8 $5 $— $41 $54 

(1)Primarily accounts receivable.