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ALLOWANCE FOR CREDIT LOSSES (Tables)
 6 Months Ended
Jun. 30, 2021
Loans and Leases Receivable Disclosure [Abstract]  
Schedule of allowance for credit losses and investment in loans by portfolio segment
Three Months Ended June 30,Six Months Ended June 30,
In millions of dollars2021202020212020
Allowance for credit losses on loans (ACLL) at beginning of period$21,638 $20,380 $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$21,638 $20,380 $24,956 $16,541 
Gross credit losses on loans$(1,844)$(2,528)$(4,052)$(5,007)
Gross recoveries on loans524 367 984 787 
Net credit losses on loans (NCLs) $(1,320)$(2,161)$(3,068)$(4,220)
Replenishment of NCLs$1,320 $2,161 $3,068 $4,220 
Net reserve builds (releases) for loans(2,184)5,195 (5,252)9,289 
Net specific reserve builds (releases) for loans(262)634 (421)858 
Total provision for credit losses on loans (PCLL)$(1,126)$7,990 $(2,605)$14,367 
Initial allowance for credit losses on newly purchased credit-deteriorated assets during the period— — — 4 
Other, net (see table below)46 89 (45)(394)
ACLL at end of period$19,238 $26,298 $19,238 $26,298 
Allowance for credit losses on unfunded lending commitments (ACLUC) at beginning of period(2)
$2,012 $1,813 $2,655 $1,456 
Adjustment to opening balance for CECL adoption(1)
— — — (194)
Provision (release) for credit losses on unfunded lending commitments44 113 (582)670 
Other, net
17 (67)— (73)
ACLUC at end of period(2)
$2,073 $1,859 $2,073 $1,859 
Total allowance for credit losses on loans, leases and unfunded lending commitments$21,311 $28,157 $21,311 $28,157 
Other, net detailsThree Months Ended June 30,Six Months Ended June 30,
In millions of dollars2021202020212020
Sales or transfers of various consumer loan portfolios to HFS$— $(1)$— $(4)
FX translation62 88 (46)(395)
Other(16)2 1 5 
Other, net$46 $89 $(45)$(394)

(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
June 30, 2021June 30, 2020
In millions of dollarsCorporateConsumerTotalCorporateConsumerTotal
ACLL at beginning of period$4,084 $17,554 $21,638 $3,451 $16,929 $20,380 
Charge-offs(151)(1,693)(1,844)(347)(2,181)(2,528)
Recoveries62 462 524 23 344 367 
Replenishment of NCLs89 1,231 1,320 324 1,837 2,161 
Net reserve builds (releases)(820)(1,364)(2,184)2,883 2,312 5,195 
Net specific reserve builds (releases)(130)(132)(262)486 148 634 
Initial allowance for credit losses on newly purchased credit-deteriorated assets during the period— — — — — — 
Other(7)53 46 4 85 89 
Ending balance$3,127 $16,111 $19,238 $6,824 $19,474 $26,298 
Six Months Ended
June 30, 2021June 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)— — — (721)4,922 4,201 
Variable post-charge-off third-party collection costs— — — — (443)(443)
Charge-offs(354)(3,698)(4,052)(485)(4,522)(5,007)
Recoveries79 905 984 34 753 787 
Replenishment of NCLs275 2,793 3,068 451 3,769 4,220 
Net reserve builds (releases)(2,093)(3,159)(5,252)4,151 5,138 9,289 
Net specific reserve builds (releases)(168)(253)(421)534 324 858 
Initial allowance for credit losses on newly purchased credit-deteriorated assets during the period— — — — 4 4 
Other(14)(31)(45)(26)(368)(394)
Ending balance$3,127 $16,111 $19,238 $6,824 $19,474 $26,298 

(1)See “Accounting Changes” in Note 1 to the Consolidated Financial Statements for additional details.
June 30, 2021December 31, 2020
In millions of dollarsCorporateConsumerTotalCorporateConsumerTotal
ACLL   
Collectively evaluated$2,782 $15,028 $17,810 $4,887 $18,207 $23,094 
Individually evaluated 345 1,084 1,429 515 1,345 1,860 
Purchased credit deteriorated(1)
— (1)(1)— 2 2 
Total ACLL$3,127 $16,111 $19,238 $5,402 $19,554 $24,956 
Loans, net of unearned income
Collectively evaluated$390,670 $271,278 $661,948 $376,677 $283,885 $660,562 
Individually evaluated 2,576 4,469 7,045 3,527 4,799 8,326 
Purchased credit deteriorated— 134 134 — 141 141 
Held at fair value7,693 14 7,707 6,840 14 6,854 
Total loans, net of unearned income$400,939 $275,895 $676,834 $387,044 $288,839 $675,883 

(1)    The negative allowance on purchased credit-deteriorated loans resulted from expected recoveries on previously written-off accounts.
Schedule of allowance for credit losses on held-to-maturity securities
Allowance for Credit Losses on HTM Debt Securities
Three Months Ended June 30, 2021
In millions of dollarsMortgage-backedState and municipalForeign governmentAsset-backedTotal HTM
Allowance for credit losses on HTM debt securities at beginning
of quarter		$4 $69 $5 $— $78 
Gross credit losses— — — — — 
Gross recoveries— — — — — 
Net credit losses (NCLs)$— $— $— $— $— 
Replenishment of NCLs$— $— $— $— $— 
Net reserve builds (releases)1 3 — — 4 
Net specific reserve builds (releases)— — — — — 
Total provision for credit losses on HTM debt securities$1 $3 $— $— $4 
Other, net$— $— $— $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$5 $72 $5 $1 $83 
Six Months Ended June 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)$— $— $— $(3)
Net reserve builds (releases)2 (2)(1)(3)(4)
Net specific reserve builds (releases)— — — — — 
Total provision for credit losses on HTM debt securities$(1)$(2)$(1)$(3)$(7)
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$5 $72 $5 $1 $83 
Allowance for Credit Losses on HTM Debt Securities
Three Months Ended June 30, 2020
In millions of dollarsState and municipalForeign governmentAsset-
backed		Total HTM
Allowance for credit losses on HTM debt securities at beginning of quarter$66 $4 $6 $76 
Adjustment to opening balance for CECL adoption— — — — 
Gross credit losses— — — — 
Gross recoveries— — — — 
Net credit losses (NCLs)$— $— $— $— 
Replenishment of NCLs$— $— $— $— 
Net reserve builds (releases)30 2 (1)31 
Net specific reserve builds (releases)— — — — 
Total provision for credit losses on HTM debt securities$30 $2 $(1)$31 
Other, net$3 $— $(3)$— 
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$99 $6 $2 $107 
Six Months Ended June 30, 2020
In millions of dollarsState and municipalForeign governmentAsset-
backed		Total HTM
Allowance for credit losses on HTM debt securities at beginning of year$— $— $— $— 
Adjustment to opening balance for CECL adoption61 4 5 70 
Gross credit losses— — — — 
Gross recoveries— — — — 
Net credit losses (NCLs)$— $— $— $— 
Replenishment of NCLs$— $— $— $— 
Net reserve builds35 2 — 37 
Net specific reserve builds (releases)— — — — 
Total provision for credit losses on HTM debt securities$35 $2 $— $37 
Other, net$3 $— $(3)$— 
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$99 $6 $2 $107 
Schedule of allowance for credit losses on other assets
Allowance for Credit Losses on Other Assets
Three Months Ended June 30, 2021
In millions of dollarsCash and due from banksDeposits with banksSecurities borrowed and purchased under agreements
to resell		Brokerage receivables
All other assets(1)
Total
Allowance for credit losses on other assets at beginning of quarter$— $28 $5 $— $30 $63 
Gross credit losses— — — — — — 
Gross recoveries— — — — — 
Net credit losses (NCLs)$— $— $— $— $— $— 
Replenishment of NCLs$— $— $— $— $— $— 
Net reserve builds (releases)— (4)3 — (2)(3)
Total provision for credit losses$— $(4)$3 $— $(2)$(3)
Other, net$— $— $— $— $— $— 
Allowance for credit losses on other assets at end of quarter$— $24 $8 $— $28 $60 
Six Months Ended June 30, 2021
In millions of dollarsCash and due from banksDeposits with banksSecurities borrowed and purchased under agreements
to resell		Brokerage receivables
All other assets(1)
Total
Allowance for credit losses on other assets at beginning of year$— $20 $10 $— $25 $55 
Gross credit losses— — — — — — 
Gross recoveries— — — — — — 
Net credit losses (NCLs)$— $— $— $— $— $— 
Replenishment of NCLs$— $— $— $— $— $— 
Net reserve builds (releases)— 5 (2)— 3 6 
Total provision for credit losses$— $5 $(2)$— $3 $6 
Other, net$— $(1)$— $— $— $(1)
Allowance for credit losses on other assets at end of quarter$— $24 $8 $— $28 $60 

(1)Primarily accounts receivable.
Allowance for Credit Losses on Other Assets
Three Months Ended June 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$— $8 $5 $— $41 $54 
Adjustment to opening balance for CECL adoption— — — — — — 
Gross credit losses— — — — — — 
Gross recoveries— — — — — — 
Net credit losses (NCLs)$— $— $— $— $— $— 
Replenishment of NCLs$— $— $— $— $— $— 
Net reserve builds (releases)— 10 2 — 36 48 
Total provision for credit losses$— $10 $2 $— $36 $48 
Other, net$— $— $— $— $— $— 
Allowance for credit losses on other assets at end of quarter$— $18 $7 $— $77 $102 
 
Six Months Ended June 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$— $— $— $— $— $— 
Adjustment to opening balance for CECL adoption6 14 2 1 3 26 
Gross credit losses— — — — — — 
Gross recoveries— — — — — — 
Net credit losses (NCLs)$— $— $— $— $— $— 
Replenishment of NCLs$— $— $— $— $— $— 
Net reserve builds (releases)(6)4 5 (1)42 44 
Total provision for credit losses$(6)$4 $5 $(1)$42 $44 
Other, net$— $— $— $— $32 $32 
Allowance for credit losses on other assets at end of year$— $18 $7 $— $77 $102 

(1) Primarily accounts receivable.