CONSOLIDATED BALANCE SHEET - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Assets
Cash and due from banks (including segregated cash and other deposits)	$ 26,204	$ 26,349
Deposits with banks, net of allowance	298,478	283,266
Securities borrowed and purchased under agreements to resell (including $198,908 and $185,204 as of March 31, 2021 and December 31, 2020, respectively, at fair value), net of allowance	315,072	294,712
Brokerage receivables, net of allowance	60,465	44,806
Trading account assets (including $175,125 and $168,967 pledged to creditors at March 31, 2021 and December 31, 2020, respectively)	360,659	375,079
Investments:
Available-for-sale debt securities (including $6,740 and $5,921 pledged to creditors as of March 31, 2021 and December 31, 2020, respectively), net of allowance	304,036	335,084
Held-to-maturity debt securities (including $1,031 and $547 pledged to creditors as of March 31, 2021 and December 31, 2020, respectively), net of allowance	161,742	104,943
Equity securities (including $784 and $1,066 at fair value as of March 31, 2021 and December 31, 2020, respectively)	7,181	7,332
Total investments	472,959	447,359
Loans:
Loans, net of unearned income	665,988	675,883
Allowance for credit losses on loans (ACLL)	(21,638)	(24,956)
Total loans, net	644,350	650,927
Goodwill	21,905	22,162
Intangible assets (including MSRs of $433 and $336 as of March 31, 2021 and December 31, 2020, respectively, at fair value)	4,741	4,747
Other assets (including $10,175 and $14,613 as of March 31, 2021 and December 31, 2020, respectively, at fair value), net of allowance	109,433	110,683
Total assets	2,314,266	2,260,090
Liabilities
Non-interest-bearing deposits in U.S. offices	138,192	126,942
Interest-bearing deposits in U.S. offices (including $962 and $879 as of March 31, 2021 and December 31, 2020, respectively, at fair value)	497,335	503,213
Non-interest-bearing deposits in offices outside the U.S.	101,662	100,543
Interest-bearing deposits in offices outside the U.S. (including $2,178 and $1,079 as of March 31, 2021 and December 31, 2020, respectively, at fair value)	563,786	549,973
Total deposits	1,300,975	1,280,671
Securities loaned and sold under agreements to repurchase (including $68,713 and $60,206 as of March 31, 2021 and December 31, 2020, respectively, at fair value)	219,168	199,525
Brokerage payables	60,907	50,484
Trading account liabilities	179,117	168,027
Short-term borrowings (including $7,406 and $4,683 as of March 31, 2021 and December 31, 2020, respectively, at fair value)	32,087	29,514
Long-term debt (including $68,071 and $67,063 as of March 31, 2021 and December 31, 2020, respectively, at fair value)	256,335	271,686
Other liabilities (including $2,675 and $6,835 as of March 31, 2021 and December 31, 2020, respectively, at fair value), including allowance	62,404	59,983
Total liabilities	2,110,993	2,059,890
Stockholders’ equity
Preferred stock ($1.00 par value; authorized shares: 30 million), issued shares: as of March 31, 2021—811,200 and as of December 31, 2020—779,200, at aggregate liquidation value	20,280	19,480
Common stock ($0.01 par value; authorized shares: 6 billion), issued shares: as of March 31, 2021—3,099,690,888 and as of December 31, 2020—3,099,763,661	31	31
Additional paid-in capital	107,694	107,846
Retained earnings	174,816	168,272
Treasury stock, at cost: March 31, 2021—1,032,643,369 shares and December 31, 2020—1,017,674,452 shares	(65,261)	(64,129)
Accumulated other comprehensive income (loss) (AOCI)	(35,011)	(32,058)
Total Citigroup stockholders’ equity	202,549	199,442
Noncontrolling interests	724	758
Total equity	203,273	200,200
Total liabilities and equity	2,314,266	2,260,090
Consolidated VIEs
Assets
Cash and due from banks (including segregated cash and other deposits)	156	281
Trading account assets (including $175,125 and $168,967 pledged to creditors at March 31, 2021 and December 31, 2020, respectively)	7,659	8,104
Investments:
Total investments	903	837
Loans:
Loans, net of unearned income	51,303	54,588
Allowance for credit losses on loans (ACLL)	(3,416)	(3,794)
Total loans, net	47,887	50,794
Other assets (including $10,175 and $14,613 as of March 31, 2021 and December 31, 2020, respectively, at fair value), net of allowance	51	43
Total assets	56,656	60,059
Liabilities
Short-term borrowings (including $7,406 and $4,683 as of March 31, 2021 and December 31, 2020, respectively, at fair value)	9,344	9,278
Long-term debt (including $68,071 and $67,063 as of March 31, 2021 and December 31, 2020, respectively, at fair value)	15,699	20,405
Other liabilities (including $2,675 and $6,835 as of March 31, 2021 and December 31, 2020, respectively, at fair value), including allowance	384	463
Total liabilities	25,427	30,146
Consumer
Loans:
Loans, net of unearned income	274,034	288,839
Allowance for credit losses on loans (ACLL)	(17,554)	(19,554)
Consumer | Consolidated VIEs
Loans:
Loans, net of unearned income	34,514	37,561
Corporate
Loans:
Loans, net of unearned income	391,954	387,044
Allowance for credit losses on loans (ACLL)	(4,084)	(5,402)
Corporate | Consolidated VIEs
Loans:
Loans, net of unearned income	$ 16,789	$ 17,027