CONSOLIDATED BALANCE SHEET - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Assets
Cash and due from banks (including segregated cash and other deposits)	$ 28,906	$ 26,349
Deposits with banks, net of allowance	294,902	283,266
Securities borrowed and purchased under agreements to resell (including $212,200 and $185,204 as of September 30, 2021 and December 31, 2020, respectively, at fair value), net of allowance	337,696	294,712
Brokerage receivables, net of allowance	59,487	44,806
Trading account assets (including $142,662 and $168,967 pledged to creditors at September 30, 2021 and December 31, 2020, respectively)	342,914	375,079
Investments:
Available-for-sale debt securities (including $8,685 and $5,921 pledged to creditors as of September 30, 2021 and December 31, 2020, respectively), net of allowance	295,573	335,084
Held-to-maturity debt securities (including $1,257 and $547 pledged to creditors as of September 30, 2021 and December 31, 2020, respectively), net of allowance	198,056	104,943
Equity securities (including $918 and $1,066 at fair value as of September 30, 2021 and December 31, 2020, respectively)	7,220	7,332
Total investments	500,849	447,359
Loans:
Loans, net of unearned income	664,764	675,883
Allowance for credit losses on loans (ACLL)	(17,715)	(24,956)
Total loans, net	647,049	650,927
Goodwill	21,573	22,162
Intangible assets (including MSRs of $409 and $336 as of September 30, 2021 and December 31, 2020, respectively, at fair value)	4,553	4,747
Other assets (including $11,895 and $14,613 as of September 30, 2021 and December 31, 2020, respectively, at fair value), net of allowance	123,947	110,683
Total assets	2,361,876	2,260,090
Liabilities
Non-interest-bearing deposits in U.S. offices	145,103	126,942
Interest-bearing deposits in U.S. offices (including $910 and $879 as of September 30, 2021 and December 31, 2020, respectively, at fair value)	567,902	503,213
Non-interest-bearing deposits in offices outside the U.S.	94,016	100,543
Interest-bearing deposits in offices outside the U.S. (including $1,803 and $1,079 as of September 30, 2021 and December 31, 2020, respectively, at fair value)	540,507	549,973
Total deposits	1,347,528	1,280,671
Securities loaned and sold under agreements to repurchase (including $75,262 and $60,206 as of September 30, 2021 and December 31, 2020, respectively, at fair value)	209,184	199,525
Brokerage payables (including $3,423 and $6,835 as of September 30, 2021 and December 31, 2020, respectively, at fair value)	60,501	50,484
Trading account liabilities	179,286	168,027
Short-term borrowings (including $8,814 and $4,683 as of September 30, 2021 and December 31, 2020, respectively, at fair value)	29,683	29,514
Long-term debt (including $78,178 and $67,063 as of September 30, 2021 and December 31, 2020, respectively, at fair value)	258,274	271,686
Other liabilities, net of allowance	75,810	59,983
Total liabilities	2,160,266	2,059,890
Stockholders’ equity
Preferred stock ($1.00 par value; authorized shares: 30 million), issued shares: as of September 30, 2021—719,800 and as of December 31, 2020—779,200, at aggregate liquidation value	17,995	19,480
Common stock ($0.01 par value; authorized shares: 6 billion), issued shares: as of September 30, 2021—3,099,651,835 and as of December 31, 2020—3,099,763,661	31	31
Additional paid-in capital	107,922	107,846
Retained earnings	183,024	168,272
Treasury stock, at cost	(71,246)	(64,129)
Accumulated other comprehensive income (loss) (AOCI)	(36,851)	(32,058)
Total Citigroup stockholders’ equity	200,875	199,442
Noncontrolling interests	735	758
Total equity	201,610	200,200
Total liabilities and equity	2,361,876	2,260,090
Consolidated VIEs
Assets
Cash and due from banks (including segregated cash and other deposits)	194	281
Trading account assets (including $142,662 and $168,967 pledged to creditors at September 30, 2021 and December 31, 2020, respectively)	10,433	8,104
Investments:
Total investments	897	837
Loans:
Loans, net of unearned income	46,257	54,588
Allowance for credit losses on loans (ACLL)	(2,998)	(3,794)
Total loans, net	43,259	50,794
Other assets (including $11,895 and $14,613 as of September 30, 2021 and December 31, 2020, respectively, at fair value), net of allowance	1,186	43
Total assets	55,969	60,059
Liabilities
Short-term borrowings (including $8,814 and $4,683 as of September 30, 2021 and December 31, 2020, respectively, at fair value)	9,472	9,278
Long-term debt (including $78,178 and $67,063 as of September 30, 2021 and December 31, 2020, respectively, at fair value)	13,917	20,405
Other liabilities, net of allowance	751	463
Total liabilities	24,140	30,146
Consumer
Loans:
Loans, net of unearned income	264,250	288,839
Allowance for credit losses on loans (ACLL)	(14,668)	(19,554)
Consumer | Consolidated VIEs
Loans:
Loans, net of unearned income	33,497	37,561
Corporate
Loans:
Loans, net of unearned income	400,514	387,044
Allowance for credit losses on loans (ACLL)	(3,047)	(5,402)
Corporate | Consolidated VIEs
Loans:
Loans, net of unearned income	$ 12,760	$ 17,027