CONSOLIDATED STATEMENT OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities of continuing operations
Net income before attribution of noncontrolling interests		$ 7,975	$ 2,530
Net income attributable to noncontrolling interests		33	(6)
Citigroup’s net income		7,942	2,536
Loss from discontinued operations, net of taxes		(2)	(18)
Income from continuing operations—excluding noncontrolling interests		7,944	2,554
Adjustments to reconcile net income to net cash provided by (used in) operating activities of continuing operations
Depreciation and amortization		962	927
Provisions for credit losses on loans and unfunded lending commitments		(2,105)	6,934
Realized gains from sales of investments		(401)	(432)
Impairment losses on investments and other assets		69	55
Change in trading account assets		14,405	(88,875)
Change in trading account liabilities		11,090	44,101
Change in brokerage receivables net of brokerage payables		(5,236)	(2,931)
Change in loans HFS		1,561	(1,393)
Change in other assets		(383)	(3,123)
Change in other liabilities		3,047	1,605
Other, net		(7,755)	15,045
Total adjustments		15,254	(28,087)
Net cash provided by (used in) operating activities of continuing operations		23,198	(25,533)
Cash flows from investing activities of continuing operations
Change in securities borrowed and purchased under agreements to resell		(20,360)	(11,214)
Change in loans		9,933	(26,743)
Proceeds from sales and securitizations of loans		323	596
Purchases of investments		(111,187)	(108,658)
Proceeds from sales of investments		46,049	44,399
Proceeds from maturities of investments		35,088	29,203
Capital expenditures on premises and equipment and capitalized software		(830)	(460)
Proceeds from sales of premises and equipment, subsidiaries and affiliates and repossessed assets		10	2
Other, net		40	18
Net cash used in investing activities of continuing operations		(40,934)	(72,857)
Cash flows from financing activities of continuing operations
Dividends paid		(1,356)	(1,365)
Issuance of preferred stock		2,300	1,500
Redemption of preferred stock		(1,500)	(1,500)
Treasury stock acquired		(1,481)	(2,925)
Stock tendered for payment of withholding taxes		(312)	(406)
Change in securities loaned and sold under agreements to repurchase		19,643	55,985
Issuance of long-term debt		15,516	28,927
Payments and redemptions of long-term debt		(22,432)	(13,081)
Change in deposits		20,304	114,321
Change in short-term borrowings		2,573	9,902
Net cash provided by financing activities of continuing operations		33,255	191,358
Effect of exchange rate changes on cash and due from banks		(452)	(967)
Change in cash, due from banks and deposits with banks		15,067	92,001
Cash, due from banks and deposits with banks at beginning of period		309,615	193,919
Cash, due from banks and deposits with banks at end of period		324,682	285,920
Cash, due from banks and deposits with banks at end of period		324,682	285,920
Supplemental disclosure of cash flow information for continuing operations
Cash paid during the period for income taxes		950	1,441
Cash paid during the period for interest		1,729	5,424
Non-cash investing activities
Transfers to loans HFS (Other assets) from loans	[1]	$ 636	$ 224

[1] Operating and finance lease right-of-use assets and lease liabilities represent non-cash investing and financing activities, respectively, and are not included in the non-cash investing activities presented here. See Note 22 to the Consolidated Financial Statements for more information and balances as of March 31, 2021.