CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities of continuing operations
Citigroup’s net income		$ 18,080	$ (6,738)	$ 14,975
Net income attributable to noncontrolling interests		35	60	63
Citigroup’s net income (loss)		18,045	(6,798)	14,912
Loss from discontinued operations, net of taxes		(8)	(111)	(58)
Income (loss) from continuing operations—excluding noncontrolling interests		18,053	(6,687)	14,970
Adjustments to reconcile net income to net cash provided by operating activities of continuing operations
Net gains on significant disposals	[1]	(247)	(602)	(404)
Depreciation and amortization		3,754	3,659	3,720
Deferred tax provision	[2]	(51)	24,877	1,459
Provision for loan losses		7,354	7,503	6,749
Realized gains from sales of investments		(421)	(778)	(948)
Net impairment losses on investments, goodwill and intangible assets		132	91	621
Change in trading account assets		(3,469)	(7,038)	(3,092)
Change in trading account liabilities		19,135	(15,375)	21,409
Change in brokerage receivables, net of brokerage payables		6,163	(5,307)	2,226
Change in loans HFS		770	247	6,603
Change in other assets		(5,791)	(3,364)	(6,676)
Change in other liabilities		(871)	(3,044)	96
Other, net		(7,559)	(2,956)	7,000
Total adjustments		18,899	(2,087)	38,763
Net cash provided by (used in) operating activities of continuing operations		36,952	(8,774)	53,733
Cash flows from investing activities of continuing operations
Change in federal funds sold and securities borrowed or purchased under agreements to resell		(38,206)	4,335	(17,138)
Change in loans		(29,002)	(58,062)	(39,761)
Proceeds from sales and securitizations of loans		4,549	8,365	18,140
Purchases of investments		(186,987)	(185,740)	(211,402)
Proceeds from sales of investments	[3]	61,491	107,368	132,183
Proceeds from maturities of investments		118,104	84,369	65,525
Proceeds from significant disposals	[1]	314	3,411	265
Capital expenditures on premises and equipment and capitalized software		(3,774)	(3,361)	(2,756)
Proceeds from sales of premises and equipment, subsidiaries and affiliates and repossessed assets		212	377	667
Other, net		181	187	142
Net cash used in investing activities of continuing operations		(73,118)	(38,751)	(54,135)
Cash flows from financing activities of continuing operations
Dividends paid		(5,020)	(3,797)	(2,287)
Issuance (redemption) of preferred stock		(793)	0	2,498
Treasury stock acquired		(14,433)	(14,541)	(9,290)
Stock tendered for payment of withholding taxes		(482)	(405)	(316)
Change in federal funds purchased and securities loaned or sold under agreements to repurchase		21,491	14,456	(4,675)
Issuance of long-term debt		60,655	67,960	63,806
Payments and redemptions of long-term debt		(58,132)	(40,986)	(55,460)
Change in deposits		53,348	30,416	24,394
Change in short-term borrowings		(12,106)	13,751	9,622
Net cash provided by financing activities of continuing operations		44,528	66,854	28,292
Effect of exchange rate changes on cash and cash equivalents		(773)	693	(493)
Change in cash and due from banks and deposits with banks	[4]	7,589	20,022	27,397
Cash, due from banks and deposits with banks at begining of period	[4]	180,516	160,494	133,097
Cash, due from banks and deposits with banks at end of period	[4]	188,105	180,516	160,494
Cash, due from banks and deposits with banks at end of period	[4]	180,516	160,494	133,097
Supplemental disclosure of cash flow information for continuing operations
Cash paid during the year for income taxes		4,313	2,083	4,359
Cash paid during the year for interest		22,963	15,675	12,067
Non-cash investing activities
Transfers to loans HFS from loans		4,200	5,900	13,900
Transfers to OREO and other repossessed assets		$ 151	$ 113	$ 165

[1] See Note 2 to the Consolidated Financial Statements for further information on significant disposals.

[2] Includes the full impact of the $22.6 billion non-cash charge related to the Tax Cuts and Jobs Act (Tax Reform) in 2017. See Notes 1 and 9 to the Consolidated Financial Statements for further information.

[3] Proceeds for 2016 include approximately $3.3 billion from the sale of Citi’s investment in China Guangfa Bank.

[4] Includes the impact of ASU 2016-18, Restricted Cash. See Notes 1 and 26 to the Consolidated Financial Statements.