CONSOLIDATED STATEMENT OF CASH FLOWS (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities of continuing operations
Net income before attribution of noncontrolling interests	$ 7,502us-gaap_ProfitLoss	$ 13,886us-gaap_ProfitLoss	$ 7,710us-gaap_ProfitLoss
Net income attributable to noncontrolling interests	192	227	219
Citigroup’s net income	7,310us-gaap_NetIncomeLoss	13,659us-gaap_NetIncomeLoss	7,491us-gaap_NetIncomeLoss
Loss from discontinued operations, net of taxes	(2)	(90)	(57)
Gain (loss) on sale, net of taxes	0	360	(1)
Income from continuing operations-excluding noncontrolling interests	7,312	13,389	7,549
Adjustments to reconcile net income to net cash provided by operating activities of continuing operations
Amortization of deferred policy acquisition costs and present value of future profits	210	194	203
(Additions) reductions to deferred policy acquisition costs	(64)	(54)	85
Depreciation and amortization	3,589	3,303	2,507
Deferred tax provision (benefit)	3,347us-gaap_DeferredIncomeTaxExpenseBenefit	2,699us-gaap_DeferredIncomeTaxExpenseBenefit	(3,701)us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for loan losses	6,828us-gaap_ProvisionForLoanLossesExpensed	7,604us-gaap_ProvisionForLoanLossesExpensed	10,458us-gaap_ProvisionForLoanLossesExpensed
Realized gains from sales of investments	(570)us-gaap_GainLossOnSaleOfSecuritiesNet	(748)us-gaap_GainLossOnSaleOfSecuritiesNet	(3,251)us-gaap_GainLossOnSaleOfSecuritiesNet
Net impairment losses recognized in earnings	426	535	4,971
Change in trading account assets	(10,858)	35,001	(29,195)
Change in trading account liabilities	30,274	(6,787)	(10,533)
Change in brokerage receivables net of brokerage payables	(4,272)	(6,490)	945
Change in loans held-for-sale	(1,144)	4,321	(1,106)
Change in other assets	378	13,028	(878)
Change in other liabilities	4,544	(7,880)	(1,457)
Other, net	5,434us-gaap_OtherNoncashIncomeExpense	5,129us-gaap_OtherNoncashIncomeExpense	13,041us-gaap_OtherNoncashIncomeExpense
Total adjustments	38,122	49,855	(17,911)
Net cash provided by (used in) operating activities of continuing operations	45,434	63,244	(10,362)
Cash flows from investing activities of continuing operations
Change in deposits with banks	40,916	(66,871)	53,650
Change in federal funds sold and securities borrowed or purchased under agreements to resell	14,467	4,274	14,538
Change in loans	1,170	(30,198)	(31,591)
Proceeds from sales and securitizations of loans	4,752	9,123	7,287
Purchases of investments	(258,992)us-gaap_PaymentsToAcquireInvestments	(220,823)us-gaap_PaymentsToAcquireInvestments	(256,907)us-gaap_PaymentsToAcquireInvestments
Proceeds from sales of investments	135,824	131,100	143,853
Proceeds from maturities of investments	94,117	84,831	102,020
Capital expenditures on premises and equipment and capitalized software	(3,386)	(3,490)	(3,604)
Proceeds from sales of premises and equipment, subsidiaries and affiliates, and repossessed assets	623	716	1,089
Net cash provided by (used in) investing activities of continuing operations	29,491	(91,338)	30,335
Cash flows from financing activities of continuing operations
Dividends paid	(633)us-gaap_PaymentsOfDividends	(314)us-gaap_PaymentsOfDividends	(143)us-gaap_PaymentsOfDividends
Issuance of preferred stock	3,699	4,192	2,250
Redemption of preferred stock	0	(94)	0
Treasury stock acquired	(1,232)	(837)	(5)
Stock tendered for payment of withholding taxes	(508)	(452)	(194)
Change in federal funds purchased and securities loaned or sold under agreements to repurchase	(30,074)	(7,724)	12,863
Issuance of long-term debt	66,836	54,405	27,843
Payments and redemptions of long-term debt	(58,923)	(63,994)	(117,575)
Change in deposits	(48,336)us-gaap_IncreaseDecreaseInDeposits	37,713us-gaap_IncreaseDecreaseInDeposits	64,624us-gaap_IncreaseDecreaseInDeposits
Change in short-term borrowings	(1,099)	199	(2,164)
Net cash provided by (used in) financing activities of continuing operations	(70,270)	23,094	(12,501)
Effect of exchange rate changes on cash and cash equivalents	(2,432)	(1,558)	274
Discontinued operations
Net cash used in discontinued operations	0	(10)	6
Change in cash and due from banks	2,223	(6,568)	7,752
Cash and due from banks at beginning of period	29,885us-gaap_CashAndDueFromBanks	36,453us-gaap_CashAndDueFromBanks	28,701us-gaap_CashAndDueFromBanks
Cash and due from banks at end of period	32,108us-gaap_CashAndDueFromBanks	29,885us-gaap_CashAndDueFromBanks	36,453us-gaap_CashAndDueFromBanks
Supplemental disclosure of cash flow information for continuing operations
Cash paid during the year for income taxes	4,632us-gaap_IncomeTaxesPaidNet	4,495us-gaap_IncomeTaxesPaidNet	3,900us-gaap_IncomeTaxesPaidNet
Cash paid during the year for interest	12,868us-gaap_InterestPaidNet	14,383us-gaap_InterestPaidNet	19,739us-gaap_InterestPaidNet
Non-cash investing activities
Change in loans due to consolidation/deconsolidation of VIEs	(374)	6,718	0
Transfers to loans held-for-sale from loans	12,700	17,300	8,700
Transfers to OREO and other repossessed assets	321us-gaap_TransferToOtherRealEstate	325us-gaap_TransferToOtherRealEstate	500us-gaap_TransferToOtherRealEstate
Non-cash financing activities
Decrease in deposits associated with reclassification to HFS	(20,605)	0	0
Increase in short-term borrowings due to consolidation of VIEs	500	6,718	0
Decrease in long-term debt due to deconsolidation of VIEs	$ (864)	$ 0	$ 0

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Amount of deferred policy acquisition costs and capitalized present value of future profits (also known as VOBA) charged to expense in the period, generally in proportion to related revenue earned, estimated gross profits, or over the customer relationship or some other period.

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This element represents gain (loss) on sale of discontinued operations affecting cash flows during the period.

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Increase (Decrease) in Loans Due to Consolidation of Variable Interest Entity

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The aggregate amount of adjustments to net income or loss necessary to remove the effects of all items whose cash effects are investing or financing cash flows. The aggregate amount also includes all noncash expenses and income items which reduce or increase net income and are thus added back or deducted when calculating cash provided by or used in operating activities.

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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After tax income (loss) from operations of a business component (exclusive of any gain (loss) on disposal, or provision therefore) during the reporting period, until its disposal.

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The effect of exchange rate changes on cash balances in continuing operations held in foreign currencies.

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The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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The increase (decrease) during the reporting period in the aggregate amount of trading liabilities from the reporting entity's trading activities. This include liabilities resulting from sales of assets that the reporting entity does not own and revaluation losses.

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