INCENTIVE PLANS	9 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
INCENTIVE PLANS	INCENTIVE PLANS For additional information on Citi’s incentive plans, see Note 7 to the Consolidated Financial Statements in Citi’s 2016 Annual Report on Form 10-K.

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. Also includes disclosure for deferred cash awards and other cash incentive awards.

No definition available.

Name:	c_DisclosureOfCompensationRelatedCostsShareBasedPaymentsAndCashAwardsTextBlock
Namespace Prefix:	c_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration