INCENTIVE PLANS	9 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
INCENTIVE PLANS	INCENTIVE PLANSFor additional information on Citi’s incentive plans, see Note 7 to the Consolidated Financial Statements in Citi’s 2019 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