v3.25.2
CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (AOCI) - Reclassification out of AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)        
Realized gains and (losses) $ 138 $ 23 $ 259 $ 138
Subtotal, pretax 5,219 4,310 10,667 8,854
Tax effect (1,186) (1,047) (2,526) (2,183)
Income (loss) from continuing operations 4,033 3,263 8,141 6,671
Subtotal, pretax (884) 62 (1,036) 539
Other Noninterest Expense [1] (1,277) (1,723) (2,626) (3,543)
Citigroup's accumulated other comprehensive income (loss)        
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)        
Total amounts reclassified out of AOCI, after-tax 75 228 194 461
Citigroup's accumulated other comprehensive income (loss) | (Gain) loss reclassified from AOCI        
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)        
Total amounts reclassified out of AOCI, after-tax 75 228 194 461
Total tax effect (22) (81) (52) (155)
Total amounts reclassified out of AOCI, pretax 97 309 246 616
Realized gains (losses) on investment securities        
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)        
Total amounts reclassified out of AOCI, after-tax (100) (14) (186) (90)
Realized gains (losses) on investment securities | (Gain) loss reclassified from AOCI        
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)        
Realized gains and (losses) (138) (23) (259) (138)
Gross impairment losses 2 9 5 23
Subtotal, pretax (136) (14) (254) (115)
Tax effect 36 0 68 25
Income (loss) from continuing operations (100) (14) (186) (90)
Debt valuation adjustment (DVA)        
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)        
Total amounts reclassified out of AOCI, after-tax 2 2 6 12
Debt valuation adjustment (DVA) | (Gain) loss reclassified from AOCI        
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)        
Realized gains and (losses) 2 3 7 16
Tax effect 0 (1) (1) (4)
Income (loss) from continuing operations 2 2 6 12
Cash flow hedges        
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)        
Total amounts reclassified out of AOCI, after-tax 128 198 271 458
Cash flow hedges | (Gain) loss reclassified from AOCI        
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)        
Tax effect (40) (63) (86) (146)
Subtotal, pretax 168 261 357 604
Total amounts reclassified out of AOCI, after-tax 128 198 271 458
Cash flow hedges | (Gain) loss reclassified from AOCI | Interest rate contracts        
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)        
Subtotal, pretax 168 260 357 602
Cash flow hedges | (Gain) loss reclassified from AOCI | Foreign exchange contracts        
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)        
Subtotal, pretax 0 1 0 2
Benefit plan adjustments        
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)        
Total amounts reclassified out of AOCI, after-tax 43 44 88 93
Benefit plan adjustments | (Gain) loss reclassified from AOCI        
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)        
Other Noninterest Expense 61 61 121 126
Total amounts reclassified out of AOCI, after-tax 43 44 88 93
Total tax effect (18) (17) (33) (33)
Prior service cost (benefit) | (Gain) loss reclassified from AOCI        
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)        
Other Noninterest Expense (5) (5) (9) (10)
Net actuarial loss | (Gain) loss reclassified from AOCI        
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)        
Other Noninterest Expense 66 64 130 134
Curtailment/settlement impact | (Gain) loss reclassified from AOCI        
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)        
Other Noninterest Expense 0 2 0 2
Excluded component of fair value hedges        
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)        
Total amounts reclassified out of AOCI, after-tax 2 (1) 3 (11)
Excluded component of fair value hedges | (Gain) loss reclassified from AOCI        
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)        
Subtotal, pretax 2 (1) 3 (14)
Tax effect 0 0 0 3
Total amounts reclassified out of AOCI, after-tax 2 (1) 3 (11)
Long-duration insurance contracts        
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)        
Total amounts reclassified out of AOCI, after-tax 0 (1) 0 (1)
Long-duration insurance contracts | (Gain) loss reclassified from AOCI        
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)        
Subtotal, pretax 0 (1) 0 (1)
Tax effect 0 0 0 0
Total amounts reclassified out of AOCI, after-tax 0 (1) 0 (1)
Foreign currency translation adjustment (CTA)        
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)        
Total amounts reclassified out of AOCI, after-tax 0 0 12 0
Foreign currency translation adjustment (CTA) | (Gain) loss reclassified from AOCI        
Pretax and after-tax amounts reclassified out of accumulated other comprehensive income (loss)        
Subtotal, pretax 0 0 12 0
Tax effect 0 0 0 0
Total amounts reclassified out of AOCI, after-tax $ 0 $ 0 $ 12 $ 0
[1]     Effective January 1, 2025, certain transaction processing fees paid by Citi, primarily to credit card networks, which were previously presented within Other operating expenses, are presented as contra-revenue within Commissions and fees reported in Non-interest revenue. Prior periods were conformed to reflect this change in presentation.