v3.25.2
CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (AOCI) - Schedule of Pre-Tax and After-Tax (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Change in accumulated other comprehensive income (loss), after-tax        
Balance, beginning of period     $ 209,366  
Balance, end of period $ 214,130 $ 209,144 214,130 $ 209,144
Citigroup's accumulated other comprehensive income (loss)        
Change in accumulated other comprehensive income (loss), pretax        
Balance, beginning of period, pretax (51,933) (53,391) (54,439) (52,422)
Other comprehensive income (loss), pretax 2,006 (711) 4,512 (1,680)
Balance, end of period, pretax (49,927) (54,102) (49,927) (54,102)
Change in accumulated other comprehensive income (loss), tax effect        
Balance, beginning of period, tax effect 6,211 7,662 6,587 7,622
Other comprehensive income (loss), tax effect (70) (237) (446) (197)
Balance, end of period, tax effect 6,141 7,425 6,141 7,425
Change in accumulated other comprehensive income (loss), after-tax        
Balance, beginning of period (45,722) (45,729) (47,852) (44,800)
Total other comprehensive income 1,936 (948) 4,066 (1,877)
Balance, end of period (43,786) (46,677) (43,786) (46,677)
Citigroup's accumulated other comprehensive income (loss) | Adjusted balance, beginning of period        
Change in accumulated other comprehensive income (loss), after-tax        
Balance, beginning of period       (44,800)
Change in net unrealized gains (losses) on debt securities        
Change in accumulated other comprehensive income (loss), pretax        
Other comprehensive income (loss), pretax 363 (52) 1,107 72
Change in accumulated other comprehensive income (loss), tax effect        
Other comprehensive income (loss), tax effect (85) 14 (314) (10)
Change in accumulated other comprehensive income (loss), after-tax        
Balance, beginning of period (2,322) (3,644) (2,837) (3,744)
Total other comprehensive income 278 (38) 793 62
Balance, end of period (2,044) (3,682) (2,044) (3,682)
Debt valuation adjustment (DVA)        
Change in accumulated other comprehensive income (loss), pretax        
Other comprehensive income (loss), pretax (391) 343 609 (407)
Change in accumulated other comprehensive income (loss), tax effect        
Other comprehensive income (loss), tax effect 49 (87) (172) 100
Change in accumulated other comprehensive income (loss), after-tax        
Balance, beginning of period (342) (1,272) (1,121) (709)
Total other comprehensive income (342) 256 437 (307)
Balance, end of period (684) (1,016) (684) (1,016)
Excluded component of fair value hedges        
Change in accumulated other comprehensive income (loss), after-tax        
Balance, beginning of period (45) (42) (52) (40)
Total other comprehensive income 0 3 7 1
Balance, end of period (45) (39) (45) (39)
Benefit plans        
Change in accumulated other comprehensive income (loss), pretax        
Other comprehensive income (loss), pretax (57) 250 (75) 318
Change in accumulated other comprehensive income (loss), tax effect        
Other comprehensive income (loss), tax effect 20 (71) 12 (62)
Change in accumulated other comprehensive income (loss), after-tax        
Balance, beginning of period (5,653) (5,973) (5,627) (6,050)
Total other comprehensive income (37) 179 (63) 256
Balance, end of period (5,690) (5,794) (5,690) (5,794)
Foreign currency translation adjustment (CTA)        
Change in accumulated other comprehensive income (loss), pretax        
Other comprehensive income (loss), pretax 2,003 (1,622) 2,767 (2,711)
Change in accumulated other comprehensive income (loss), tax effect        
Other comprehensive income (loss), tax effect (37) (12) 48 23
Change in accumulated other comprehensive income (loss), after-tax        
Balance, beginning of period (37,198) (33,939) (38,047) (32,885)
Total other comprehensive income 1,966 (1,634) 2,815 (2,688)
Balance, end of period (35,232) (35,573) (35,232) (35,573)
Long-duration insurance contracts        
Change in accumulated other comprehensive income (loss), pretax        
Other comprehensive income (loss), pretax 2 4 0 36
Change in accumulated other comprehensive income (loss), tax effect        
Other comprehensive income (loss), tax effect (3) (3) (2) (14)
Change in accumulated other comprehensive income (loss), after-tax        
Balance, beginning of period 51 55 52 34
Total other comprehensive income (1) 1 (2) 22
Balance, end of period 50 56 50 56
Cash flow hedges | Excluded component of fair value hedges        
Change in accumulated other comprehensive income (loss), pretax        
Other comprehensive income (loss), pretax 88 364 96 1,014
Change in accumulated other comprehensive income (loss), tax effect        
Other comprehensive income (loss), tax effect (16) (79) (17) (237)
Change in accumulated other comprehensive income (loss), after-tax        
Total other comprehensive income 72 285 79 777
Excluded component of fair value hedges | Excluded component of fair value hedges        
Change in accumulated other comprehensive income (loss), pretax        
Other comprehensive income (loss), pretax (2) 2 8 (2)
Change in accumulated other comprehensive income (loss), tax effect        
Other comprehensive income (loss), tax effect 2 1 (1) 3
Change in accumulated other comprehensive income (loss), after-tax        
Total other comprehensive income $ 0 $ 3 $ 7 $ 1