v3.25.4
CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (AOCI) - Change in Each Component of AOCI (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 15, 2025
Change in accumulated other comprehensive income (loss)        
Beginning of year balance, net of tax $ 209,366 $ 206,251    
End of year balance, net of tax 213,822 209,366 $ 206,251  
Liability for insurance 501 413    
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Banamex        
Change in accumulated other comprehensive income (loss)        
Ownership percentage       0.25
Accumulated other comprehensive income (loss)        
Change in accumulated other comprehensive income (loss)        
Beginning of year balance, net of tax (47,852) (44,800) (47,062)  
Banamex equity interest sale 2,413      
Other comprehensive income before reclassifications 3,085 (4,010) 713  
Increase (decrease) due to amounts reclassified from AOCI 457 958 1,522  
Change, net of taxes   (3,052) 2,235  
Change, net of taxes 5,955      
End of year balance, net of tax (41,897) (47,852) (44,800)  
Accumulated other comprehensive income (loss) | Cumulative effect of adoption        
Change in accumulated other comprehensive income (loss)        
Beginning of year balance, net of tax [1]     27  
Accumulated other comprehensive income (loss) | Adjusted balance        
Change in accumulated other comprehensive income (loss)        
Beginning of year balance, net of tax (47,852) (44,800) (47,035)  
End of year balance, net of tax   (47,852) (44,800)  
Net unrealized gains (losses) on debt securities        
Change in accumulated other comprehensive income (loss)        
Beginning of year balance, net of tax (2,837) (3,744) (5,998)  
Banamex equity interest sale (34)      
Other comprehensive income before reclassifications 1,842 913 2,266  
Increase (decrease) due to amounts reclassified from AOCI (211) (6) (12)  
Change, net of taxes 1,597 907 2,254  
Change, net of taxes 1,597      
End of year balance, net of tax (1,240) (2,837) (3,744)  
Net unrealized gains (losses) on debt securities | Cumulative effect of adoption        
Change in accumulated other comprehensive income (loss)        
Beginning of year balance, net of tax     0  
Net unrealized gains (losses) on debt securities | Adjusted balance        
Change in accumulated other comprehensive income (loss)        
Beginning of year balance, net of tax     (5,998)  
Debt valuation adjustment (DVA)        
Change in accumulated other comprehensive income (loss)        
Beginning of year balance, net of tax (1,121) (709) 842  
Banamex equity interest sale 0      
Other comprehensive income before reclassifications (1,058) (429) (1,553)  
Increase (decrease) due to amounts reclassified from AOCI 36 17 2  
Change, net of taxes (1,022) (412) (1,551)  
Change, net of taxes (1,022)      
End of year balance, net of tax (2,143) (1,121) (709)  
Debt valuation adjustment (DVA) | Cumulative effect of adoption        
Change in accumulated other comprehensive income (loss)        
Beginning of year balance, net of tax     0  
Debt valuation adjustment (DVA) | Adjusted balance        
Change in accumulated other comprehensive income (loss)        
Beginning of year balance, net of tax     842  
Cash flow hedges        
Change in accumulated other comprehensive income (loss)        
Beginning of year balance, net of tax (220) (1,406) (2,522)  
Banamex equity interest sale 0      
Other comprehensive income before reclassifications (202) 405 (327)  
Increase (decrease) due to amounts reclassified from AOCI 432 781 1,443  
Change, net of taxes   1,186 1,116  
Change, net of taxes 230      
End of year balance, net of tax 10 (220) (1,406)  
Cash flow hedges | Cumulative effect of adoption        
Change in accumulated other comprehensive income (loss)        
Beginning of year balance, net of tax     0  
Cash flow hedges | Adjusted balance        
Change in accumulated other comprehensive income (loss)        
Beginning of year balance, net of tax     (2,522)  
Benefit plans        
Change in accumulated other comprehensive income (loss)        
Beginning of year balance, net of tax (5,627) (6,050) (5,755)  
Banamex equity interest sale 214      
Other comprehensive income before reclassifications (276) 242 (416)  
Increase (decrease) due to amounts reclassified from AOCI 185 181 121  
Change, net of taxes 123 423 (295)  
Change, net of taxes 123      
End of year balance, net of tax (5,504) (5,627) (6,050)  
Benefit plans | Cumulative effect of adoption        
Change in accumulated other comprehensive income (loss)        
Beginning of year balance, net of tax     0  
Benefit plans | Adjusted balance        
Change in accumulated other comprehensive income (loss)        
Beginning of year balance, net of tax     (5,755)  
CTA, net of hedges        
Change in accumulated other comprehensive income (loss)        
Beginning of year balance, net of tax (38,047) (32,885) (33,637)  
Banamex equity interest sale 2,243      
Other comprehensive income before reclassifications 2,775 (5,162) 752  
Increase (decrease) due to amounts reclassified from AOCI 13 0 0  
Change, net of taxes 5,031 (5,162) 752  
Change, net of taxes 5,031      
End of year balance, net of tax (33,016) (38,047) (32,885)  
CTA, net of hedges | Cumulative effect of adoption        
Change in accumulated other comprehensive income (loss)        
Beginning of year balance, net of tax     0  
CTA, net of hedges | Adjusted balance        
Change in accumulated other comprehensive income (loss)        
Beginning of year balance, net of tax     (33,637)  
Excluded component of fair value hedges        
Change in accumulated other comprehensive income (loss)        
Beginning of year balance, net of tax (52) (40) 8  
Banamex equity interest sale 1      
Other comprehensive income before reclassifications 15 2 (16)  
Increase (decrease) due to amounts reclassified from AOCI 2 (14) (32)  
Change, net of taxes   (12) (48)  
Change, net of taxes 18      
End of year balance, net of tax (34) (52) (40)  
Excluded component of fair value hedges | Cumulative effect of adoption        
Change in accumulated other comprehensive income (loss)        
Beginning of year balance, net of tax     0  
Excluded component of fair value hedges | Adjusted balance        
Change in accumulated other comprehensive income (loss)        
Beginning of year balance, net of tax     8  
Long-duration insurance contracts        
Change in accumulated other comprehensive income (loss)        
Beginning of year balance, net of tax 52 34 0  
Banamex equity interest sale (11)      
Other comprehensive income before reclassifications (11) 19 7  
Increase (decrease) due to amounts reclassified from AOCI 0 (1) 0  
Change, net of taxes (22) 18 7  
Change, net of taxes (22)      
End of year balance, net of tax 30 52 34  
Long-duration insurance contracts | Cumulative effect of adoption        
Change in accumulated other comprehensive income (loss)        
Beginning of year balance, net of tax     27  
Long-duration insurance contracts | Adjusted balance        
Change in accumulated other comprehensive income (loss)        
Beginning of year balance, net of tax     27  
Change in Noncontrolling interests’ AOCI, not included above:        
Change in accumulated other comprehensive income (loss)        
Increase (decrease) due to amounts reclassified from AOCI 125 (61) 84  
Net unrealized gains (losses) on debt securities        
Change in accumulated other comprehensive income (loss)        
Increase (decrease) due to amounts reclassified from AOCI 19 (11) 43  
Debt valuation adjustment (DVA)        
Change in accumulated other comprehensive income (loss)        
Increase (decrease) due to amounts reclassified from AOCI 0 0 0  
Cash flow hedges        
Change in accumulated other comprehensive income (loss)        
Increase (decrease) due to amounts reclassified from AOCI 0 0 0  
Benefit plans        
Change in accumulated other comprehensive income (loss)        
Increase (decrease) due to amounts reclassified from AOCI (23) 0 0  
CTA, net of hedges        
Change in accumulated other comprehensive income (loss)        
Increase (decrease) due to amounts reclassified from AOCI 129 (50) 41  
Excluded component of fair value hedges        
Change in accumulated other comprehensive income (loss)        
Increase (decrease) due to amounts reclassified from AOCI 0 0 0  
Long-duration insurance contracts        
Change in accumulated other comprehensive income (loss)        
Increase (decrease) due to amounts reclassified from AOCI $ 0 $ 0 $ 0  
[1] See “Accounting Changes” in Note 1.