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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance $ 26,172 $ 24,866 $ 26,317 $ 24,254
Other comprehensive income (loss) before reclassifications (251) 139 (475) 629
Amounts reclassified from AOCI to earnings 78 163 184 327
Total other comprehensive income (loss), net (173) 302 (291) 956
Ending balance 26,183 25,234 26,183 25,234
Total AOCI        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (2,088) (2,941) (1,970) (3,595)
Total other comprehensive income (loss), net (173) 302 (291) 956
Ending balance (2,261) (2,639) (2,261) (2,639)
Net Unrealized Gains (Losses) on Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (159) (569) (118) (925)
Other comprehensive income (loss) before reclassifications (180) 83 (304) 291
Amounts reclassified from AOCI to earnings 53 145 136 293
Total other comprehensive income (loss), net (127) 228 (168) 584
Ending balance (286) (341) (286) (341)
Net Unrealized Gains (Losses) on Investment Securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (1,684) (2,074) (1,603) (2,369)
Other comprehensive income (loss) before reclassifications (71) 56 (171) 338
Amounts reclassified from AOCI to earnings 24 17 43 30
Total other comprehensive income (loss), net (47) 73 (128) 368
Ending balance (1,731) (2,001) (1,731) (2,001)
Defined Benefit Plans        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (245) (298) (249) (301)
Other comprehensive income (loss) before reclassifications 0 0 0 0
Amounts reclassified from AOCI to earnings 1 1 5 4
Total other comprehensive income (loss), net 1 1 5 4
Ending balance $ (244) $ (297) $ (244) $ (297)