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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - AOCI Components Pre Post & Tax Effect (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net unrealized gains (losses), net | $ 207 | $ 991 | $ 836 | $ 259
Reclassification from AOCI, net | 165 | 218 | 492 | 573
Total other comprehensive income (loss), before tax | 504 | 1,630 | 1,800 | 1,123
Total other comprehensive income (loss), tax | (132) | (421) | (472) | (291)
Total other comprehensive income (loss), net | 372 | 1,209 | 1,328 | 832
Net unrealized gains (losses) on cash flow hedges |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net unrealized gains (losses), before tax | (21) | 613 | 376 | (114)
Net unrealized gains (losses), tax | 5 | (163) | (101) | 30
Net unrealized gains (losses), net | (16) | 450 | 275 | (84)
Reclassification from AOCI | 197 | 276 | 597 | 711
Reclassification from AOCI, tax | (53) | (73) | (160) | (189)
Reclassification from AOCI, net | 144 | 203 | 437 | 522
Total other comprehensive income (loss), before tax | 176 | 889 | 973 | 597
Total other comprehensive income (loss), tax | (48) | (236) | (261) | (159)
Total other comprehensive income (loss), net | 128 | 653 | 712 | 438
Net unrealized gains (losses) on investment securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net unrealized gains (losses), before tax | 300 | 720 | 753 | 453
Net unrealized gains (losses), tax | (77) | (179) | (192) | (114)
Net unrealized gains (losses), net | 223 | 541 | 561 | 339
Reclassification from AOCI | 24 | 18 | 64 | 56
Reclassification from AOCI, tax | (6) | (5) | (16) | (14)
Reclassification from AOCI, net | 18 | 13 | 48 | 42
Total other comprehensive income (loss), before tax | 324 | 738 | 817 | 509
Total other comprehensive income (loss), tax | (83) | (184) | (208) | (128)
Total other comprehensive income (loss), net | 241 | 554 | 609 | 381
Defined benefit plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net unrealized gains (losses), net | 0 | 0 | 0 | 4
Reclassification from AOCI, net | 3 | 2 | 7 | 9
Total other comprehensive income (loss), before tax | 4 | 3 | 10 | 17
Total other comprehensive income (loss), tax | (1) | (1) | (3) | (4)
Total other comprehensive income (loss), net | 3 | 2 | 7 | 13
Net actuarial gain (loss) arising during the period |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net unrealized gains (losses), before tax | 0 | 0 | 0 | 5
Net unrealized gains (losses), tax | 0 | 0 | 0 | (1)
Net unrealized gains (losses), net | 0 | 0 | 0 | 4
Amortization of actuarial (gain) loss to earnings |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification from AOCI | 4 | 3 | 10 | 12
Reclassification from AOCI, tax | (1) | (1) | (3) | (3)
Reclassification from AOCI, net | $ 3 | $ 2 | $ 7 | $ 9

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