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Accumulated Other Comprehensive Income (Loss) - Reconciliation of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance | $ 61,896 | $ 56,885 | $ 59,040 | $ 55,771
Changes in unrealized gains (losses), Investment Securities Available-For-Sale | 975 | 1,297 | 1,681 | 1,048
Changes in unrealized gains (losses), Derivative Hedges | (5) | 460 | 436 | 8
Changes in unrealized gains (losses), Debit Valuation Adjustments | (5) | 0 | (8) | 0
Changes in unrealized gains (losses) | 965 | 1,757 | 2,109 | 1,056
Foreign currency translation adjustment | (1) | 12 | (5) | 16
Reclassification to earnings of realized (gains) losses | 195 | 328 | 609 | 736
Applicable income taxes | (298) | (535) | (697) | (458)
Ending Balance | 63,798 | 59,321 | 63,798 | 59,321
Total |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance | (8,609) | (10,308) | (9,764) | (10,096)
Ending Balance | (7,748) | (8,746) | (7,748) | (8,746)
Unrealized Gains (Losses) on Investment Securities Available-For-Sale |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance | (4,513) | (5,310) | (5,078) | (5,151)
Changes in unrealized gains (losses), Investment Securities Available-For-Sale | 975 | 1,297 | 1,681 | 1,048
Reclassification to earnings of realized (gains) losses | 7 | 119 | 64 | 153
Applicable income taxes | (248) | (361) | (446) | (305)
Ending Balance | (3,779) | (4,255) | (3,779) | (4,255)
Unrealized Gains (Losses) on Investment Securities Transferred From Available-For-Sale to Held-To-Maturity |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance | (2,992) | (3,354) | (3,165) | (3,537)
Reclassification to earnings of realized (gains) losses | 124 | 132 | 358 | 377
Applicable income taxes | (32) | (33) | (93) | (95)
Ending Balance | (2,900) | (3,255) | (2,900) | (3,255)
Unrealized Gains (Losses) on Derivative Hedges |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance | (132) | (482) | (553) | (242)
Changes in unrealized gains (losses), Derivative Hedges | (5) | 460 | 436 | 8
Reclassification to earnings of realized (gains) losses | 65 | 77 | 191 | 206
Applicable income taxes | (15) | (138) | (161) | (55)
Ending Balance | (87) | (83) | (87) | (83)
Unrealized Gains (Losses) on Retirement Plans |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance | (954) | (1,138) | (955) | (1,138)
Reclassification to earnings of realized (gains) losses | (1) |  | (4) |
Applicable income taxes | (4) |  |  |
Ending Balance | (959) | (1,138) | (959) | (1,138)
Debit Valuation Adjustments |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance | (1) | 0 | 1 | 0
Changes in unrealized gains (losses), Derivative Hedges |  |  | (8) |
Changes in unrealized gains (losses), Debit Valuation Adjustments | (5) |  |  |
Applicable income taxes | 1 |  | 2 |
Ending Balance | (5) | 0 | (5) | 0
Foreign Currency Translation |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance | (17) | (24) | (14) | (28)
Foreign currency translation adjustment | (1) | 12 | (5) | 16
Applicable income taxes | 0 | (3) | 1 | (3)
Ending Balance | $ (18) | $ (15) | $ (18) | $ (15)

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