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Accumulated Other Comprehensive Income - Activity in AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Pretax unrealized losses | $ 355 | $ 1,909 | $ 1,789 | $ 1,359
Other comprehensive income (loss), tax effect | (85) | (454) | (429) | (318)
Other comprehensive income (loss), net of tax | 270 | 1,455 | 1,360 | 1,041
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 21,124 | 19,226 | 19,645 | 19,172
Other comprehensive income, net of tax | 270 | 1,455 | 1,360 | 1,041
Ending balance | 21,107 | 20,784 | 21,107 | 20,784
Compensation and benefits | (685) | (690) | (2,132) | (2,099)
Accumulated Other Comprehensive Loss |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other comprehensive income (loss), net of tax | 270 | 1,455 | 1,360 | 1,041
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (3,546) | (4,901) | (4,636) | (4,487)
Other comprehensive income, net of tax | 270 | 1,455 | 1,360 | 1,041
Ending balance | (3,276) | (3,446) | (3,276) | (3,446)
Available-for-sale debt securities |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other comprehensive income (loss) before reclassifications, pre-tax activity | 305 | 1,241 | 1,175 | 1,001
Other comprehensive income (loss), before reclassifications, tax effect | (75) | (297) | (285) | (238)
Other comprehensive income (loss), before reclassifications, net activity | (230) | (944) | (890) | (763)
Reclassification adjustment, pre-tax activity | 0 | 11 | 0 | 17
Reclassification adjustment, tax effect | 0 | (2) | 0 | (4)
Reclassification adjustment, net activity | 0 | 9 | 0 | 13
Pretax unrealized losses | 305 | 1,252 | 1,175 | 2,012
Other comprehensive income (loss), tax effect | (75) | (299) | (285) | (451)
Other comprehensive income (loss), net of tax | 230 | 953 | 890 | 1,561
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (2,620) | (3,486) | (3,280) | (4,094)
Other comprehensive income, net of tax | 230 | 953 | 890 | 1,561
Ending balance | (2,390) | (2,533) | (2,390) | (2,533)
Available-for-sale debt securities transferred to held-to-maturity securities |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other comprehensive income (loss) before reclassifications, pre-tax activity |  |  |  | (994)
Other comprehensive income (loss), before reclassifications, tax effect |  |  |  | 209
Other comprehensive income (loss), before reclassifications, net activity |  |  |  | 785
Reclassification adjustment, pre-tax activity | 31 | 33 | 91 | 97
Reclassification adjustment, tax effect | (6) | (7) | (19) | (21)
Reclassification adjustment, net activity | 25 | 26 | 72 | 76
Pretax unrealized losses | 31 | 33 | 91 | (897)
Other comprehensive income (loss), tax effect | (6) | (7) | (19) | 188
Other comprehensive income (loss), net of tax | 25 | 26 | 72 | (709)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (637) | (735) | (684) | 0
Other comprehensive income, net of tax | 25 | 26 | 72 | (709)
Ending balance | (612) | (709) | (612) | (709)
Cash flow hedge derivatives |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other comprehensive income (loss) before reclassifications, pre-tax activity | (25) | 530 | 373 | (29)
Other comprehensive income (loss), before reclassifications, tax effect | 6 | (127) | (89) | 7
Other comprehensive income (loss), before reclassifications, net activity | 19 | (403) | (284) | 22
Reclassification adjustment, pre-tax activity | 43 | 91 | 149 | 270
Reclassification adjustment, tax effect | (10) | (21) | (36) | (62)
Reclassification adjustment, net activity | 33 | 70 | 113 | 208
Pretax unrealized losses | 18 | 621 | 522 | 241
Other comprehensive income (loss), tax effect | (4) | (148) | (125) | (55)
Other comprehensive income (loss), net of tax | 14 | 473 | 397 | 186
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (271) | (659) | (654) | (372)
Other comprehensive income, net of tax | 14 | 473 | 397 | 186
Ending balance | (257) | (186) | (257) | (186)
Net periodic benefit costs |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other comprehensive income (loss) before reclassifications, pre-tax activity | (1) |  | (1) |
Other comprehensive income (loss), before reclassifications, tax effect | 0 |  | 0 |
Other comprehensive income (loss), before reclassifications, net activity | 1 |  | 1 |
Reclassification adjustment, pre-tax activity | 2 | 1 | 2 | 1
Reclassification adjustment, tax effect | 0 | 0 | 0 | 0
Reclassification adjustment, net activity | 2 | 1 | 2 | 1
Pretax unrealized losses | 1 | 1 | 1 | 1
Other comprehensive income (loss), tax effect | 0 | 0 | 0 | 0
Other comprehensive income (loss), net of tax | 1 | 1 | 1 | 1
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (16) | (17) | (16) | (17)
Other comprehensive income, net of tax | 1 | 1 | 1 | 1
Ending balance | (15) | (16) | (15) | (16)
Other |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Pretax unrealized losses | 0 | 2 | 0 | 2
Other comprehensive income (loss), tax effect | 0 | 0 | 0 | 0
Other comprehensive income (loss), net of tax | 0 | 2 | 0 | 2
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (2) | (4) | (2) | (4)
Other comprehensive income, net of tax | 0 | 2 | 0 | 2
Ending balance | (2) | (2) | (2) | (2)
Settlements | Reclassification out of AOCI |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Compensation and benefits | $ (1) | $ 0 | $ (1) | $ 0

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