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Accumulated Other Comprehensive Income - Schedule of Changes in AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | $ 19,987 | $ 19,003 | $ 20,381 | $ 18,176
Other comprehensive income before reclassification, net of income taxes | (155) | 215 | (446) | 828
Amounts reclassified from AOCI, net of income taxes | 22 | 71 | 52 | 141
Total other comprehensive income (loss), net of tax | (133) | 286 | (394) | 969
Ending balance | 19,798 | 19,484 | 19,798 | 19,484
Accumulated Other Comprehensive Income (Loss) |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (2,221) | (2,787) | (1,960) | (3,470)
Ending balance | (2,354) | (2,501) | (2,354) | (2,501)
Unrealized gains (losses) on securities available for sale |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (1,888) | (2,310) | (1,716) | (2,734)
Other comprehensive income before reclassification, net of income taxes | (51) | 152 | (223) | 576
Amounts reclassified from AOCI, net of income taxes | 0 | 0 | 0 | 0
Total other comprehensive income (loss), net of tax | (51) | 152 | (223) | 576
Ending balance | (1,939) | (2,158) | (1,939) | (2,158)
Unrealized gains (losses) on derivative financial instruments |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (98) | (241) | (7) | (434)
Other comprehensive income before reclassification, net of income taxes | (103) | 64 | (223) | 186
Amounts reclassified from AOCI, net of income taxes | 20 | 69 | 49 | 140
Total other comprehensive income (loss), net of tax | (83) | 133 | (174) | 326
Ending balance | (181) | (108) | (181) | (108)
Net pension and postretirement benefit costs |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (235) | (236) | (237) | (302)
Other comprehensive income before reclassification, net of income taxes | (1) | (1) | 0 | 66
Amounts reclassified from AOCI, net of income taxes | 2 | 2 | 3 | 1
Total other comprehensive income (loss), net of tax | 1 | 1 | 3 | 67
Ending balance | $ (234) | $ (235) | $ (234) | $ (235)

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