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Shareholders' Equity and Accumulated Other Comprehensive Income (Loss) (Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |
Pre-tax AOCI activity, Period Start | $ (2,631) |  | $ (3,912) | $ (4,379) |  | $ (3,912) | $ (3,773) |  |
Tax Effect, period start | 664 |  | 984 | 1,114 |  | 984 | 961 |  |
Unrealized losses on securities transferred to held to maturity during the period, tax | 0 |  |  | (111) |  | (57) | (111) |  |
Unrealized losses on securities transferred from available for sale during the period | 0 |  |  | (325) |  | (170) | (325) |  |
Reclassification adjustments for amortization on unrealized losses on securities transferred to held for maturity, tax | 4 |  |  | 0 |  | 22 | 0 |  |
Reclassification adjustments for amortization on unrealized losses on securities transferred to held for maturity, after Tax | (9) |  |  | (1) |  | (56) | (2) |  |
Other Comprehensive Income (Loss), before Tax | 411 |  |  | 1,839 |  | 1,683 | 1,233 |  |
Other Comprehensive Income (Loss), Tax | (104) |  |  | (468) |  | (424) | (315) |  |
Other comprehensive income, net of tax | 307 | $ 316 |  | 1,371 | $ (41) | 1,259 | 918 |  |
Stockholders Equity Other Before Tax |  |  |  |  |  | 9 |  |  |
Stockholders Equity Other Tax |  |  |  |  |  | 0 |  |  |
Stockholders Equity Other After Tax |  |  |  |  |  | 9 |  |  |
OCIDebtSecuritiesAvailableForSaleUnrealizedGainLossTransferredToHeldToMaturityBeforeAdjustmentTax | 0 |  |  | (111) |  | (57) | (111) |  |
Unrealized losses on securities transferred to held to maturity during the period | 0 |  |  | 325 |  | 170 | 325 |  |
Unrealized holding gains (losses) on available for sale securities, tax | (72) |  |  | (298) |  | (228) | (193) |  |
Unrealized holding gains (losses) arising during the period on securities available for sale, net of tax | 215 |  |  | 870 |  | 687 | 560 |  |
Reclassification adjustments for securities gains (losses) realized in net income, tax | 7 |  |  | 20 |  | 13 | 45 |  |
Reclassification adjustments for securities gains (losses) realized in net income (net of tax) | (20) |  |  | (58) |  | (40) | (133) |  |
Unrealized holding gains (losses) on derivatives arising during the period | 9 |  |  | 354 |  | 318 | (46) |  |
Net change in unrealized gains (losses) on derivative instruments, net of tax | 58 |  |  | 436 |  | 462 | 209 |  |
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income (net of tax) | 5 |  |  | 6 |  | 14 | 14 |  |
Pre-tax AOCI activity, Period End | (2,220) | (2,631) |  | (2,540) | (4,379) | (2,220) | (2,540) |  |
Tax Effect, period end | 560 | 664 |  | 646 | 1,114 | 560 | 646 |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start | (1,967) |  | (2,928) | (3,265) |  | (2,928) | (2,812) |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End | (1,660) | (1,967) |  | (1,894) | (3,265) | (1,660) | (1,894) |  |
Unrealized losses on securities transferred to held to maturity: |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |
Pre-tax AOCI activity, Period Start | (906) |  | (744) | (8) |  | (744) | (9) |  |
Tax Effect, period start | 227 |  | 188 | 1 |  | 188 | 1 |  |
OCIDebtSecuritiesAvailableForSaleTransferToHeldToMaturityUnrealizedGainLossBeforeAdjustmentBeforeTax |  |  |  | (436) |  | (227) | (436) |  |
Unrealized losses on securities transferred to held to maturity during the period, tax |  |  |  | 111 |  | 57 | 111 |  |
Unrealized losses on securities transferred from available for sale during the period |  |  |  | (325) |  | (170) | (325) |  |
Reclassification adjustments for amortization on unrealized losses on securities transferred to held for maturity, before Tax | 13 |  |  | 1 |  | 78 | 2 |  |
Reclassification adjustments for amortization on unrealized losses on securities transferred to held for maturity, tax | (4) |  |  | 0 |  | (22) | 0 |  |
Reclassification adjustments for amortization on unrealized losses on securities transferred to held for maturity, after Tax | 9 |  |  | 1 |  | 56 | 2 |  |
Other Comprehensive Income (Loss), before Tax |  |  |  | (435) |  | (149) | (434) |  |
Other Comprehensive Income (Loss), Tax |  |  |  | 111 |  | 35 | 111 |  |
Other comprehensive income, net of tax |  |  |  | (324) |  | (114) | (323) |  |
AOCI component, net of tax | (670) | (679) |  | (331) | (7) | (670) | (331) | $ (556) | $ (8)
Pre-tax AOCI activity, Period End | (893) | (906) |  | (443) | (8) | (893) | (443) |  |
Tax Effect, period end | 223 | 227 |  | 112 | 1 | 223 | 112 |  |
Unrealized gains (losses) on securities available for sale: |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |
Pre-tax AOCI activity, Period Start | (1,077) |  | (1,958) | (3,074) |  | (1,958) | (2,759) |  |
Tax Effect, period start | 271 |  | 490 | 783 |  | 490 | 703 |  |
Other Comprehensive Income (Loss), before Tax | 314 |  |  | 1,682 |  | 1,195 | 1,367 |  |
Other Comprehensive Income (Loss), Tax | (79) |  |  | (429) |  | (298) | (349) |  |
Other comprehensive income, net of tax | 235 |  |  | 1,253 |  | 897 | 1,018 |  |
AOCI component, net of tax | (571) | (806) |  | (1,038) | (2,291) | (571) | (1,038) | (1,468) | (2,056)
OCIDebtSecuritiesAvailableForSaleUnrealizedGainLossTransferredToHeldToMaturityArisingDuringBeforeTax |  | 74 | 153 | 436 |  | 227 | 436 |  |
OCIDebtSecuritiesAvailableForSaleUnrealizedGainLossTransferredToHeldToMaturityBeforeAdjustmentTax |  |  |  | 111 |  | 57 | 111 |  |
Unrealized losses on securities transferred to held to maturity during the period |  |  |  | 325 |  | 170 | 325 |  |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax | 287 |  |  | 1,168 |  | 915 | 753 |  |
Unrealized holding gains (losses) on available for sale securities, tax | (72) |  |  | (298) |  | (228) | (193) |  |
Unrealized holding gains (losses) arising during the period on securities available for sale, net of tax | 215 |  |  | 870 |  | 687 | 560 |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax | 27 |  |  | 78 |  | 53 | 178 |  |
Reclassification adjustments for securities gains (losses) realized in net income, tax | (7) |  |  | (20) |  | (13) | (45) |  |
Reclassification adjustments for securities gains (losses) realized in net income (net of tax) | 20 |  |  | 58 |  | 40 | 133 |  |
Pre-tax AOCI activity, Period End | (763) | (1,077) |  | (1,392) | (3,074) | (763) | (1,392) |  |
Tax Effect, period end | 192 | 271 |  | 354 | 783 | 192 | 354 |  |
Unrealized gains (losses) on derivative instruments designated as cash flow hedges: |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |
Pre-tax AOCI activity, Period Start | (121) |  | (662) | (703) |  | (662) | (399) |  |
Tax Effect, period start | 31 |  | 168 | 179 |  | 168 | 102 |  |
Other Comprehensive Income (Loss), before Tax | 78 |  |  | 585 |  | 619 | 281 |  |
Other Comprehensive Income (Loss), Tax | (20) |  |  | (149) |  | (157) | (72) |  |
Other comprehensive income, net of tax | 58 |  |  | 436 |  |  | 209 |  |
AOCI component, net of tax | (32) | (90) |  | (88) | (524) | (32) | (88) | (494) | (297)
OCI, before Reclassifications, before Tax, Attributable to Parent | 13 |  |  | 475 |  | 427 | (62) |  |
OCI, before reclassifications, tax, attributable to parent | (4) |  |  | (121) |  | (109) | 16 |  |
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | (65) |  |  | (110) |  | (192) | (343) |  |
Reclassification from AOCI, Current Period, Tax | 16 |  |  | (28) |  | (48) | (88) |  |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | 49 |  |  | 82 |  | 144 | (255) |  |
Pre-tax AOCI activity, Period End | (43) | (121) |  | (118) | (703) | (43) | (118) |  |
Tax Effect, period end | 11 | 31 |  | 30 | 179 | 11 | 30 |  |
Defined benefit pension plans and other post employment benefit plans: |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |
Pre-tax AOCI activity, Period Start | (536) |  | (548) | (594) |  | (548) | (606) |  |
Tax Effect, period start | 135 |  | $ 138 | 151 |  | 138 | 155 |  |
AOCI component, net of tax | (396) | (401) |  | (437) | (443) | (396) | (437) | $ (410) | $ (451)
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income, before Tax | (6) |  |  | 7 |  | 18 | 19 |  |
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income, Tax | 1 |  |  | 1 |  | 4 | 5 |  |
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income (net of tax) | (5) |  |  | 6 |  | 14 | 14 |  |
Pre-tax AOCI activity, Period End | (530) | (536) |  | (587) | (594) | (530) | (587) |  |
Tax Effect, period end | $ 134 | $ 135 |  | $ 150 | $ 151 | $ 134 | $ 150 |  |

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