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Stockholders' Equity and Accumulated Other Comprehensive Income (Loss)(Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Pre-tax AOCI activity, Period Start |  |  | $ (3,773) | $ (4,481) | $ 387
OCIDebtSecuritiesAvailableForSaleTransferToHeldToMaturityUnrealizedGainLossBeforeAdjustmentBeforeTax | $ (318) | $ (436) |  |  |
Unrealized losses on securities transferred to held to maturity during the period, tax |  |  | (192) | 0 | 0
Unrealized losses on securities transferred from available for sale during the period |  |  | (562) | 0 | 0
Amortization of unrealized losses on securities transferred to held to maturity, tax |  |  | (5) | (1) | (1)
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), after Tax |  |  | (14) | (1) | (2)
Other Comprehensive Income (Loss), before Tax |  |  | (139) | 708 | (4,868)
Other Comprehensive Income (Loss), Tax |  |  | 23 | (177) | 1,236
Other comprehensive income (loss), net of tax |  |  | (116) | 531 | (3,632)
OCIDebtSecuritiesAvailableForSaleUnrealizedGainLossTransferredToHeldToMaturityBeforeAdjustmentTax |  |  | (192) | 0 |
Unrealized losses on securities transferred to held to maturity during the period |  |  | 562 | 0 | 0
Unrealized holding gains (losses) on available for sale securities, tax |  |  | (31) | 168 | (927)
Unrealized holding gains (losses) arising during the period on securities available for sale, net of tax |  |  | (130) | 501 | (2,725)
Reclassification adjustments for securities gains (losses) realized in net income, tax |  |  |  | 1 | 0
Reclassification adjustments for securities gains (losses) realized in net income (net of tax) |  |  | (156) | (4) | (1)
Pre-tax AOCI activity, Period End | (3,912) |  | (3,912) | (3,773) | (4,481)
Unrealized holding gains (losses) on derivatives arising during the period |  |  | (511) | (124) | (866)
Net actuarial gains and losses arising during the period, tax |  |  | 9 | (21) | 7
Net actuarial gains (losses) arising during the period (net of tax) |  |  | (18) | 61 | (33)
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income (net of tax) |  |  | 23 | 34 | 27
Tax Effect, period start |  |  | 961 | 1,138 | (98)
Tax Effect, period end | 984 |  | 984 | 961 | 1,138
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start |  |  | (2,812) | (3,343) | 289
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End | (2,928) |  | (2,928) | (2,812) | (3,343)
Net change in unrealized gains (losses) on derivative instruments, net of tax |  |  | (197) | 52 | (970)
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 |  |  | (9) | (11) | (14)
OCIDebtSecuritiesAvailableForSaleTransferToHeldToMaturityUnrealizedGainLossBeforeAdjustmentBeforeTax |  |  | 754 |  |
Unrealized losses on securities transferred to held to maturity during the period, tax |  |  | 192 |  |
Unrealized losses on securities transferred from available for sale during the period |  |  | (562) |  |
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), before Tax |  |  | 19 | 2 | 3
Amortization of unrealized losses on securities transferred to held to maturity, tax |  |  | 5 | 1 | 1
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), after Tax |  |  | 14 | 1 | 2
Other Comprehensive Income (Loss), before Tax |  |  | (735) |  |
Other Comprehensive Income (Loss), Tax |  |  | 187 |  |
Other comprehensive income (loss), net of tax |  |  | (548) |  |
Pre-tax AOCI activity, Period End | (744) |  | (744) | (9) | (11)
Tax Effect, period start |  |  | 1 | 2 | 3
Tax Effect, period end | 188 |  | 188 | 1 | 2
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start |  |  | (8) | (9) | (11)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End | (556) |  | (556) | (8) | (9)
Unrealized gains (losses) on securities available for sale: |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Pre-tax AOCI activity, Period Start |  |  | (2,759) | (3,433) | 218
Other Comprehensive Income (Loss), before Tax |  |  | 801 | 674 | (3,651)
Other Comprehensive Income (Loss), Tax |  |  | (213) | (169) | 927
Other comprehensive income (loss), net of tax |  |  | 588 | 505 | (2,724)
OCIDebtSecuritiesAvailableForSaleUnrealizedGainLossTransferredToHeldToMaturityArisingDuringBeforeTax |  |  | 754 |  |
OCIDebtSecuritiesAvailableForSaleUnrealizedGainLossTransferredToHeldToMaturityBeforeAdjustmentTax |  |  | (192) |  |
Unrealized losses on securities transferred to held to maturity during the period |  |  | 562 |  |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax |  |  | (161) | 669 | (3,652)
Unrealized holding gains (losses) on available for sale securities, tax |  |  | (31) | (168) | 927
Unrealized holding gains (losses) arising during the period on securities available for sale, net of tax |  |  | (130) |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax |  |  | 208 | 5 | (1)
Reclassification adjustments for securities gains (losses) realized in net income, tax |  |  | (52) | (1) | 0
Reclassification adjustments for securities gains (losses) realized in net income (net of tax) |  |  | 156 | 4 | 1
Pre-tax AOCI activity, Period End | (1,958) |  | (1,958) | (2,759) | (3,433)
Tax Effect, period start |  |  | 703 | 872 | (55)
Tax Effect, period end | 490 |  | 490 | 703 | 872
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start |  |  | (2,056) | (2,561) | 163
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End | (1,468) |  | (1,468) | (2,056) | (2,561)
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 |  |  | (399) | (468) | 830
Other Comprehensive Income (Loss), before Tax |  |  | (263) | 69 | (1,298)
Other Comprehensive Income (Loss), Tax |  |  | 66 | (17) | 328
Other comprehensive income (loss), net of tax |  |  |  | 52 | (970)
Pre-tax AOCI activity, Period End | (662) |  | (662) | (399) | (468)
OCI, before Reclassifications, before Tax, Attributable to Parent |  |  | (683) | (167) | (1,158)
OCI, before reclassifications, tax, attributable to parent |  |  | 172 | 43 | 292
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent |  |  | (420) | (236) | 140
Reclassification from AOCI, Current Period, Tax |  |  | (106) | (60) | (36)
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent |  |  | 314 | (176) | 104
Tax Effect, period start |  |  | 102 | 119 | (209)
Tax Effect, period end | 168 |  | 168 | 102 | 119
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start |  |  | (297) | (349) | 621
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End | (494) |  | (494) | (297) | (349)
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 |  |  | (606) | (569) | (647)
Other Comprehensive Income (Loss), before Tax |  |  | 58 | (37) | 78
Other Comprehensive Income (Loss), Tax |  |  | (17) | 10 | (18)
Other comprehensive income (loss), net of tax |  |  | 41 | (27) | 60
Pre-tax AOCI activity, Period End | (548) |  | (548) | (606) | (569)
Net actuarial gains (losses) arising during the period, before tax |  |  | 27 | (82) | 40
Net actuarial gains and losses arising during the period, tax |  |  | (9) | 21 | (7)
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income, before Tax |  |  | 31 | 45 | 38
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income, Tax |  |  | 8 | 11 | (11)
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income (net of tax) |  |  | 23 | 34 | 27
Tax Effect, period start |  |  | 155 | 145 | 163
Tax Effect, period end | 138 |  | 138 | 155 | 145
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start |  |  | (451) | (424) | (484)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End | $ (410) |  | $ (410) | $ (451) | $ (424)

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