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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)