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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
Mar. 31, 2025
Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Pre-tax AOCI activity, Period Start $ (3,912) $ (3,773)
Tax Effect, period start 984 961
Beginning Balance 17,910  
OCIDebtSecuritiesAvailableForSaleTransferToHeldToMaturityUnrealizedGainLossBeforeAdjustmentBeforeTax (153)  
Unrealized losses on securities transferred to held to maturity during the period, tax (38) 0
Unrealized losses on securities transferred from available for sale during the period (115) 0
Reclassification adjustments for amortization on unrealized losses on securities transferred to held for maturity, tax 7 0
Reclassification adjustments for amortization on unrealized losses on securities transferred to held for maturity, after Tax (15) 0
Other Comprehensive Income (Loss), before Tax 850 (552)
Other Comprehensive Income (Loss), Tax (214) 140
Other comprehensive income (loss), net of tax 636 (412)
Stockholders Equity Other After Tax 9  
Stockholders Equity Other Tax 0  
Stockholders Equity Other Before Tax 9  
OCIDebtSecuritiesAvailableForSaleUnrealizedGainLossTransferredToHeldToMaturityBeforeAdjustmentTax (38) 0
Unrealized losses on securities transferred to held to maturity during the period 115 0
Unrealized holding gains (losses) on available for sale securities, tax 113 (81)
Unrealized holding gains (losses) arising during the period on securities available for sale, net of tax 345 (237)
Reclassification adjustments for securities gains (losses) realized in net income, tax 6 13
Reclassification adjustments for securities gains (losses) realized in net income (net of tax) (19) (37)
Unrealized holding gains (losses) on derivatives arising during the period 203 (303)
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income (net of tax) 4 4
Pre-tax AOCI activity, Period End (3,053) (4,325)
Ending Balance 18,567  
Tax Effect, period end 770 1,101
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (2,928) (2,812)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (2,283) (3,224)
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 (744) (9)
Tax Effect, period start 188 1
Beginning Balance (556) (8)
OCIDebtSecuritiesAvailableForSaleTransferToHeldToMaturityUnrealizedGainLossBeforeAdjustmentBeforeTax (153)  
Unrealized losses on securities transferred to held to maturity during the period, tax 38  
Unrealized losses on securities transferred from available for sale during the period (115)  
Reclassification adjustments for amortization on unrealized losses on securities transferred to held for maturity, before Tax 22 0
Reclassification adjustments for amortization on unrealized losses on securities transferred to held for maturity, tax (7) 0
Reclassification adjustments for amortization on unrealized losses on securities transferred to held for maturity, after Tax 15 0
Other Comprehensive Income (Loss), before Tax (131)  
Other Comprehensive Income (Loss), Tax 31  
Other comprehensive income (loss), net of tax (100)  
Pre-tax AOCI activity, Period End (875) (9)
Ending Balance (656) (8)
Tax Effect, period end 219 1
Unrealized gains (losses) on securities available for sale:    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Pre-tax AOCI activity, Period Start (1,958) (2,759)
Tax Effect, period start 490 703
Beginning Balance (1,468) (2,056)
Other Comprehensive Income (Loss), before Tax 636 (268)
Other Comprehensive Income (Loss), Tax (157) 68
Other comprehensive income (loss), net of tax 479 (200)
OCIDebtSecuritiesAvailableForSaleUnrealizedGainLossTransferredToHeldToMaturityArisingDuringBeforeTax 153  
OCIDebtSecuritiesAvailableForSaleUnrealizedGainLossTransferredToHeldToMaturityBeforeAdjustmentTax 38  
Unrealized losses on securities transferred to held to maturity during the period 115  
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax 458 (318)
Unrealized holding gains (losses) on available for sale securities, tax 113 81
Unrealized holding gains (losses) arising during the period on securities available for sale, net of tax 345  
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax 25 50
Reclassification adjustments for securities gains (losses) realized in net income, tax (6) (13)
Reclassification adjustments for securities gains (losses) realized in net income (net of tax) 19 37
Pre-tax AOCI activity, Period End (1,322) (3,027)
Ending Balance (989) (2,256)
Tax Effect, period end 333 771
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 (662) (399)
Tax Effect, period start 168 102
Beginning Balance (494) (297)
Other Comprehensive Income (Loss), before Tax 339 (290)
Other Comprehensive Income (Loss), Tax (86) 74
Other comprehensive income (loss), net of tax 253 (216)
OCI, before Reclassifications, before Tax, Attributable to Parent 272 (407)
OCI, before reclassifications, tax, attributable to parent (69) 104
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent (67) (117)
Reclassification from AOCI, Current Period, Tax 17 (30)
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent 50 87
Pre-tax AOCI activity, Period End (323) (689)
Ending Balance (241) (513)
Tax Effect, period end 82 176
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 (548) (606)
Tax Effect, period start 138 155
Beginning Balance (410) (451)
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income, before Tax (6) 6
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income, Tax 2 2
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income (net of tax) (4) 4
Pre-tax AOCI activity, Period End (542) (600)
Ending Balance (406) (447)
Tax Effect, period end $ 136 $ 153