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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