v3.25.2
Stockholders' Equity and Accumulated Other Comprehensive Income (Loss)(Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Pre-tax AOCI activity, Period Start $ (3,053) $ (3,912) $ (4,325) $ (3,773) $ (3,912) $ (3,773)    
Tax Effect, period start 770 984 1,101 961 984 961    
Unrealized losses on securities transferred to held to maturity during the period, tax (19)   0   (57) 0    
Unrealized losses on securities transferred from available for sale during the period (55)   0   (170) 0    
Reclassification adjustments for amortization on unrealized losses on securities transferred to held for maturity, tax 11   0   18 0    
Reclassification adjustments for amortization on unrealized losses on securities transferred to held for maturity, after Tax (32)   (1)   (47) (1)    
Other Comprehensive Income (Loss), before Tax 422   (54)   1,272 (606)    
Other Comprehensive Income (Loss), Tax (106)   13   (320) 153    
Other comprehensive income (loss), net of tax 316   (41)   952 (453)    
Stockholders Equity Other Before Tax         9      
Stockholders Equity Other Tax         0      
Stockholders Equity Other After Tax         9      
OCIDebtSecuritiesAvailableForSaleUnrealizedGainLossTransferredToHeldToMaturityBeforeAdjustmentTax (19)   0   (57) 0    
Unrealized losses on securities transferred to held to maturity during the period 55   0   170 0    
Unrealized holding gains (losses) on available for sale securities, tax 43   (24)   156 (105)    
Unrealized holding gains (losses) arising during the period on securities available for sale, net of tax 127   (73)   472 (310)    
Reclassification adjustments for securities gains (losses) realized in net income, tax 0   12   6 25    
Reclassification adjustments for securities gains (losses) realized in net income (net of tax) (1)   (38)   (20) (75)    
Unrealized holding gains (losses) on derivatives arising during the period 106   (97)   309 (400)    
Net change in unrealized gains (losses) on derivative instruments, net of tax 151   (11)   404 (227)    
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income (net of tax) 5   4   9 8    
Pre-tax AOCI activity, Period End (2,631) (3,053) (4,379) (4,325) (2,631) (4,379)    
Tax Effect, period end 664 770 1,114 1,101 664 1,114    
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (2,283) (2,928) (3,224) (2,812) (2,928) (2,812)    
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (1,967) (2,283) (3,265) (3,224) (1,967) (3,265)    
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 (875) (744) (9) (9) (744) (9)    
Tax Effect, period start 219 188 1 1 188 1    
OCIDebtSecuritiesAvailableForSaleTransferToHeldToMaturityUnrealizedGainLossBeforeAdjustmentBeforeTax (74)       (227)      
Unrealized losses on securities transferred to held to maturity during the period, tax 19       57      
Unrealized losses on securities transferred from available for sale during the period (55)       (170)      
Reclassification adjustments for amortization on unrealized losses on securities transferred to held for maturity, before Tax 43   1   65 1    
Reclassification adjustments for amortization on unrealized losses on securities transferred to held for maturity, tax (11)   0   (18) 0    
Reclassification adjustments for amortization on unrealized losses on securities transferred to held for maturity, after Tax 32   1   47 1    
Other Comprehensive Income (Loss), before Tax (31)       (162)      
Other Comprehensive Income (Loss), Tax 8       39      
Other comprehensive income (loss), net of tax (23)       (123)      
AOCI component, net of tax (679) (656) (7)   (679) (7) $ (556) $ (8)
Pre-tax AOCI activity, Period End (906) (875) (8) (9) (906) (8)    
Tax Effect, period end 227 219 1 1 227 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 (1,322) (1,958) (3,027) (2,759) (1,958) (2,759)    
Tax Effect, period start 333 490 771 703 490 703    
Other Comprehensive Income (Loss), before Tax 245   (47)   881 (315)    
Other Comprehensive Income (Loss), Tax (62)   12   (219) 80    
Other comprehensive income (loss), net of tax 183   (35)   662 (235)    
AOCI component, net of tax (806) (989) (2,291) (2,256) (806) (2,291) (1,468) (2,056)
OCIDebtSecuritiesAvailableForSaleUnrealizedGainLossTransferredToHeldToMaturityArisingDuringBeforeTax 74 153     227      
OCIDebtSecuritiesAvailableForSaleUnrealizedGainLossTransferredToHeldToMaturityBeforeAdjustmentTax 19       (57)      
Unrealized losses on securities transferred to held to maturity during the period 55       170      
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax 170   (97)   628 (415)    
Unrealized holding gains (losses) on available for sale securities, tax 43   24   156 105    
Unrealized holding gains (losses) arising during the period on securities available for sale, net of tax 127       472      
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax 1   50   26 100    
Reclassification adjustments for securities gains (losses) realized in net income, tax 0   (12)   (6) (25)    
Reclassification adjustments for securities gains (losses) realized in net income (net of tax) 1   38   20 75    
Pre-tax AOCI activity, Period End (1,077) (1,322) (3,074) (3,027) (1,077) (3,074)    
Tax Effect, period end 271 333 783 771 271 783    
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 (323) (662) (689) (399) (662) (399)    
Tax Effect, period start 82 168 176 102 168 102    
Other Comprehensive Income (Loss), before Tax 202   (14)   541 (304)    
Other Comprehensive Income (Loss), Tax (51)   3   (137) 77    
Other comprehensive income (loss), net of tax 151   (11)     (227)    
AOCI component, net of tax (90) (241) (524) (513) (90) (524) (494) (297)
OCI, before Reclassifications, before Tax, Attributable to Parent 142   (130)   414 (537)    
OCI, before reclassifications, tax, attributable to parent (36)   33   (105) 137    
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent (60)   (116)   (127) (233)    
Reclassification from AOCI, Current Period, Tax 15   (30)   (32) (60)    
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent 45   86   95 (173)    
Pre-tax AOCI activity, Period End (121) (323) (703) (689) (121) (703)    
Tax Effect, period end 31 82 179 176 31 179    
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 (542) (548) (600) (606) (548) (606)    
Tax Effect, period start 136 138 153 155 138 155    
AOCI component, net of tax (401) (406) (443) (447) (401) (443) $ (410) $ (451)
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income, before Tax (6)   6   12 12    
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income, Tax 1   2   3 4    
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income (net of tax) (5)   4   9 8    
Pre-tax AOCI activity, Period End (536) (542) (594) (600) (536) (594)    
Tax Effect, period end $ 135 $ 136 $ 151 $ 153 $ 135 $ 151