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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, 2024
Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Pre-tax AOCI activity, Period Start $ (3,773) $ (4,481)
Other Comprehensive Income (Loss), before Tax (552) 669
Pre-tax AOCI activity, Period End (4,325) (3,812)
Tax Effect, period start 961 1,138
Unrealized holding gains (losses) arising during the period on securities available for sale, Tax 81 (114)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax 13 0
Other Comprehensive Income (Loss), Tax 140 (170)
Tax Effect, period end 1,101 968
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (2,812) (3,343)
Unrealized holding gains (losses) arising during the period on securities available for sale, net of tax (237) 333
Reclassification adjustments for securities gains (losses) realized in net income (net of tax) (37) (2)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax (303) 148
Net change in unrealized gains (losses) on derivative instruments, net of tax (216) 159
Other comprehensive income (loss), net of tax (412) 499
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (3,224) (2,844)
Accumulated Net Unrealized Loss on Held To Maturity Securities [Member]    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Pre-tax AOCI activity, Period Start (9) (11)
Other Comprehensive Loss, Held-to-maturity Security, Reclassification Adjustment from AOCI for Noncredit Portion of OTTI, before Tax 0 0
Pre-tax AOCI activity, Period End (9) (11)
Tax Effect, period start 1 2
Reclassification adjustments for Amortization of Unrealized Losses on Securities Transferred to Held to Maturity, Tax 0 0
Tax Effect, period end 1 2
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (8) (9)
Reclassification adjustments for Amortization of Unrealized Losses on Securities Transferred to Held to Maturity (net of tax) 0 0
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (8) (9)
Accumulated Net Unrealized Securities Available For Sale Gain (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Pre-tax AOCI activity, Period Start (2,759) (3,433)
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax (318) 447
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax 50 2
Other Comprehensive Income (Loss), before Tax (268) 449
Pre-tax AOCI activity, Period End (3,027) (2,984)
Tax Effect, period start 703 872
Unrealized holding gains (losses) arising during the period on securities available for sale, Tax 81 (114)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax (13) 0
Other Comprehensive Income (Loss), Tax 68 (114)
Tax Effect, period end 771 758
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (2,056) (2,561)
Reclassification adjustments for securities gains (losses) realized in net income (net of tax) 37 2
Other comprehensive income (loss), net of tax (200) 335
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (2,256) (2,226)
Accumulated Net Gain (Loss) from Derivative Instruments Designated as Cash Flow Hedges [Member]    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Pre-tax AOCI activity, Period Start (399) (468)
OCI, before Reclassifications, before Tax, Attributable to Parent (407) 198
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent (117) (15)
Other Comprehensive Income (Loss), before Tax (290) 213
Pre-tax AOCI activity, Period End (689) (255)
Tax Effect, period start 102 119
OCI, before reclassifications, tax, attributable to parent 104 (50)
Reclassification from AOCI, Current Period, Tax (30) (4)
Other Comprehensive Income (Loss), Tax 74 (54)
Tax Effect, period end 176 65
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (297) (349)
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent 87 11
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (513) (190)
Accumulated Defined Benefit Pension Plans Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Pre-tax AOCI activity, Period Start (606) (569)
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income, before Tax 6 7
Pre-tax AOCI activity, Period End (600) (562)
Tax Effect, period start 155 145
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income, Tax (2) (2)
Tax Effect, period end 153 143
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (451) (424)
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income (net of tax) 4 5
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End $ (447) $ (419)