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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, 2023
Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Pre-tax AOCI activity, Period Start $ (4,481) $ 387
Other Comprehensive Income (Loss), before Tax 669 (2,016)
Pre-tax AOCI activity, Period End (3,812) (1,629)
Tax Effect, period start 1,138 (98)
Unrealized holding gains (losses) arising during the period on securities available for sale, Tax (114) 381
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax 0 0
Other Comprehensive Income (Loss), Tax (170) 513
Tax Effect, period end 968 415
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (3,343) 289
Unrealized holding gains (losses) arising during the period on securities available for sale, net of tax 333 (1,117)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax 148 (311)
Reclassification adjustments for securities gains (losses) realized in net income (net of tax) (2) 0
Net change in unrealized gains (losses) on derivative instruments, net of tax 159 (393)
Other comprehensive income (loss), net of tax 499 (1,503)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (2,844) (1,214)
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 (11) (14)
Other Comprehensive Loss, Held-to-maturity Security, Reclassification Adjustment from AOCI for Noncredit Portion of OTTI, before Tax 0 1
Pre-tax AOCI activity, Period End (11) (13)
Tax Effect, period start 2 3
Reclassification adjustments for Amortization of Unrealized Losses on Securities Transferred to Held to Maturity, Tax 0 0
Tax Effect, period end 2 3
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (9) (11)
Reclassification adjustments for Amortization of Unrealized Losses on Securities Transferred to Held to Maturity (net of tax) 0 1
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (9) (10)
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 (3,433) 218
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax 447 (1,498)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax 2  
Other Comprehensive Income (Loss), before Tax 449  
Pre-tax AOCI activity, Period End (2,984) (1,280)
Tax Effect, period start 872 (55)
Unrealized holding gains (losses) arising during the period on securities available for sale, Tax (114) (381)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax 0  
Other Comprehensive Income (Loss), Tax (114)  
Tax Effect, period end 758 326
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (2,561) 163
Reclassification adjustments for securities gains (losses) realized in net income (net of tax) 2  
Other comprehensive income (loss), net of tax 335  
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (2,226) (954)
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 (468) 830
OCI, before Reclassifications, before Tax, Attributable to Parent 198 (417)
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent (15) 110
Other Comprehensive Income (Loss), before Tax 213 (527)
Pre-tax AOCI activity, Period End (255) 303
Tax Effect, period start 119 (209)
OCI, before reclassifications, tax, attributable to parent (50) 106
Reclassification from AOCI, Current Period, Tax (4) 28
Other Comprehensive Income (Loss), Tax (54) 134
Tax Effect, period end 65 (75)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (349) 621
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent 11 82
Other comprehensive income (loss), net of tax   (393)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (190) 228
Accumulated Defined Benefit Pension Plans Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Pre-tax AOCI activity, Period Start (569) (647)
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income, before Tax 7 8
Pre-tax AOCI activity, Period End (562) (639)
Tax Effect, period start 145 163
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income, Tax (2) (2)
Tax Effect, period end 143 161
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (424) (484)
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income (net of tax) 5 6
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End $ (419) $ (478)