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Stockholders' Equity and Accumulated Other Comprehensive Income (Loss)(Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Pre-tax AOCI activity, Period Start $ 387 $ 1,759 $ (120)
Other Comprehensive Income (Loss), before Tax (4,868) (1,372) 1,879
Pre-tax AOCI activity, Period End (4,481) 387 1,759
Tax Effect, period start [1] (98) (444) 30
Unrealized holding gains (losses) arising during the period on securities available for sale, Tax 927 212 (200)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax 0 (1) (1)
Net actuarial gains and losses arising during the period, tax 7 46 (36)
Other Comprehensive Income (Loss), Tax [1] 1,236 346 (474)
Tax Effect, period end 1,138 (98) [1] (444) [1]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start 289 1,315 (90)
Unrealized holding gains (losses) arising during the period on securities available for sale, net of tax (2,725) (629) 592
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax (2,724) (631) 589
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax (866) (265) 1,077
Reclassification adjustments for securities gains (losses) realized in net income (net of tax) (1) 2 3
Net change in unrealized gains (losses) on derivative instruments, net of tax (970) (583) 882
Net actuarial gains (losses) arising during the period (net of tax) (33) (134) 108
Other comprehensive income (loss), net of tax (3,632) (1,026) 1,405
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (3,343) 289 1,315
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 (14) (21) (29)
Other Comprehensive Loss, Held-to-maturity Security, Reclassification Adjustment from AOCI for Noncredit Portion of OTTI, before Tax [2] 3 7 8
Pre-tax AOCI activity, Period End (11) (14) (21)
Tax Effect, period start [1] 3 5 7
Reclassification adjustments for Amortization of Unrealized Losses on Securities Transferred to Held to Maturity, Tax [1],[2] (1) (2) (2)
Tax Effect, period end [1] 2 3 5
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (11) (16) (22)
Reclassification adjustments for Amortization of Unrealized Losses on Securities Transferred to Held to Maturity (net of tax) [2] 2 5 6
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (9) (11) (16)
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 218 1,062 274
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax (3,652) (841) 792
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax 1 [3] (3) [3] (4)
Other Comprehensive Income (Loss), before Tax (3,651) (844) 788
Pre-tax AOCI activity, Period End (3,433) 218 1,062
Tax Effect, period start [1] (55) (268) (69)
Unrealized holding gains (losses) arising during the period on securities available for sale, Tax [1] (927) (212) 200
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax 0 [1],[3] 1 [1],[3] 1
Other Comprehensive Income (Loss), Tax 927 [1] 213 [1] (199)
Tax Effect, period end [1] 872 (55) (268)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start 163 794 205
Reclassification adjustments for securities gains (losses) realized in net income (net of tax) 1 [3] (2) [3] (3)
Other comprehensive income (loss), net of tax (2,724) (631)  
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (2,561) 163 794
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 830 1,610 430
OCI, before Reclassifications, before Tax, Attributable to Parent (1,158) (354) 1,440
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent [2] 140 426 260
Other Comprehensive Income (Loss), before Tax (1,298) (780) 1,180
Pre-tax AOCI activity, Period End (468) 830 1,610
Tax Effect, period start [1] (209) (406) (108)
OCI, before reclassifications, tax, attributable to parent [1] 292 89 (363)
Reclassification from AOCI, Current Period, Tax [1],[2] (36) (108) (65)
Other Comprehensive Income (Loss), Tax [1] 328 197 (298)
Tax Effect, period end [1] 119 (209) (406)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start 621 1,204 322
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent [2] 104 318 195
Other comprehensive income (loss), net of tax   (583) 882
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (349) 621 1,204
Accumulated Defined Benefit Pension Plans Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Pre-tax AOCI activity, Period Start (647) (892) (795)
Net actuarial gains (losses) arising during the period, before tax 40 180 (144)
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income, before Tax [4] 38 65 47
Other Comprehensive Income (Loss), before Tax 78 245 (97)
Pre-tax AOCI activity, Period End (569) (647) (892)
Tax Effect, period start [1] 163 225 200
Net actuarial gains and losses arising during the period, tax [1] (7) (46) 36
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income, Tax [1],[4] (11) (16) (11)
Other Comprehensive Income (Loss), Tax [1] (18) (62) 25
Tax Effect, period end [1] 145 163 225
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (484) (667) (595)
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income (net of tax) [4] 27 49 36
Other comprehensive income (loss), net of tax 60 183 (72)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End $ (424) $ (484) $ (667)
[1] The impact of all AOCI activity is shown net of the related tax impact, calculated using an effective tax rate of approximately 25%.
[2] Reclassification amount is recognized in net interest income in the consolidated statements of income.
[3] Reclassification amount is recognized in securities gains (losses), net in the consolidated statements of income.
[4] Reclassification amount is recognized in other non-interest expense in the consolidated statements of income. Additionally, these accumulated other comprehensive income (loss) components are included in the computation of net periodic pension cost (see Note 17 for additional details).