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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Pre-tax AOCI activity, Period Start $ (4,481) $ 387 $ 1,759
Other Comprehensive Income (Loss), before Tax 708 (4,868) (1,372)
Pre-tax AOCI activity, Period End (3,773) (4,481) 387
Tax Effect, period start 1,138 (98) (444)
Unrealized holding gains (losses) arising during the period on securities available for sale, Tax (168) 927 212
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax 1 0 (1)
Other Comprehensive Income (Loss), Tax (177) 1,236 346
Tax Effect, period end 961 1,138 (98)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (3,343) 289 1,315
Unrealized holding gains (losses) arising during the period on securities available for sale, net of tax 501 (2,725) (629)
Reclassification adjustments for securities gains (losses) realized in net income (net of tax) (4) (1) 2
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax 505 (2,724) (631)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax (124) (866) (265)
Net change in unrealized gains (losses) on derivative instruments, net of tax   (970) (583)
Other comprehensive income (loss), net of tax 531 (3,632) (1,026)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (2,812) (3,343) 289
Net actuarial gains (losses) arising during the period (net of tax) (61) 33 134
Net actuarial gains and losses arising during the period, tax (21) 7 46
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) (21)
Other Comprehensive Loss, Held-to-maturity Security, Reclassification Adjustment from AOCI for Noncredit Portion of OTTI, before Tax 2 3 7
Pre-tax AOCI activity, Period End (9) (11) (14)
Tax Effect, period start 2 3 5
Reclassification adjustments for Amortization of Unrealized Losses on Securities Transferred to Held to Maturity, Tax (1) (1) (2)
Tax Effect, period end 1 2 3
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (9) (11) (16)
Reclassification adjustments for Amortization of Unrealized Losses on Securities Transferred to Held to Maturity (net of tax) 1 2 5
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (8) (9) (11)
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 1,062
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax 669 (3,652) (841)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax 5 1 (3)
Other Comprehensive Income (Loss), before Tax 674 (3,651) (844)
Pre-tax AOCI activity, Period End (2,759) (3,433) 218
Tax Effect, period start 872 (55) (268)
Unrealized holding gains (losses) arising during the period on securities available for sale, Tax (168) (927) (212)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax (1) 0 1
Other Comprehensive Income (Loss), Tax (169) 927 213
Tax Effect, period end 703 872 (55)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (2,561) 163 794
Reclassification adjustments for securities gains (losses) realized in net income (net of tax) 4 1 (2)
Other comprehensive income (loss), net of tax 505 (2,724)  
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (2,056) (2,561) 163
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 1,610
OCI, before Reclassifications, before Tax, Attributable to Parent (167) (1,158) (354)
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent (236) 140 426
Other Comprehensive Income (Loss), before Tax 69 (1,298) (780)
Pre-tax AOCI activity, Period End (399) (468) 830
Tax Effect, period start 119 (209) (406)
OCI, before reclassifications, tax, attributable to parent 43 292 89
Reclassification from AOCI, Current Period, Tax (60) 36 (108)
Other Comprehensive Income (Loss), Tax (17) 328 197
Tax Effect, period end 102 119 (209)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (349) 621 1,204
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent 176 104 318
Other comprehensive income (loss), net of tax 52 (970) (583)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (297) (349) 621
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) (892)
Net actuarial gains (losses) arising during the period, before tax (82) 40 180
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income, before Tax 45 38 65
Other Comprehensive Income (Loss), before Tax (37) 78 245
Pre-tax AOCI activity, Period End (606) (569) (647)
Tax Effect, period start 145 163 225
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income, Tax (11) (11) (16)
Other Comprehensive Income (Loss), Tax 10 (18) (62)
Tax Effect, period end 155 145 163
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (424) (484) (667)
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income (net of tax) 34 27 49
Other comprehensive income (loss), net of tax (27) 60 183
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (451) (424) (484)
Net actuarial gains and losses arising during the period, tax $ 21 $ (7) $ (46)