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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
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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)

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