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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).

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(4)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(a)(3)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (h)(2) -URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(2)(ii) -URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e681-108580 + Details
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