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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Pre-tax AOCI activity, Period Start | $ (4,325) | $ (3,773) | $ (3,812) | $ (4,481) | $ (3,773) | $ (4,481)
Other Comprehensive Income (Loss), before Tax | (54) |  | (801) |  | (606) | (132)
Pre-tax AOCI activity, Period End | (4,379) | (4,325) | (4,613) | (3,812) | (4,379) | (4,613)
Tax Effect, period start | 1,101 | 961 | 968 | 1,138 | 961 | 1,138
Unrealized holding gains (losses) arising during the period on securities available for sale, Tax | 24 |  | 88 |  | 105 | (26)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax | 12 |  | 0 |  | 25 | 0
Other Comprehensive Income (Loss), Tax | 13 |  | 205 |  | 153 | 35
Tax Effect, period end | 1,114 | 1,101 | 1,173 | 968 | 1,114 | 1,173
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start | (3,224) | (2,812) | (2,844) | (3,343) | (2,812) | (3,343)
Unrealized holding gains (losses) arising during the period on securities available for sale, net of tax | (73) |  | (256) |  | (310) | 77
Reclassification adjustments for securities gains (losses) realized in net income (net of tax) | (38) |  | 0 |  | (75) | (2)
Unrealized holding gains (losses) on derivatives arising during the period | (97) |  | (370) |  | (400) | (222)
Other comprehensive income (loss), net of tax | (41) | (412) | (596) | 499 | (453) | (97)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End | (3,265) | (3,224) | (3,440) | (2,844) | (3,265) | (3,440)
Unrealized losses on securities transferred to held to maturity: |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Pre-tax AOCI activity, Period Start | (9) | (9) | (11) | (11) | (9) | (11)
Other Comprehensive Loss, Held-to-maturity Security, Reclassification Adjustment from AOCI for Noncredit Portion of OTTI, before Tax | 1 |  | 1 |  | 1 | 1
Pre-tax AOCI activity, Period End | (8) | (9) | (10) | (11) | (8) | (10)
Tax Effect, period start | 1 | 1 | 2 | 2 | 1 | 2
Reclassification adjustments for Amortization of Unrealized Losses on Securities Transferred to Held to Maturity, Tax | 0 |  | 0 |  | 0 | 0
Tax Effect, period end | 1 | 1 | 2 | 2 | 1 | 2
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start | (8) | (8) | (9) | (9) | (8) | (9)
Reclassification adjustments for Amortization of Unrealized Losses on Securities Transferred to Held to Maturity (net of tax) | 1 |  | 1 |  | 1 | 1
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End | (7) | (8) | (8) | (9) | (7) | (8)
Unrealized gains (losses) on securities available for sale: |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Pre-tax AOCI activity, Period Start | (3,027) | (2,759) | (2,984) | (3,433) | (2,759) | (3,433)
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax | (97) |  | (344) |  | (415) | 103
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax | 50 |  |  |  | 100 | 2
Other Comprehensive Income (Loss), before Tax | (47) |  |  |  | (315) | 105
Pre-tax AOCI activity, Period End | (3,074) | (3,027) | (3,328) | (2,984) | (3,074) | (3,328)
Tax Effect, period start | 771 | 703 | 758 | 872 | 703 | 872
Unrealized holding gains (losses) arising during the period on securities available for sale, Tax | 24 |  |  |  | 105 | 26
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax | (12) |  |  |  | (25) | 0
Other Comprehensive Income (Loss), Tax | 12 |  | 88 |  | 80 | (26)
Tax Effect, period end | 783 | 771 | 846 | 758 | 783 | 846
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start | (2,256) | (2,056) | (2,226) | (2,561) | (2,056) | (2,561)
Reclassification adjustments for securities gains (losses) realized in net income (net of tax) | 38 |  |  |  | 75 | 2
Other comprehensive income (loss), net of tax | (35) |  |  |  | (235) | 79
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End | (2,291) | (2,256) | (2,482) | (2,226) | (2,291) | (2,482)
Unrealized gains (losses) on derivative instruments designated as cash flow hedges: |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Pre-tax AOCI activity, Period Start | (689) | (399) | (255) | (468) | (399) | (468)
OCI, before Reclassifications, before Tax, Attributable to Parent | (130) |  | (496) |  | (537) | (298)
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | (116) |  | (32) |  | (233) | (47)
Other Comprehensive Income (Loss), before Tax | (14) |  | (464) |  | (304) | (251)
Pre-tax AOCI activity, Period End | (703) | (689) | (719) | (255) | (703) | (719)
Tax Effect, period start | 176 | 102 | 65 | 119 | 102 | 119
OCI, before reclassifications, tax, attributable to parent | 33 |  | 126 |  | 137 | 76
Reclassification from AOCI, Current Period, Tax | (30) |  | (8) |  | (60) | (12)
Other Comprehensive Income (Loss), Tax | 3 |  | 118 |  | 77 | 64
Tax Effect, period end | 179 | 176 | 183 | 65 | 179 | 183
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start | (513) | (297) | (190) | (349) | (297) | (349)
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | 86 |  | 24 |  | 173 | (35)
Other comprehensive income (loss), net of tax | (11) |  | (346) |  | (227) | (187)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End | (524) | (513) | (536) | (190) | (524) | (536)
Defined benefit pension plans and other post employment benefit plans: |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Pre-tax AOCI activity, Period Start | (600) | (606) | (562) | (569) | (606) | (569)
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income, before Tax | 6 |  | 6 |  | 12 | 13
Pre-tax AOCI activity, Period End | (594) | (600) | (556) | (562) | (594) | (556)
Tax Effect, period start | 153 | 155 | 143 | 145 | 155 | 145
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income, Tax | (2) |  | (1) |  | (4) | (3)
Tax Effect, period end | 151 | 153 | 142 | 143 | 151 | 142
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start | (447) | (451) | (419) | (424) | (451) | (424)
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income (net of tax) | 4 |  | 5 |  | 8 | 10
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End | $ (443) | $ (447) | $ (414) | $ (419) | $ (443) | $ (414)

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