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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)