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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Pre-tax AOCI activity, Period Start | $ (4,613) |  | $ (4,481) | $ (2,772) |  | $ 387 | $ (4,481) | $ 387
Other Comprehensive Income (Loss), before Tax | (1,068) |  |  | (2,099) |  |  | (1,200) | (5,258)
Pre-tax AOCI activity, Period End | (5,681) | $ (4,613) |  | (4,871) | $ (2,772) |  | (5,681) | (4,871)
Tax Effect, period start | 1,173 |  | 1,138 | 705 |  | (98) | 1,138 | (98)
Unrealized holding gains (losses) arising during the period on securities available for sale, Tax | 203 |  |  | 376 |  |  | 177 | 994
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax | 0 |  |  | 0 |  |  | 0 | 0
Other Comprehensive Income (Loss), Tax | 272 |  |  | 534 |  |  | 307 | 1,337
Tax Effect, period end | 1,445 | 1,173 |  | 1,239 | 705 |  | 1,445 | 1,239
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start | (3,440) |  | (3,343) | (2,067) |  | 289 | (3,343) | 289
Unrealized holding gains (losses) arising during the period on securities available for sale, net of tax | (595) |  |  | (1,102) |  |  | (518) | (2,913)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax | (274) |  |  | (471) |  |  | (496) | (891)
Reclassification adjustments for securities gains (losses) realized in net income (net of tax) | (1) |  |  | (1) |  |  | (3) | (1)
Net change in unrealized gains (losses) on derivative instruments, net of tax | (213) |  |  | (471) |  |  | (400) | (1,031)
Other comprehensive income (loss), net of tax | (796) | (596) | 499 | (1,565) | (853) | (1,503) | (893) | (3,921)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End | (4,236) | (3,440) |  | (3,632) | (2,067) |  | (4,236) | (3,632)
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 | (10) |  | (11) | (12) |  | (14) | (11) | (14)
Other Comprehensive Loss, Held-to-maturity Security, Reclassification Adjustment from AOCI for Noncredit Portion of OTTI, before Tax | 0 |  |  | 1 |  |  | 1 | 3
Pre-tax AOCI activity, Period End | (10) | (10) |  | (11) | (12) |  | (10) | (11)
Tax Effect, period start | 2 |  | 2 | 3 |  | 3 | 2 | 3
Reclassification adjustments for Amortization of Unrealized Losses on Securities Transferred to Held to Maturity, Tax | 0 |  |  | (1) |  |  | 0 | (1)
Tax Effect, period end | 2 | 2 |  | 2 | 3 |  | 2 | 2
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start | (8) |  | (9) | (9) |  | (11) | (9) | (11)
Reclassification adjustments for Amortization of Unrealized Losses on Securities Transferred to Held to Maturity (net of tax) | 0 |  |  | 0 |  |  | 1 | 2
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End | (8) | (8) |  | (9) | (9) |  | (8) | (9)
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 | (3,328) |  | (3,433) | (2,211) |  | 218 | (3,433) | 218
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax | (798) |  |  | (1,478) |  |  | (695) | (3,907)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax | 1 |  |  | 1 |  |  | 3 |
Other Comprehensive Income (Loss), before Tax | (797) |  |  | (1,477) |  |  | (692) | (3,906)
Pre-tax AOCI activity, Period End | (4,125) | (3,328) |  | (3,688) | (2,211) |  | (4,125) | (3,688)
Tax Effect, period start | 846 |  | 872 | 563 |  | (55) | 872 | (55)
Unrealized holding gains (losses) arising during the period on securities available for sale, Tax | 203 |  |  | 376 |  |  | 177 | (994)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax | 0 |  |  | 0 |  |  | 0 | 0
Other Comprehensive Income (Loss), Tax | 203 |  |  | 376 |  |  | 177 | 994
Tax Effect, period end | 1,049 | 846 |  | 939 | 563 |  | 1,049 | 939
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start | (2,482) |  | (2,561) | (1,648) |  | 163 | (2,561) | 163
Reclassification adjustments for securities gains (losses) realized in net income (net of tax) | 1 |  |  | 1 |  |  | 3 | 1
Other comprehensive income (loss), net of tax | (594) |  |  | (1,101) |  |  | (515) | (2,912)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End | (3,076) | (2,482) |  | (2,749) | (1,648) |  | (3,076) | (2,749)
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 | (719) |  | (468) | 82 |  | 830 | (468) | 830
OCI, before Reclassifications, before Tax, Attributable to Parent | (367) |  |  | (632) |  |  | (665) | (1,192)
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | (82) |  |  |  |  |  | (129) | 188
Other Comprehensive Income (Loss), before Tax | (285) |  |  |  |  |  | (536) | (1,380)
Pre-tax AOCI activity, Period End | (1,004) | (719) |  | (550) | 82 |  | (1,004) | (550)
Tax Effect, period start | 183 |  | 119 | (21) |  | (209) | 119 | (209)
OCI, before reclassifications, tax, attributable to parent | 93 |  |  | 161 |  |  | 169 | 301
Reclassification from AOCI, Current Period, Tax | (21) |  |  |  |  |  | (33) | 48
Other Comprehensive Income (Loss), Tax | 72 |  |  |  |  |  | 136 | 349
Tax Effect, period end | 255 | 183 |  | 140 | (21) |  | 255 | 140
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start | (536) |  | (349) | 61 |  | 621 | (349) | 621
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | 61 |  |  |  |  |  | 96 | 140
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  | (1,031)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End | (749) | (536) |  | (410) | 61 |  | (749) | (410)
Accumulated Defined Benefit Pension Plans Adjustment [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Pre-tax AOCI activity, Period Start | (556) |  | (569) | (631) |  | (647) | (569) | (647)
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income, before Tax | 14 |  |  | 9 |  |  | 27 | 25
Pre-tax AOCI activity, Period End | (542) | (556) |  | (622) | (631) |  | (542) | (622)
Tax Effect, period start | 142 |  | 145 | 160 |  | 163 | 145 | 163
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income, Tax | (3) |  |  | (2) |  |  | (6) | (5)
Tax Effect, period end | 139 | 142 |  | 158 | 160 |  | 139 | 158
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start | (414) |  | $ (424) | (471) |  | $ (484) | (424) | (484)
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income (net of tax) | 11 |  |  | 7 |  |  | 21 | 20
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End | $ (403) | $ (414) |  | $ (464) | $ (471) |  | $ (403) | $ (464)

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