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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)