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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, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Pre-tax AOCI activity, Period Start $ (3,812) $ (4,481) $ (1,629) $ 387 $ (4,481) $ 387
Other Comprehensive Income (Loss), before Tax (801)   (1,143)   (132) (3,159)
Pre-tax AOCI activity, Period End (4,613) (3,812) (2,772) (1,629) (4,613) (2,772)
Tax Effect, period start 968 1,138 415 (98) 1,138 (98)
Unrealized holding gains (losses) arising during the period on securities available for sale, Tax 88   237   (26) 618
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax 0   0   0 0
Other Comprehensive Income (Loss), Tax 205   290   35 803
Tax Effect, period end 1,173 968 705 415 1,173 705
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (2,844) (3,343) (1,214) 289 (3,343) 289
Unrealized holding gains (losses) arising during the period on securities available for sale, net of tax (256)   (694)   77 (1,811)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax (370)   (109)   (222) (420)
Reclassification adjustments for securities gains (losses) realized in net income (net of tax) 0   0   (2) 0
Net change in unrealized gains (losses) on derivative instruments, net of tax (346)   (167)   (187) (560)
Other comprehensive income (loss), net of tax (596) 499 (853) (1,503) (97) (2,356)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (3,440) (2,844) (2,067) (1,214) (3,440) (2,067)
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 (11) (11) (13) (14) (11) (14)
Other Comprehensive Loss, Held-to-maturity Security, Reclassification Adjustment from AOCI for Noncredit Portion of OTTI, before Tax 1   1   1 2
Pre-tax AOCI activity, Period End (10) (11) (12) (13) (10) (12)
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   0   0 0
Tax Effect, period end 2 2 3 3 2 3
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (9) (9) (10) (11) (9) (11)
Reclassification adjustments for Amortization of Unrealized Losses on Securities Transferred to Held to Maturity (net of tax) 1   1   1 2
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (8) (9) (9) (10) (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 (2,984) (3,433) (1,280) 218 (3,433) 218
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax (344)   (931)   103 (2,429)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax         2  
Other Comprehensive Income (Loss), before Tax         105  
Pre-tax AOCI activity, Period End (3,328) (2,984) (2,211) (1,280) (3,328) (2,211)
Tax Effect, period start 758 872 326 (55) 872 (55)
Unrealized holding gains (losses) arising during the period on securities available for sale, Tax 88   237   (26) (618)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax         0  
Other Comprehensive Income (Loss), Tax         (26)  
Tax Effect, period end 846 758 563 326 846 563
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (2,226) (2,561) (954) 163 (2,561) 163
Reclassification adjustments for securities gains (losses) realized in net income (net of tax)         2  
Other comprehensive income (loss), net of tax         79  
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (2,482) (2,226) (1,648) (954) (2,482) (1,648)
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 (255) (468) 303 830 (468) 830
OCI, before Reclassifications, before Tax, Attributable to Parent (496)   (143)   (298) (560)
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent (32)   78   (47) 188
Other Comprehensive Income (Loss), before Tax (464)   (221)   (251) (748)
Pre-tax AOCI activity, Period End (719) (255) 82 303 (719) 82
Tax Effect, period start 65 119 (75) (209) 119 (209)
OCI, before reclassifications, tax, attributable to parent 126   34   76 140
Reclassification from AOCI, Current Period, Tax (8)   20   (12) 48
Other Comprehensive Income (Loss), Tax 118   54   64 188
Tax Effect, period end 183 65 (21) (75) 183 (21)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (190) (349) 228 621 (349) 621
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent 24   (58)   35 140
Other comprehensive income (loss), net of tax           (560)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (536) (190) 61 228 (536) 61
Accumulated Defined Benefit Pension Plans Adjustment [Member]            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Pre-tax AOCI activity, Period Start (562) (569) (639) (647) (569) (647)
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income, before Tax 6   8   13 16
Pre-tax AOCI activity, Period End (556) (562) (631) (639) (556) (631)
Tax Effect, period start 143 145 161 163 145 163
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income, Tax (1)   (1)   (3) (3)
Tax Effect, period end 142 143 160 161 142 160
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (419) (424) (478) (484) (424) (484)
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income (net of tax) 5   7   10 13
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End $ (414) $ (419) $ (471) $ (478) $ (414) $ (471)