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Schedule of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Pre-tax AOCI activity, period start $ (2,772)   $ 387 $ 871   $ 1,759 $ 387 $ 1,759
Other Comprehensive Income (Loss), before Tax (2,099)     (161)     (5,258) (1,049)
Pre-tax AOCI activity, period end (4,871) $ (2,772)   710 $ 871   (4,871) 710
AOCI, tax, effect, period start 705   (98) (220)   (444) (98) (444)
Unrealized holding gains (losses) on available for sale securities, tax (376)     (24)     (994) (139)
Other Comprehensive Income (Loss), Tax 534     42     1,337 266
AOCI, tax effect, period end 1,239 705   (178) (220)   1,239 (178)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (2,067)   289 651   1,315 289 1,315
Unrealized holding gains (losses) arising during the period on securities available for sale (net of tax) (1,102)     (75)     (2,913) (414)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax 1     0     1 (2)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax (471)     18     (891) (174)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax (471)     (63)     (1,031) (409)
Other comprehensive income (loss), net of tax (1,565) (853) (1,503) (119) 59 (723) (3,921) (783)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (3,632) (2,067)   532 651   (3,632) 532
Accumulated Net Unrealized Loss on Held To Maturity Securities [Member]                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Pre-tax AOCI activity, period start (12)   (14) (17)   (21) (14) (21)
Other Comprehensive Loss, Held-to-maturity Security, Reclassification Adjustment from AOCI for Noncredit Portion of OTTI, before Tax 1     2     3 6
Pre-tax AOCI activity, period end (11) (12)   (15) (17)   (11) (15)
AOCI, tax, effect, period start 3   3 4   5 3 5
Other Comprehensive Loss, Held-to-maturity Security, Reclassification Adjustment from AOCI for Noncredit Portion of OTTI, Tax (1)     0     (1) (1)
AOCI, tax effect, period end 2 3   4 4   2 4
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (9)   (11) (13)   (16) (11) (16)
Other Comprehensive Loss, Held-to-maturity Security, Adjustment from AOCI for Accretion of Noncredit Portion of OTTI, after Tax 0     2     2 5
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (9) (9)   (11) (13)   (9) (11)
Accumulated Net Unrealized Securities Available For Sale Gain (Loss) [Member]                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Pre-tax AOCI activity, period start (2,211)   218 606   1,062 218 1,062
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax (1,478)     (99)     (3,907) (553)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax 1     1     1 (3)
Other Comprehensive Income (Loss), before Tax (1,477)     (100)     (3,906) (556)
Pre-tax AOCI activity, period end (3,688) (2,211)   506 606   (3,688) 506
AOCI, tax, effect, period start 563   (55) (153)   (268) (55) (268)
Unrealized holding gains (losses) on available for sale securities, tax 376     24     994 139
Reclassification from AOCI, Current Period, Tax 0     1     0 (1)
Other Comprehensive Income (Loss), Tax 376     25     994 140
AOCI, tax effect, period end 939 563   (128) (153)   939 (128)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (1,648)   163 453   794 163 794
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax 1     0     1 (2)
Other comprehensive income (loss), net of tax (1,101)     (75)     (2,912) (416)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (2,749) (1,648)   378 453   (2,749) 378
Accumulated Net Gain (Loss) from Derivative Instruments Designated as Cash Flow Hedges [Member]                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Pre-tax AOCI activity, period start 82   830 1,147   1,610 830 1,610
OCI, before Reclassifications, before Tax, Attributable to Parent (632)     24     (1,192) (233)
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent       108     188 314
Other Comprehensive Income (Loss), before Tax       (84)     (1,380) (547)
Pre-tax AOCI activity, period end (550) 82   1,063 1,147   (550) 1,063
AOCI, tax, effect, period start (21)   (209) (289)   (406) (209) (406)
Other Comprehensive Income (Loss) before Reclassifications, Tax 161     (6)     301 59
Reclassification from AOCI, Current Period, Tax       (27)     (48) (79)
Other Comprehensive Income (Loss), Tax       21     349 138
AOCI, tax effect, period end 140 (21)   (268) (289)   140 (268)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start 61   621 858   1,204 621 1,204
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent       (81)     (140) (235)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax       (63)     (1,031) (409)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (410) 61   795 858   (410) 795
Accumulated Defined Benefit Plans Adjustment [Member]                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Pre-tax AOCI activity, period start (631)   (647) (865)   (892) (647) (892)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax 9     21     25 48
Pre-tax AOCI activity, period end (622) (631)   (844) (865)   (622) (844)
AOCI, tax, effect, period start 160   163 218   225 163 225
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax (2)     (4)     (5) (11)
AOCI, tax effect, period end 158 160   214 218   158 214
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (471)   $ (484) (647)   $ (667) (484) (667)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax 7     17     20 37
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End $ (464) $ (471)   $ (630) $ (647)   $ (464) $ (630)