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Schedule of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
AOCI before Tax, Attributable to Parent $ 793 $ 1,759 $ 1,771 $ (120) $ 1,759 $ (120)
Other Comprehensive Income (Loss), before Tax 78   403   (888) 2,294
AOCI before Tax, Attributable to Parent 871 793 2,174 1,771 871 2,174
AOCI Tax, Attributable to Parent [1] (201) (444) (447) 30 (444) 30
Unrealized holding gains (losses) on available for sale securities, tax 23   61   (115) 212
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax 0   0   0 0
Other Comprehensive Income (Loss), Tax [1] (19)   (101)   224 (578)
AOCI Tax, Attributable to Parent [1] (220) (201) (548) (447) (220) (548)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start 592 1,315 1,324 (90) 1,315 (90)
Unrealized holding gains (losses) arising during the period on securities available for sale (net of tax) 71   185   (339) 631
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax (1)   (1)   (2) (1)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax 56   153   (192) 1,119
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax (22)   108   (346) 1,067
Other comprehensive income, net of tax 59 (723) 302 1,414 (664) 1,716
Accumulated other comprehensive income, net 651 592 1,626 1,324 651 1,626
Accumulated Net Unrealized Loss on Held To Maturity Securities [Member]            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
AOCI before Tax, Attributable to Parent (18) (21) (28) (29) (21) (29)
Other Comprehensive Loss, Held-to-maturity Security, Reclassification Adjustment from AOCI for Noncredit Portion of OTTI, before Tax [2] 1   1   4 2
AOCI before Tax, Attributable to Parent (17) (18) (27) (28) (17) (27)
AOCI Tax, Attributable to Parent [1] 4 5 7 7 5 7
Other Comprehensive Loss, Held-to-maturity Security, Reclassification Adjustment from AOCI for Noncredit Portion of OTTI, Tax [1],[2] 0   0   (1) 0
AOCI Tax, Attributable to Parent [1] 4 4 7 7 4 7
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (14) (16) (21) (22) (16) (22)
Other Comprehensive Loss, Held-to-maturity Security, Adjustment from AOCI for Accretion of Noncredit Portion of OTTI, after Tax [2] 1   1   3 2
Accumulated other comprehensive income, net (13) (14) (20) (21) (13) (20)
Accumulated Net Unrealized Securities Available For Sale Gain (Loss) [Member]            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
AOCI before Tax, Attributable to Parent 513 1,062 871 274 1,062 274
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax 94   246   (454) 843
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax [3] (1)   (1)   (2) (1)
Other Comprehensive Income (Loss), before Tax 93   245   (456) 842
AOCI before Tax, Attributable to Parent 606 513 1,116 871 606 1,116
AOCI Tax, Attributable to Parent [1] (130) (268) (220) (69) (268) (69)
Unrealized holding gains (losses) on available for sale securities, tax [1] (23)   (61)   115 (212)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax [1],[3] 0   0   0 0
Other Comprehensive Income (Loss), Tax [1] (23)   (61)   115 (212)
AOCI Tax, Attributable to Parent [1] (153) (130) (281) (220) (153) (281)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start 383 794 651 205 794 205
Unrealized holding gains (losses) arising during the period on securities available for sale (net of tax) 71   185   (339) 631
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax [3] (1)   (1)   (2) (1)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax (22)          
Other comprehensive income, net of tax 70   184   (341) 630
Accumulated other comprehensive income, net 453 383 835 651 453 835
Accumulated Net Gain (Loss) from Derivative Instruments Designated as Cash Flow Hedges [Member]            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
AOCI before Tax, Attributable to Parent 1,177 1,610 1,712 430 1,610 430
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax 74   205   (257) 1,496
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax [2] (104)   (60)   (206) (69)
Other Comprehensive Income (Loss), before Tax (30)   145   (463) 1,427
AOCI before Tax, Attributable to Parent 1,147 1,177 1,857 1,712 1,147 1,857
AOCI Tax, Attributable to Parent [1] (297) (406) (431) (108) (406) (108)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax [1] (18)   (52)   65 (377)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax [1],[2] 26   15   52 17
Other Comprehensive Income (Loss), Tax [1] 8   (37)   117 (360)
AOCI Tax, Attributable to Parent [1] (289) (297) (468) (431) (289) (468)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start 880 1,204 1,281 322 1,204 322
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax 56   153   (192) 1,119
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax [2] (78)   (45)   (154) (52)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax     108   (346) 1,067
Accumulated other comprehensive income, net 858 880 1,389 1,281 858 1,389
Accumulated Defined Benefit Plans Adjustment [Member]            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
AOCI before Tax, Attributable to Parent (879) (892) (784) (795) (892) (795)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax [4] 14   12   27 23
AOCI before Tax, Attributable to Parent (865) (879) (772) (784) (865) (772)
AOCI Tax, Attributable to Parent [1] 222 225 197 200 225 200
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax [1],[4] (4)   (3)   (7) (6)
AOCI Tax, Attributable to Parent [1] 218 222 194 197 218 194
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (657) (667) (587) (595) (667) (595)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax [4] 10   9   20 17
Accumulated other comprehensive income, net $ (647) $ (657) $ (578) $ (587) $ (647) $ (578)
[1] The impact of all AOCI activity is shown net of the related tax impact, calculated using an effective tax rate of approximately 25%.
[2] Reclassification amount is recognized in net interest income in the consolidated statements of income.
[3] Reclassification amount is recognized in securities gains (losses), net in the consolidated statements of income.
[4] Reclassification amount is recognized in other non-interest expense in the consolidated statements of income. Additionally, these accumulated other comprehensive income (loss) components are included in the computation of net periodic pension cost (see Note 7 for additional details).