Loans and Allowance for Credit Losses - Activity in Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 7,977	$ 7,915	$ 7,947	$ 7,925
Provision for credit losses	538	501	1,114	1,038
Loans charged-off	676	683	1,359	1,373
Less recoveries of loans charged-off	(140)	(129)	(277)	(272)
Net loan charge-offs (recoveries)	536	554	1,082	1,101
Balance at end of period	7,979	7,862	7,979	7,862
Add
Provision for credit losses	538	501	1,114	1,038
Deduct
Loans charged-off	676	683	1,359	1,373
Less recoveries of loans charged-off	(140)	(129)	(277)	(272)
Net loan charge-offs (recoveries)	536	554	1,082	1,101
Commercial \| Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	1,825	1,694	1,806	1,671
Provision for credit losses	63	87	203	211
Loans charged-off	122	86	266	205
Less recoveries of loans charged-off	(26)	(21)	(49)	(39)
Net loan charge-offs (recoveries)	96	65	217	166
Balance at end of period	1,792	1,716	1,792	1,716
Add
Provision for credit losses	63	87	203	211
Deduct
Loans charged-off	122	86	266	205
Less recoveries of loans charged-off	(26)	(21)	(49)	(39)
Net loan charge-offs (recoveries)	96	65	217	166
Commercial \| Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	1,249	1,432	1,288	1,508
Provision for credit losses	(6)	9	(53)	(71)
Loans charged-off	20	74	24	99
Less recoveries of loans charged-off	(7)	(17)	(19)	(46)
Net loan charge-offs (recoveries)	13	57	5	53
Balance at end of period	1,230	1,384	1,230	1,384
Add
Provision for credit losses	(6)	9	(53)	(71)
Deduct
Loans charged-off	20	74	24	99
Less recoveries of loans charged-off	(7)	(17)	(19)	(46)
Net loan charge-offs (recoveries)	13	57	5	53
Consumer \| Residential mortgages
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	725	789	747	783
Provision for credit losses	9	(33)	(14)	(27)
Loans charged-off	5	4	8	8
Less recoveries of loans charged-off	(5)	(5)	(9)	(9)
Net loan charge-offs (recoveries)	0	(1)	(1)	(1)
Balance at end of period	734	757	734	757
Add
Provision for credit losses	9	(33)	(14)	(27)
Deduct
Loans charged-off	5	4	8	8
Less recoveries of loans charged-off	(5)	(5)	(9)	(9)
Net loan charge-offs (recoveries)	0	(1)	(1)	(1)
Consumer \| Credit card
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	3,343	3,162	3,274	3,144
Provision for credit losses	397	406	831	811
Loans charged-off	446	442	885	896
Less recoveries of loans charged-off	(79)	(62)	(153)	(129)
Net loan charge-offs (recoveries)	367	380	732	767
Balance at end of period	3,373	3,188	3,373	3,188
Add
Provision for credit losses	397	406	831	811
Deduct
Loans charged-off	446	442	885	896
Less recoveries of loans charged-off	(79)	(62)	(153)	(129)
Net loan charge-offs (recoveries)	367	380	732	767
Consumer \| Other retail
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	835	838	832	819
Provision for credit losses	75	32	147	114
Loans charged-off	83	77	176	165
Less recoveries of loans charged-off	(23)	(24)	(47)	(49)
Net loan charge-offs (recoveries)	60	53	129	116
Balance at end of period	850	817	850	817
Add
Provision for credit losses	75	32	147	114
Deduct
Loans charged-off	83	77	176	165
Less recoveries of loans charged-off	(23)	(24)	(47)	(49)
Net loan charge-offs (recoveries)	$ 60	$ 53	$ 129	$ 116

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease.

+ References

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-Topic 326
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- Definition

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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- Definition

Amount, excluding accrued interest, of decrease (increase) in allowance for credit loss on financing receivable from writeoff (recovery). Excludes net investment in lease.

+ References

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- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

+ References

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