Loans and Allowance for Credit Losses - Activity in Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 7,915	$ 7,904	$ 7,925	$ 7,839
Provision for credit losses	501	568	1,038	1,121
Loans charged-off	683	652	1,373	1,247
Less recoveries of loans charged-off	(129)	(114)	(272)	(221)
Net loan charge-offs (recoveries)	554	538	1,101	1,026
Balance at end of period	7,862	7,934	7,862	7,934
Add
Provision for credit losses	501	568	1,038	1,121
Deduct
Loans charged-off	683	652	1,373	1,247
Less recoveries of loans charged-off	(129)	(114)	(272)	(221)
Net loan charge-offs (recoveries)	554	538	1,101	1,026
Commercial \| Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	2,212	2,159	2,175	2,119
Provision for credit losses	155	164	355	320
Loans charged-off	155	180	342	319
Less recoveries of loans charged-off	(27)	(37)	(51)	(60)
Net loan charge-offs (recoveries)	128	143	291	259
Balance at end of period	2,239	2,180	2,239	2,180
Add
Provision for credit losses	155	164	355	320
Deduct
Loans charged-off	155	180	342	319
Less recoveries of loans charged-off	(27)	(37)	(51)	(60)
Net loan charge-offs (recoveries)	128	143	291	259
Commercial \| Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	1,432	1,629	1,508	1,620
Provision for credit losses	9	3	(71)	33
Loans charged-off	74	38	99	72
Less recoveries of loans charged-off	(17)	(2)	(46)	(15)
Net loan charge-offs (recoveries)	57	36	53	57
Balance at end of period	1,384	1,596	1,384	1,596
Add
Provision for credit losses	9	3	(71)	33
Deduct
Loans charged-off	74	38	99	72
Less recoveries of loans charged-off	(17)	(2)	(46)	(15)
Net loan charge-offs (recoveries)	57	36	53	57
Consumer \| Residential mortgages
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	789	843	783	827
Provision for credit losses	(33)	(11)	(27)	5
Loans charged-off	4	3	8	7
Less recoveries of loans charged-off	(5)	(7)	(9)	(11)
Net loan charge-offs (recoveries)	(1)	(4)	(1)	(4)
Balance at end of period	757	836	757	836
Add
Provision for credit losses	(33)	(11)	(27)	5
Deduct
Loans charged-off	4	3	8	7
Less recoveries of loans charged-off	(5)	(7)	(9)	(11)
Net loan charge-offs (recoveries)	(1)	(4)	(1)	(4)
Consumer \| Credit card
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	2,644	2,425	2,640	2,403
Provision for credit losses	338	388	667	706
Loans charged-off	373	358	759	695
Less recoveries of loans charged-off	(56)	(43)	(117)	(84)
Net loan charge-offs (recoveries)	317	315	642	611
Balance at end of period	2,665	2,498	2,665	2,498
Add
Provision for credit losses	338	388	667	706
Deduct
Loans charged-off	373	358	759	695
Less recoveries of loans charged-off	(56)	(43)	(117)	(84)
Net loan charge-offs (recoveries)	317	315	642	611
Consumer \| Other retail
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	838	848	819	870
Provision for credit losses	32	24	114	57
Loans charged-off	77	73	165	154
Less recoveries of loans charged-off	(24)	(25)	(49)	(51)
Net loan charge-offs (recoveries)	53	48	116	103
Balance at end of period	817	824	817	824
Add
Provision for credit losses	32	24	114	57
Deduct
Loans charged-off	77	73	165	154
Less recoveries of loans charged-off	(24)	(25)	(49)	(51)
Net loan charge-offs (recoveries)	$ 53	$ 48	$ 116	$ 103

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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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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