Loans and Related Allowance for Credit Losses, Allowance for Credit Losses for Loans (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning balance	$ 13,788	$ 19,713
Provision for credit losses	(775)	(1,117)
Interest income on certain loans	(29)	(41)
Loan charge-offs	(647)	(879)
Loan recoveries	342	366
Net loan charge-offs	(305)	(513)
Other	2	1
Allowance for credit losses, ending balance	12,681	18,043
Allowance for loan losses	11,504	16,928	$ 12,490
Allowance for unfunded credit commitments	$ 1,177	$ 1,115
Net loan charge-offs as a percentage of average total loans	0.14%	0.24%
Allowance for loan losses as a percentage of total loans	1.26%	1.96%
Allowance for credit losses for loans as a percentage of total loans	1.39%	2.09%
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Financing receivable, allowance for credit loss, period increase (decrease)	$ (1,100)
Total Commercial [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning balance	7,791	$ 11,516
Provision for credit losses	(665)	(667)
Interest income on certain loans	(9)	(19)
Loan charge-offs	(60)	(232)
Loan recoveries	89	83
Net loan charge-offs	29	(149)
Other	2	1
Allowance for credit losses, ending balance	7,148	10,682
Commercial and industrial loans [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Loan charge-offs	(56)	(159)
Loan recoveries	79	71
Real estate mortgage [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Loan charge-offs	0	(52)
Loan recoveries	5	6
Real estate construction [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Loan charge-offs	0	0
Loan recoveries	0	0
Lease financing [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Loan charge-offs	(4)	(21)
Loan recoveries	5	6
Total Consumer [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning balance	5,997	8,197
Provision for credit losses	(110)	(450)
Interest income on certain loans	(20)	(22)
Loan charge-offs	(587)	(647)
Loan recoveries	253	283
Net loan charge-offs	(334)	(364)
Other	0	0
Allowance for credit losses, ending balance	5,533	7,361
Residential mortgage - first lien [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Loan charge-offs	(25)	(17)
Loan recoveries	28	41
Residential mortgage - junior lien [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Loan charge-offs	(22)	(19)
Loan recoveries	40	38
Credit card [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Loan charge-offs	(267)	(335)
Loan recoveries	91	99
Auto [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Loan charge-offs	(165)	(129)
Loan recoveries	69	77
Other consumer [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Loan charge-offs	(108)	(147)
Loan recoveries	$ 25	$ 28

Percentage of allowance for credit loss to total financing receivable outstanding.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
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Percentage of writeoff after recovery to average financing receivables outstanding.

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Amount of other addition (reduction) in allowance reserve for credit loss.

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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Amount, after recoveries, of loans and leases that have been written-off.

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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- Definition

Amount of increase (decrease) in allowance for credit loss on financing receivable.

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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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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

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- Definition

The amount of interest income on impaired and nonperforming loans that is due to the change in present value attributable to the passage of time.

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- Definition

Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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Amount of expense related to estimated loss from loan and lease transactions.

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Amount of increase in valuation and qualifying accounts and reserves from recovery of amount previously written off or reestablishment of reserve previously utilized.

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Accounts, Notes, Loans and Financing Receivable Textual [Abstract]

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Allowance for loan losses as a percentage of total loans.

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