Loans and Related Allowance for Credit Losses (Rollforward of Allowance for Credit Losses) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 4,868	$ 5,361	$ 2,742
Acquisition PCD reserves		1,056
Charge-offs	(985)	(1,101)	(1,192)
Recoveries	422	444	360
Net (charge-offs)	(563)	(657)	(832)
Provision for (recapture of) credit losses	439	(887)	2,985
Other	(3)	(5)	3
Ending balance	4,741	4,868	5,361
Allowance For Unfunded Lending Related Commitments [Roll Forward]
Beginning balance	662	584	318
Acquisition PCD reserves		46
Provision for (recapture of) credit losses	32	32	87
Ending balance	694	662	584
Allowance for credit loss and off-balance sheet liability	5,435	5,530	5,945
Allowances for investment securities and other financial assets	176	171	109
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance			463
Allowance For Unfunded Lending Related Commitments [Roll Forward]
Beginning balance			179
Ending balance
Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	4,868	5,361	3,205
Ending balance		4,868	5,361
Allowance For Unfunded Lending Related Commitments [Roll Forward]
Beginning balance	662	584	497
Ending balance		662	584
Commercial
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,185	3,337	1,812
Acquisition PCD reserves		774
Charge-offs	(307)	(434)	(407)
Recoveries	114	106	94
Net (charge-offs)	(193)	(328)	(313)
Provision for (recapture of) credit losses	126	(594)	2,139
Other	(4)	(4)	3
Ending balance	3,114	3,185	3,337
Allowance For Unfunded Lending Related Commitments [Roll Forward]
Beginning balance	564	485	316
Acquisition PCD reserves		43
Provision for (recapture of) credit losses	49	36	116
Ending balance	613	564	485
Allowance for credit loss and off-balance sheet liability	3,727	3,749	3,822
Commercial \| Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance			(304)
Allowance For Unfunded Lending Related Commitments [Roll Forward]
Beginning balance			53
Ending balance
Commercial \| Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,185	3,337	1,508
Ending balance		3,185	3,337
Allowance For Unfunded Lending Related Commitments [Roll Forward]
Beginning balance	564	485	369
Ending balance		564	485
Consumer
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,683	2,024	930
Acquisition PCD reserves		282
Charge-offs	(678)	(667)	(785)
Recoveries	308	338	266
Net (charge-offs)	(370)	(329)	(519)
Provision for (recapture of) credit losses	313	(293)	846
Other	1	(1)
Ending balance	1,627	1,683	2,024
Allowance For Unfunded Lending Related Commitments [Roll Forward]
Beginning balance	98	99	2
Acquisition PCD reserves		3
Provision for (recapture of) credit losses	(17)	(4)	(29)
Ending balance	81	98	99
Allowance for credit loss and off-balance sheet liability	1,708	1,781	2,123
Consumer \| Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance			767
Allowance For Unfunded Lending Related Commitments [Roll Forward]
Beginning balance			126
Ending balance
Consumer \| Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,683	2,024	1,697
Ending balance		1,683	2,024
Allowance For Unfunded Lending Related Commitments [Roll Forward]
Beginning balance	$ 98	99	128
Ending balance		$ 98	$ 99

Allowance For Unfunded Lending Related Commitments

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- Definition

Debt Securities, Available-For-Sale And Held-To-Maturity, And Other Financial Assets, Allowance for Credit Loss

+ References

No definition available.

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- Definition

Total allowance for credit losses related to loans, including the allowance for loan and lease losses and allowance for unfunded lending related commitments

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Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Other Increase (Decrease)

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Off-Balance Sheet, Credit Loss, Liability, Purchased with Credit Deterioration, Allowance for Credit Loss

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (e)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

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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, 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

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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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

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- Definition

Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

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Amount, excluding accrued interest, of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 19
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919265-210447

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-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=121611286&loc=d3e11927-110247

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-Name Accounting Standards Codification
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Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

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