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Loans and Related Allowance for Credit Losses (Rollforward of Allowance for Credit Losses of Loans and Leases) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 4,558	$ 4,714	$ 4,868	$ 5,361
Acquisition PCD reserves		1,115		1,115
Charge-offs	(195)	(428)	(446)	(671)
Recoveries	112	122	226	219
Net (charge-offs)	(83)	(306)	(220)	(452)
Provision for (recapture of) credit losses	(10)	206	(182)	(296)
Other	(3)	1	(4)	2
Ending balance	4,462	5,730	4,462	5,730
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	639	507	662	584
Acquisition PCD reserves		46		46
Provision for (recapture of) credit losses	42	92	19	15
Ending balance	681	645	681	645
Allowance for credit loss	5,143	6,375	5,143	6,375
Allowances for investment securities and other financial assets	163	138	163	138
Total commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,003	3,083	3,185	3,337
Acquisition PCD reserves		828		828
Charge-offs	(37)	(274)	(89)	(343)
Recoveries	19	34	53	52
Net (charge-offs)	(18)	(240)	(36)	(291)
Provision for (recapture of) credit losses	(45)	140	(208)	(64)
Other	(3)	1	(4)	2
Ending balance	2,937	3,812	2,937	3,812
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	587	403	564	485
Acquisition PCD reserves		43		43
Provision for (recapture of) credit losses	43	87	66	5
Ending balance	630	533	630	533
Allowance for credit loss	3,567	4,345	3,567	4,345
Total consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,555	1,631	1,683	2,024
Acquisition PCD reserves		287		287
Charge-offs	(158)	(154)	(357)	(328)
Recoveries	93	88	173	167
Net (charge-offs)	(65)	(66)	(184)	(161)
Provision for (recapture of) credit losses	35	66	26	(232)
Ending balance	1,525	1,918	1,525	1,918
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	52	104	98	99
Acquisition PCD reserves		3		3
Provision for (recapture of) credit losses	(1)	5	(47)	10
Ending balance	51	112	51	112
Allowance for credit loss	$ 1,576	$ 2,030	$ 1,576	$ 2,030

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

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