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Loans And The Allowance For Credit Losses (Analysis Of The Allowance For Credit Losses By Portfolio Segment) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses, beginning of period	$ 1,612	$ 1,621	$ 1,613	$ 1,576
Provision for loan losses	104	103	339	370
Loan Losses:
Charge-offs	(160)	(143)	(438)	(407)
Recoveries	25	26	67	68
Net loan losses	(135)	(117)	(371)	(339)
Allowance for loan losses, end of period	1,581	1,607	1,581	1,607
Reserve For Unfunded Credit Commitments [Roll Forward]
Reserve for unfunded credit commitments, beginning of year	131	111	116	124
Provision (credit) for unfunded credit losses	1	10	16	(3)
Reserve for unfunded credit commitments, end of year	132	121	132	121
Allowance for credit losses	1,713	1,728	1,713	1,728
Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses, beginning of period	747	736	743	722
Provision for loan losses	86	47	197	166
Loan Losses:
Charge-offs	(58)	(71)	(187)	(194)
Recoveries	11	15	33	33
Net loan losses	(47)	(56)	(154)	(161)
Allowance for loan losses, end of period	786	727	786	727
Reserve For Unfunded Credit Commitments [Roll Forward]
Reserve for unfunded credit commitments, beginning of year	99	85	91	92
Provision (credit) for unfunded credit losses	3	8	11	1
Reserve for unfunded credit commitments, end of year	102	93	102	93
Allowance for credit losses	888	820	888	820
Investor Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses, beginning of period	234	233	240	192
Provision for loan losses	(47)	10	(29)	54
Loan Losses:
Charge-offs	(34)	(12)	(58)	(17)
Recoveries	2	0	2	2
Net loan losses	(32)	(12)	(56)	(15)
Allowance for loan losses, end of period	155	231	155	231
Reserve For Unfunded Credit Commitments [Roll Forward]
Reserve for unfunded credit commitments, beginning of year	13	8	7	13
Provision (credit) for unfunded credit losses	(3)	2	3	(3)
Reserve for unfunded credit commitments, end of year	10	10	10	10
Allowance for credit losses	165	241	165	241
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses, beginning of period	631	652	630	662
Provision for loan losses	65	46	171	150
Loan Losses:
Charge-offs	(68)	(60)	(193)	(196)
Recoveries	12	11	32	33
Net loan losses	(56)	(49)	(161)	(163)
Allowance for loan losses, end of period	640	649	640	649
Reserve For Unfunded Credit Commitments [Roll Forward]
Reserve for unfunded credit commitments, beginning of year	19	18	18	19
Provision (credit) for unfunded credit losses	1	0	2	(1)
Reserve for unfunded credit commitments, end of year	20	18	20	18
Allowance for credit losses	$ 660	$ 667	$ 660	$ 667

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
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-Publisher FASB
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