Investment Securities - Gross Unrealized Losses and Fair Value of Company's Investment Securities (Detail) $ in Millions	Jun. 30, 2023 USD ($)
Continuous Gross Unrealized Losses And Fair Value [Abstract]
Fair Value Less Than 12 Months	$ 8,587
Unrealized Losses Less Than 12 Months	(167)
Fair Value 12 Months or Greater	53,638
Unrealized Losses 12 Months or Greater	(7,516)
Fair Value Total	62,225
Unrealized Losses Total	(7,683)
U.S. Treasury and Agencies [Member]
Continuous Gross Unrealized Losses And Fair Value [Abstract]
Fair Value Less Than 12 Months	419
Unrealized Losses Less Than 12 Months	(8)
Fair Value 12 Months or Greater	17,061
Unrealized Losses 12 Months or Greater	(2,353)
Fair Value Total	17,480
Unrealized Losses Total	(2,361)
Residential Mortgage-Backed Securities [Member]
Continuous Gross Unrealized Losses And Fair Value [Abstract]
Fair Value Less Than 12 Months	2,932
Unrealized Losses Less Than 12 Months	(83)
Fair Value 12 Months or Greater	22,463
Unrealized Losses 12 Months or Greater	(2,512)
Fair Value Total	25,395
Unrealized Losses Total	(2,595)
Asset-Backed Securities [Member]
Continuous Gross Unrealized Losses And Fair Value [Abstract]
Fair Value Less Than 12 Months	2,839
Unrealized Losses Less Than 12 Months	(41)
Fair Value Total	2,839
Unrealized Losses Total	(41)
Obligations of State and Political Subdivisions [Member]
Continuous Gross Unrealized Losses And Fair Value [Abstract]
Fair Value Less Than 12 Months	2,391
Unrealized Losses Less Than 12 Months	(34)
Fair Value 12 Months or Greater	6,924
Unrealized Losses 12 Months or Greater	(1,119)
Fair Value Total	9,315
Unrealized Losses Total	(1,153)
Other [Member]
Continuous Gross Unrealized Losses And Fair Value [Abstract]
Fair Value 12 Months or Greater	4
Fair Value Total	4
Agency Securities [Member] \| Commercial Mortgage Backed Securities [Member]
Continuous Gross Unrealized Losses And Fair Value [Abstract]
Fair Value 12 Months or Greater	7,186
Unrealized Losses 12 Months or Greater	(1,532)
Fair Value Total	7,186
Unrealized Losses Total	(1,532)
Non Agency Securities [Member] \| Commercial Mortgage Backed Securities [Member]
Continuous Gross Unrealized Losses And Fair Value [Abstract]
Fair Value Less Than 12 Months	6
Unrealized Losses Less Than 12 Months	(1)
Fair Value Total	6
Unrealized Losses Total	$ (1)

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 5
-URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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