Investment Securities - Gross Unrealized Losses and Fair Value of Company's Investment Securities (Detail) $ in Millions	Mar. 31, 2023 USD ($)
Continuous Gross Unrealized Losses And Fair Value [Abstract]
Fair Value Less Than 12 Months	$ 14,177
Unrealized Losses Less Than 12 Months	(422)
Fair Value 12 Months or Greater	48,071
Unrealized Losses 12 Months or Greater	(6,813)
Fair Value Total	62,248
Unrealized Losses Total	(7,235)
U.S. Treasury and Agencies [Member]
Continuous Gross Unrealized Losses And Fair Value [Abstract]
Fair Value Less Than 12 Months	359
Unrealized Losses Less Than 12 Months	(11)
Fair Value 12 Months or Greater	17,134
Unrealized Losses 12 Months or Greater	(2,359)
Fair Value Total	17,493
Unrealized Losses Total	(2,370)
Residential Mortgage-Backed Securities [Member]
Continuous Gross Unrealized Losses And Fair Value [Abstract]
Fair Value Less Than 12 Months	6,121
Unrealized Losses Less Than 12 Months	(252)
Fair Value 12 Months or Greater	19,435
Unrealized Losses 12 Months or Greater	(2,077)
Fair Value Total	25,556
Unrealized Losses Total	(2,329)
Asset-Backed Securities [Member]
Continuous Gross Unrealized Losses And Fair Value [Abstract]
Fair Value Less Than 12 Months	3,140
Unrealized Losses Less Than 12 Months	(33)
Fair Value Total	3,140
Unrealized Losses Total	(33)
Obligations of State and Political Subdivisions [Member]
Continuous Gross Unrealized Losses And Fair Value [Abstract]
Fair Value Less Than 12 Months	4,550
Unrealized Losses Less Than 12 Months	(126)
Fair Value 12 Months or Greater	4,198
Unrealized Losses 12 Months or Greater	(950)
Fair Value Total	8,748
Unrealized Losses Total	(1,076)
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	7,300
Unrealized Losses 12 Months or Greater	(1,427)
Fair Value Total	7,300
Unrealized Losses Total	(1,427)
Non Agency Securities [Member] \| Commercial Mortgage Backed Securities [Member]
Continuous Gross Unrealized Losses And Fair Value [Abstract]
Fair Value Less Than 12 Months	7
Fair Value Total	$ 7

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 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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