Loans - Summary of estimated fair value of loans and lending commitments (Detail) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items]
Loans, Carrying Value	$ 128,453	$ 108,904
Loans, Estimated Fair Value	13,829	14,386
Level 2 [Member]
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items]
Loans, Estimated Fair Value	11,076	12,496
Level 3 [Member]
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items]
Loans, Estimated Fair Value	2,753	1,890
Amortized cost [Member]
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items]
Loans, Carrying Value	111,467	89,195
Loans, Estimated Fair Value	108,637	89,186
Amortized cost [Member] \| Level 2 [Member]
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items]
Loans, Estimated Fair Value	54,658	52,091
Amortized cost [Member] \| Level 3 [Member]
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items]
Loans, Estimated Fair Value	53,979	37,095
Held for sale [Member]
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items]
Loans, Carrying Value	3,157	5,323
Loans Receivable Held-for-sale, Amount	3,157	5,323
Loans, Estimated Fair Value	3,210	5,409
Held for sale [Member] \| Level 2 [Member]
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items]
Loans, Estimated Fair Value	1,646	4,157
Held for sale [Member] \| Level 3 [Member]
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items]
Loans, Estimated Fair Value	$ 1,564	$ 1,252

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- Definition

Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2196772

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- Definition

The face amount of loans that will be sold to other entities.

+ References

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