Fair Value, Option, Carrying Amount (Details) - Fair value option election [Member] - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Option, Quantitative Disclosures [Line Items]
Mortgage loans held for sale	$ 19,884	$ 16,606
Loans held for sale	1,688	972
Loans	148	171
Mortgage loans held for sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Mortgage loans held for sale	19,884	16,606
Mortgage loans held for sale, aggregate unpaid principal	19,131	16,279
Loans, loans held for sale and mortgage loans held for sale, aggregate difference	753	327
Nonaccrual loans	158	133
Nonaccrual loans, aggregate unpaid principal	190	157
Nonaccrual loans, aggregate difference	(32)	(24)
Loans 90 days or more past due and still accruing	21	8
Loans 90 days or more past due and still accruing, aggregate unpaid principal	24	10
Loans 90 days or more past due and still accruing, aggregate difference	(3)	(2)
Loans held for sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans held for sale	1,688	972
Loans held for sale, aggregate unpaid principal	1,777	1,020
Loans, loans held for sale and mortgage loans held for sale, aggregate difference	(89)	(48)
Nonaccrual loans	5	21
Nonaccrual loans, aggregate unpaid principal	39	29
Nonaccrual loans, aggregate difference	(34)	(8)
Loans [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans	148	171
Loans, aggregate unpaid principal	180	201
Loans, loans held for sale and mortgage loans held for sale, aggregate difference	(32)	(30)
Nonaccrual loans	116	129
Nonaccrual loans, aggregate unpaid principal	148	159
Nonaccrual loans, aggregate difference	$ (32)	$ (30)

This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of loans and long-term receivables (other than securities categorized as trading, available-for-sale or held-to-maturity) that have contractual principal amounts and for which the fair value option has been elected.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 28
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This item represents the aggregate fair value of loans held as assets that are 90 days or more past due for which the fair value option has been elected.

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This item represents the aggregate fair value of loans held as assets that are in nonaccrual status for which the fair value option has been elected, if the entity's policy is to recognize interest income separately from other changes in fair value.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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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.

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Fair value portion of mortgage loans held-for-sale.

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For loans held as assets for which the fair value option has been elected, this item represents the aggregate unpaid principal balance of those loans that are 90 days or more past due.

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