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Debt Securities, Available-For-Sale And Held-To-Maturity, Credit Loss Expense (Reversal)

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- Definition

Investment Securities, Unsettled Investment Purchases, Net

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
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-Name Accounting Standards Codification
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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).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Investment Securities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019	Jun. 30, 2019
Schedule of Investments [Line Items]
Investment securities, allowance for credit loss	$ 32	$ 32
Provision for credit losses on investment securities	30	30
Available for sale debt securities, amortized cost	93,661	93,661		$ 67,790
Available-for-sale securities, fair value	97,052	97,052		69,163
Investment securities, net unsettled investment purchases	347	347			$ 2,000
Held-to-maturity securities, amortized cost	1,441	1,441		17,661
Held-to-maturity securities, fair value	1,615	1,615		$ 18,044
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
Schedule of Investments [Line Items]
Debt securities amortized cost amount of debt securities exceeds 10 percent of shareholders equity	39,600	39,600
Fair value of debt securities of a single issuer that exceeeds 10 percent of shareholders equity	41,100	41,100
Federal Home Loan Mortgage Corporation (FHLMC) Insured Loans [Member]
Schedule of Investments [Line Items]
Debt securities amortized cost amount of debt securities exceeds 10 percent of shareholders equity	10,600	10,600
Fair value of debt securities of a single issuer that exceeeds 10 percent of shareholders equity	10,900	10,900
Cumulative Effect, Period of Adoption, Adjustment \| Accounting Standards Update 2019-04
Schedule of Investments [Line Items]
Available for sale debt securities, amortized cost			$ 16,200
Available-for-sale securities, fair value			16,500
Held-to-maturity securities, amortized cost			(16,200)
Held-to-maturity securities, fair value			$ (16,500)
Cumulative Effect, Period of Adoption, Adjustment \| Accounting Standards Update 2020-04
Schedule of Investments [Line Items]
Available for sale debt securities, amortized cost	49	49
Available-for-sale securities, fair value	48	48
Held-to-maturity securities, amortized cost	(49)	(49)
Held-to-maturity securities, fair value	$ (48)	$ (48)