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Derivative Financial Instruments and Hedging Activities (Schedule of Gains (Losses) Recognized Related to Derivatives Not Designated as Hedging Instruments) (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	$ 50	$ 5	$ 42	$ 19
Capital markets income
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	67	16	157	72
Capital markets income | Interest Rate Swaps [Member]
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	44	5	111	25
Capital markets income | Interest Rate Options [Member]
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	4	8	20	25
Capital markets income | Interest Rate Futures And Forward Commitments [Member]
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	8	2	7	14
Capital markets income | Other Contract [Member]
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	11	1	19	8
Mortgage Income [Member]
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	(17)	(11)	(115)	(53)
Mortgage Income [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	(28)	(8)	(112)	(46)
Mortgage Income [Member] | Interest Rate Options [Member]
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	(8)	(9)	(17)	(24)
Mortgage Income [Member] | Interest Rate Futures And Forward Commitments [Member]
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	$ 19	$ 6	$ 14	$ 17

X

- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4CC
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL109998890-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959

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- Definition

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.

+ References

No definition available.

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