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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		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	$ (9)	$ 12	$ (8)	$ 14
Capital markets income
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	49	4	90	56
Capital markets income | Interest Rate Swaps [Member]
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	36	(3)	67	20
Capital markets income | Interest Rate Options [Member]
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	5	2	16	17
Capital markets income | Interest Rate Futures And Forward Commitments [Member]
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	3	3	(1)	12
Capital markets income | Other Contract [Member]
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	5	2	8	7
Mortgage Income [Member]
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	(58)	8	(98)	(42)
Mortgage Income [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	(38)	29	(84)	(38)
Mortgage Income [Member] | Interest Rate Options [Member]
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	1	(2)	(9)	(15)
Mortgage Income [Member] | Interest Rate Futures And Forward Commitments [Member]
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	$ (21)	$ (19)	$ (5)	$ 11

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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