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Derivative Instruments and Hedging Activities - Hedged Items in Fair Value Hedging Relationship (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Hedged Items In Fair Value Hedging Relationship [Line Items]
Total Assets	$ (16)	$ 33
Discontinued Hedging Relationships, Assets	3,400	2,200
Designated hedged items	2,100	1,500
Investment securities available for sale
Hedged Items In Fair Value Hedging Relationship [Line Items]
Carrying Amount Assets	8,312	6,108
Total Assets	(38)	(8)
Discontinued Hedging Relationships, Assets	78	126
Interest-bearing deposits
Hedged Items In Fair Value Hedging Relationship [Line Items]
Carrying Amount Liabilities	(10,331)	(17,374)
Total Liabilities	160	277
Discontinued Hedging Relationships, Liabilities	0	0
Securitized debt obligations
Hedged Items In Fair Value Hedging Relationship [Line Items]
Carrying Amount Liabilities	(11,011)	(13,375)
Total Liabilities	276	503
Discontinued Hedging Relationships, Liabilities	0	0
Senior and subordinated notes
Hedged Items In Fair Value Hedging Relationship [Line Items]
Carrying Amount Liabilities	(30,696)	(30,899)
Total Liabilities	1,069	971
Discontinued Hedging Relationships, Liabilities	$ (225)	$ (372)

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- Definition

Carry amount of assets hedged in fair value hedging relationship

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The carry amount of liabilities in fair value hedging relationship

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[Line Items] for Table shows the carrying amount and associated cumulative basis adjustment related to the application of hedge accounting that is included in the carrying amount of hedged assets and liabilities in fair value hedging relationships.

+ References

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- Definition

Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk, remaining after discontinued hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 181
-Subparagraph (b)
-Publisher FASB
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-Section 50
-Paragraph 4EE
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-Publisher FASB
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- Definition

Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
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-Paragraph 181
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-URI https://asc.fasb.org/1943274/2147480401/815-10-55-181

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Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk, remaining after discontinued hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4EE
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Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk.

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- Definition

Amortized cost of closed portfolio of financial asset used to designate hedging relationship in which hedged item is expected to be outstanding for designated hedged period.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 815
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