Derivatives, Hedged Items in Fair Value Hedging Relationships (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Fair Value Hedging Basis Adjustment [Abstract]
Hedged Asset, Statement of Financial Position [Extensible Enumeration]	Available-for-sale, at fair value	Available-for-sale, at fair value
Fair value hedging [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Cumulative basis adjustment associated with hedged items layers	$ (64)	$ (46)
Fair value hedging [Member] \| Available-for-sale debt securities [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Cumulative basis adjustment associated with hedged items layers	(64)	(46)
Amount that represents the hedged items layers	14,500	25,800
Amortized cost basis of the closed portfolios	14,500	28,200
Hedged items currently designated [Member] \| Fair value hedging [Member] \| Available-for-sale debt securities [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying amount of assets	43,786	55,898
Hedge accounting basis adjustment, assets	(2,896)	(2,384)
Hedged items currently designated [Member] \| Fair value hedging [Member] \| Other assets [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying amount of assets	2,931	2,262
Hedge accounting basis adjustment, assets	(6)	67
Hedged items currently designated [Member] \| Fair value hedging [Member] \| Interest-bearing deposits [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying amount of liabilities	(87,366)	(89,641)
Hedge accounting basis adjustment, liabilities	214	(101)
Hedged items currently designated [Member] \| Fair value hedging [Member] \| Long-term debt [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying amount of liabilities	(151,852)	(146,940)
Hedge accounting basis adjustment, liabilities	13,684	10,990
Not designated as hedging instrument [Member] \| Fair value hedging [Member] \| Available-for-sale debt securities [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying amount of assets	15,535	13,418
Hedge accounting basis adjustment, assets	376	504
Not designated as hedging instrument [Member] \| Fair value hedging [Member] \| Other assets [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying amount of assets	0	0
Hedge accounting basis adjustment, assets	0	0
Not designated as hedging instrument [Member] \| Fair value hedging [Member] \| Interest-bearing deposits [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying amount of liabilities	0	0
Hedge accounting basis adjustment, liabilities	0	0
Not designated as hedging instrument [Member] \| Fair value hedging [Member] \| Long-term debt [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying amount of liabilities	0	0
Hedge accounting basis adjustment, liabilities	0	0
Foreign exchange contracts [Member] \| Hedged items currently designated [Member] \| Fair value hedging [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying amount of assets	268	404
Re-designated as hedging instrument [Member] \| Fair value hedging [Member] \| Available-for-sale debt securities [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Hedge accounting basis adjustment, assets	26	32
Re-designated as hedging instrument [Member] \| Fair value hedging [Member] \| Long-term debt [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Hedge accounting basis adjustment, liabilities	$ 632	$ 731

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

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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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 4EE
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-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4EE

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- Definition

Amount of asset hedged in fair value hedging relationship.

+ References

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-Topic 815
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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

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- Definition

Amount of asset hedged in portfolio layer hedging relationship, expected to be remaining at end of hedging relationship.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk, in portfolio layer hedging relationship, excluded from amortized cost of asset included in closed portfolio.

+ References

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- Definition

Indicates line item in statement of financial position that includes hedged asset.

+ References

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- Definition

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

+ References

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- Definition

Amount of liability hedged in fair value hedging relationship.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
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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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- Definition

Fair Value Hedging Basis Adjustment [Abstract]

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