Derivatives, Hedged Items in Fair Value Hedging Relationships (Details) - Fair value hedging [Member] - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Hedged items currently designated [Member] \| Available-for-sale debt securities [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying amount of assets	$ 39,287	$ 24,144
Hedge accounting basis adjustment, assets	(4,088)	(559)
Hedged items currently designated [Member] \| Other assets [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying amount of assets	1,505	1,156
Hedge accounting basis adjustment, assets	(132)	(58)
Hedged items currently designated [Member] \| Deposits [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying amount of liabilities	(19,852)	(10,187)
Hedge accounting basis adjustment, liabilities	166	(144)
Hedged items currently designated [Member] \| Long-term debt [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying amount of liabilities	(128,562)	(138,801)
Hedge accounting basis adjustment, liabilities	14,026	(5,192)
Not designated as hedging instrument [Member] \| Available-for-sale debt securities [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying amount of assets	16,515	17,962
Hedge accounting basis adjustment, assets	781	965
Not designated as hedging instrument [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] \| Deposits [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying amount of liabilities	(11)	0
Hedge accounting basis adjustment, liabilities	0	0
Not designated as hedging instrument [Member] \| Long-term debt [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying amount of liabilities	(5)	0
Hedge accounting basis adjustment, liabilities	0	0
Foreign exchange contracts [Member] \| Hedged items currently designated [Member] \| Available-for-sale debt securities [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying amount of assets	699	873
Foreign exchange contracts [Member] \| Hedged items currently designated [Member] \| Long-term debt [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying amount of liabilities	0	(2,700)
Re-designated as hedging instrument [Member] \| Available-for-sale debt securities [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Hedge accounting basis adjustment, assets	41	136
Re-designated as hedging instrument [Member] \| Long-term debt [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Hedge accounting basis adjustment, liabilities	$ 248	$ 188

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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4EE
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL109999712-113959

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- Definition

Amount of asset hedged in fair value hedging relationship.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4EE
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL109999712-113959

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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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4EE
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL109999712-113959

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4EE
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL109999712-113959

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4EE
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL109999712-113959

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- Definition

Fair Value Hedging Basis Adjustment [Abstract]

+ References

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