Fair Value Measurement - Equity Securities Without Readily Determinable Fair Value (Details) shares in Millions, $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2025 USD ($) shares	Sep. 30, 2024 USD ($) shares	Sep. 30, 2025 USD ($) shares	Sep. 30, 2024 USD ($) shares	Dec. 31, 2024 USD ($)
Fair Value Disclosures [Abstract]
Carrying value	$ 4,808	$ 3,660	$ 4,808	$ 3,660	$ 3,700
Upward carrying value changes	121	42	199	72
Downward carrying value changes/impairment	(29)	$ (72)	(81)	$ (248)
Cumulative upward carrying value changes	1,300		1,300
Cumulative downward carrying value changes/impairment	$ (1,500)		$ (1,500)
VISA \| Class B-2 Common Shares
Equity Securities without Readily Determinable Fair Value [Line Items]
Interest owned in equity securities without readily determinable fair value (in shares) \| shares	18.6	18.6	18.6	18.6
Conversion rate	1.5223		1.5223
Interest sold in equity securities without readily determinable fair value, subject to derivative instrument (in shares) \| shares	11.6		11.6

Conversion Of Stock, Conversion Rate

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Equity Securities Without Readily Determinable Fair Value, Shares

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- Definition

Amount of investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479536/321-10-50-3

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Amount of loss from downward price adjustment on investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479536/321-10-50-3

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479536/321-10-50-3

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479536/321-10-50-3

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479536/321-10-50-3

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Amount of gain from upward price adjustment on investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479536/321-10-50-3

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