Equity Securities, Measurement Alternative Cumulative Gains (Losses) (Details) - Measurement alternative [Member] - Not held for trading [Member] - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Measurement Alternative Cumulative Gains (Losses)
Gross unrealized gains from observable price changes	$ 7,617	$ 7,737
Gross unrealized losses from observable price changes	(101)	(100)
Impairment write-downs	$ (3,755)	$ (3,861)

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

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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Amount of cumulative impairment loss on investment in equity security without readily determinable fair value.

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Amount of cumulative 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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