Equity Securities, Net Gains (Losses) from Measurement Alternative Equity Securities (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Net Gains (Losses) from Measurement Alternative Equity Securities
Total net gains (losses) from equity securities not carried at fair value	$ 341	$ (148)
Measurement alternative [Member] \| Not held for trading [Member]
Net Gains (Losses) from Measurement Alternative Equity Securities
Gross unrealized gains from observable price changes	171	43
Gross unrealized losses from observable price changes	0	(25)
Impairment write-downs	(65)	(165)
Net realized gains (losses) from sale	192	15
Total net gains (losses) from equity securities not carried at fair value	$ 298	$ (132)

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- Definition

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

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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
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479536/321-10-50-3

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The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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-Paragraph 28
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-SubTopic 10
-Topic 230
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Total amount of unrealized and realized gain (loss) on equity securities without readily determinable fair value.

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