Equity Securities Measurement Alternative Cumulative Gains (Losses) (Details) - Nonmarketable equity securities [Member] - Measurement alternative [Member] - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Measurement Alternative Cumulative Gains (Losses)
Gross unrealized gains from observable price changes	$ 6,957	$ 6,278
Gross unrealized losses from observable price changes	(3)	(3)
Impairment write-downs	$ (1,216)	$ (821)

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117539-209714

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- Definition

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

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- Definition

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117539-209714

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