Equity Securities, Gains (Losses) Measurement Alternative (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Net Gains (Losses) from Measurement Alternative Equity Securities
Total net gains (losses) recognized during the period	$ (1,401)	$ 814
Measurement alternative [Member] \| Nonmarketable equity securities [Member]
Net Gains (Losses) from Measurement Alternative Equity Securities
Gross unrealized gains due to observable price changes	222	185
Gross unrealized losses due to observable price changes	0	0
Impairment write-downs	(354)	(22)
Realized net gains from sale	2	23
Total net gains (losses) recognized during the period	(130)	$ 186
Measurement Alternative Cumulative Gains (Losses)
Cumulative gross unrealized gains due to observable price changes	1,084		$ 973
Cumulative gross unrealized losses due to observable price changes	(42)		(42)
Cumulative impairment write-downs	$ (473)		$ (134)

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
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Amount of cumulative loss from downward price adjustment on investment in equity security without readily determinable fair value.

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

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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 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=116654751&loc=SL75117539-209714

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
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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
-Publisher FASB
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-Topic 230
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-Section 45
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The revenue derived from equity investments held at fair value (excluding trading securities), and investments accounted for under both the equity method and measurement alternative. Includes marketable equity securities, private equity, and principal investments: includes realized investment gains or losses.

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