v3.19.3

Investments and Fair Value Measurement - Fair Value of Unobservable Inputs, Assets (Details) - USD ($) $ in Millions	6 Months Ended	9 Months Ended
	Jun. 30, 2019	Sep. 30, 2019
Debt Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance as of December 31, 2018	$ 2,370	$ 2,370
Total net gains (losses)
Included in earnings		(8)
Included in other comprehensive income (loss)		0
Purchases		4
Transfers		0
Balance as of September 30, 2019		2,366
Non-marketable equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance as of December 31, 2018	0	0
Total net gains (losses)
Included in earnings	22	(12)
Included in other comprehensive income (loss)		0
Purchases		11
Transfers		88
Balance as of September 30, 2019		$ 87
Warrants vested during period	$ 35

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- Definition

Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation, Total Net Gains (Losses) [Abstract]

+ References

No definition available.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

+ References

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-Publisher FASB
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- Definition

Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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- Definition

Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

+ References

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-Publisher FASB
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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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