Fair Value - Narrative (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Carrying amount of equity securities	$ 202,000,000	$ 202,000,000
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount	$ (231,000,000)	$ (231,000,000)

Amount of cumulative impairment loss 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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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant