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Summary of Significant Accounting Policies - Carrying Values Of Investment Securities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Schedule of AFS and HTM Securities [Line Items]
Available-for-sale investment securities	$ 1,137	$ 351
Debt securities, held-to-maturity	0	21
Total investment securities	1,137	372
Time deposits
Schedule of AFS and HTM Securities [Line Items]
Available-for-sale investment securities	1,130	325
Commercial paper
Schedule of AFS and HTM Securities [Line Items]
Available-for-sale investment securities	0	20
Debt securities
Schedule of AFS and HTM Securities [Line Items]
Available-for-sale investment securities	7	6
Corporate bonds
Schedule of AFS and HTM Securities [Line Items]
Debt securities, held-to-maturity	$ 0	$ 21

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
-Paragraph 1
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
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-Subparagraph (b)
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