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Investments and Fair Value Measurement - Narrative (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Marketable Securities [Line Items] |  |  |  |  |
Proceeds from sale of non-marketable equity securities |  |  | $ 500,000,000 | $ 0 |
Allowance for credit loss | $ 0 |  | 0 |  | $ 0
Total carrying value at the end of the period | 592,000,000 |  | 592,000,000 |  | 6,576,000,000
Non-marketable Debt Securities |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Included in other comprehensive income (loss) |  |  | 1,251,000,000 |  |
Grab |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Included in other comprehensive income (loss) | 1,300,000,000 |  |  |  |
Aurora |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Unrealized gain on investments | 471,000,000 |  | 471,000,000 |  |
Total carrying value at the end of the period | 2,148,000,000 |  | 2,148,000,000 |  | 0
Didi |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Proceeds from sale of non-marketable equity securities |  | $ 500,000,000 |  |  |
Unrealized gain on investments | 1,400,000,000 |  |  |  |
Total carrying value at the end of the period | $ 7,326,000,000 |  | $ 7,326,000,000 |  | $ 6,299,000,000
Common Stock Equivalent | Aurora | Relative weighting |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Measurement input | 0.40 |  | 0.40 |  |
Option Pricing Model | Aurora |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Time to liquidity |  |  | 4 years 6 months |  |
Option Pricing Model | Aurora | Volatility |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Measurement input | 0.68 |  | 0.68 |  |
Option Pricing Model | Aurora | Relative weighting |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Measurement input | 0.60 |  | 0.60 |  |

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- Definition Amount of allowance for credit loss on 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 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 Reference 4: 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=124258926&loc=SL82898722-210454 + Details
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