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Financial Instruments - Information on Available-for-sale Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt securities, amortized cost | $ 412 |  | $ 412 |  | $ 86
Debt securities, unrealized gains | 0 |  | 0 |  | 0
Debt securities, unrealized losses | 0 |  | 0 |  | 0
Debt securities, fair value | 412 |  | 412 |  | 86
Publicly traded equity securities, fair value | 1,530 |  | 1,530 |  | 1,647
Total debt and publicly traded equity securities, fair value | 1,942 |  | 1,942 |  | 1,733
Unrealized net (gains) losses | (25) | $ 18 | 194 | $ 199 |
Commercial paper |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt securities, amortized cost | 334 |  | 334 |  | 0
Debt securities, unrealized gains | 0 |  | 0 |  | 0
Debt securities, unrealized losses | 0 |  | 0 |  | 0
Debt securities, fair value | 334 |  | 334 |  | 0
U.S. government and agency securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt securities, amortized cost | 72 |  | 72 |  | 80
Debt securities, unrealized gains | 0 |  | 0 |  | 0
Debt securities, unrealized losses | 0 |  | 0 |  | 0
Debt securities, fair value | 72 |  | 72 |  | 80
Corporate notes and bonds |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt securities, amortized cost | 4 |  | 4 |  | 4
Debt securities, unrealized gains | 0 |  | 0 |  | 0
Debt securities, unrealized losses | 0 |  | 0 |  | 0
Debt securities, fair value | 4 |  | 4 |  | 4
Foreign government bonds |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt securities, amortized cost | 2 |  | 2 |  | 2
Debt securities, unrealized gains | 0 |  | 0 |  | 0
Debt securities, unrealized losses | 0 |  | 0 |  | 0
Debt securities, fair value | $ 2 |  | $ 2 |  | $ 2

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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