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Equity Securities (Tables) | 12 Months Ended
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Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract] |
Summary of Investments in Equity Securities, by Classification | Investments in equity securities, by classification, are summarized as follows:
|  | December 31, |
(in millions) |  | 2022 |  |  | 2021 |
Marketable equity securities |  | $ | 280 |  |  | $ | 657 |
Non-marketable equity securities |  |  | 396 |  |  |  | 441 |
Equity method investments |  |  | 78 |  |  |  | 78 |
|  | $ | 754 |  |  | $ | 1,176 |
Summary of Investments in Marketable Equity Securities | Investments in marketable equity securities are summarized as follows:
(in millions) |  | Cost |  |  | Unrealized gains (losses) |  |  | Estimated fair value |
December 31, 2022 |  |  |  |  |  |  |  |  |
Common stocks |  | $ | 324 |  |  | $ | (55 | ) |  | $ | 269 |
Preferred stocks |  |  | 15 |  |  |  | (4 | ) |  |  | 11 |
|  | $ | 339 |  |  | $ | (59 | ) |  | $ | 280 |
December 31, 2021 |  |  |  |  |  |  |  |  |
Common stocks |  | $ | 418 |  |  | $ | 222 |  |  | $ | 640 |
Preferred stocks |  |  | 17 |  |  |  | — |  |  |  | 17 |
|  | $ | 435 |  |  | $ | 222 |  |  | $ | 657 |
Summary of Investments in Non-Marketable Equity Securities | Investments in non-marketable equity securities are summarized as follows:
(in millions) |  | Cost |  |  | Unrealized gains |  |  | Carrying amount |
December 31, 2022 |  | $ | 307 |  |  | $ | 89 |  |  | $ | 396 |
December 31, 2021 |  | $ | 215 |  |  | $ | 226 |  |  | $ | 441 |

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- Definition Tabular disclosure of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117539-209714 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117539-209714 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117539-209714 + Details
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