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Equity Securities - (Summary of Investments in Non Marketable Equity Securities) (Detail) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Equity Securities Without Readily Determinable Fair Value [Line Items] |  |
Carrying amount | $ 511 | $ 441
Non Marketable Equity Securities |  |
Equity Securities Without Readily Determinable Fair Value [Line Items] |  |
Cost | 281 | 215
Unrealized gains | 230 | 226
Carrying amount | $ 511 | $ 441

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- Definition Amount of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 + Details
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