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Equity Securities - (Summary of Investments in Marketable Equity Securities) (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Equity securities, Cost | $ 435 | $ 376
Equity securities, Unrealized gains (losses) | 222 | 88
Equity securities, Estimated fair value | 657 | 464
Preferred Stock |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Equity securities, Cost | 17 | 22
Equity securities, Unrealized gains (losses) |  | 3
Equity securities, Estimated fair value | 17 | 19
Common Stock |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Equity securities, Cost | 418 | 354
Equity securities, Unrealized gains (losses) | 222 | 91
Equity securities, Estimated fair value | $ 640 | $ 445

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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740 + Details
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