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Summary of Significant Accounting Policies - Investments (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Summary of Significant Accounting Policies |  |
Equity method investments | $ 335 | $ 314
Investments without readily determinable fair values | 48 | 63
Redeemable preferred stock | 49 | 49
Investments in unconsolidated entities | $ 432 | $ 426

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