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Equity Securities - (Summary of Investments in Equity Securities, by Accounting Classification) (Detail) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Investments Debt And Equity Securities [Abstract]    
Marketable equity securities $ 392 $ 657
Non-marketable equity securities 511 441
Equity method investments 66 78
Equity Securities $ 969 $ 1,176