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Summary of Significant Accounting Policies - Investments (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Summary of Significant Accounting Policies
Equity method investments	$ 86	$ 538
Investments qualifying for proportional amortization method	707
Investments without readily determinable fair values	53	68
Investments in unconsolidated entities	$ 846	$ 606

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Amount of investment that generates income tax credit and other income tax benefit under tax credit program elected to be accounted for using proportional amortization method. Includes, but is not limited to, investment under program not meeting condition for accounting under proportional amortization method.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Amount of investment in equity security without readily determinable fair value.

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Amount of investment in equity method investee and investment in and advance to affiliate.

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