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Investments - Equity Securities At Fair Value (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Debt and Equity Securities, FV-NI [Line Items]
Equity securities, at fair value	$ 14,114		$ 14,114		$ 13,832
Equity securities
Debt and Equity Securities, FV-NI [Line Items]
Equity method investment	4,610		4,610		$ 5,040
Fair value option
Debt and Equity Securities, FV-NI [Line Items]
Gains/(losses) recognized on equity securities	$ 0	$ 0	$ (97)	$ (107)
Corporate Equity Securities
Debt and Equity Securities, FV-NI [Line Items]
Percentage of investment in equity securities	77.00%		77.00%		75.00%
Real estate
Debt and Equity Securities, FV-NI [Line Items]
Percentage of investment in equity securities	23.00%		23.00%		25.00%
Corporate and Real estate
Debt and Equity Securities, FV-NI [Line Items]
Percentage of investment in equity securities	100.00%		100.00%		100.00%
Public and Private equity
Debt and Equity Securities, FV-NI [Line Items]
Percentage of investment in equity securities	100.00%		100.00%		100.00%
Public equity
Debt and Equity Securities, FV-NI [Line Items]
Percentage of investment in equity securities	3.00%		3.00%		6.00%
Private equity
Debt and Equity Securities, FV-NI [Line Items]
Percentage of investment in equity securities	97.00%		97.00%		94.00%

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Percentage of Investment In Equity Securities [Member]

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Fair value portion of investments accounted under the equity method.

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