Fair Value Measurements - Summary of Level 3 Financial Assets (Detail) - USD ($) $ in Millions	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total financial assets at fair value	$ 1,157,158	$ 1,139,251	$ 963,966
Investments at fair value	179,979		124,182
Loans at fair value	4,640		4,905
Other assets at fair value	202		180
Derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total financial assets at fair value	116,680		99,526
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total financial assets at fair value	20,839	20,836	20,324
Loans at fair value	552	591	546
Other assets at fair value	202		180
Level 3 \| Trading cash instruments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading assets at fair value	1,133	1,205	904
Level 3 \| Derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading assets at fair value	4,360		4,283
Total financial assets at fair value	4,360	4,499	4,283
Level 3 \| Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	14,592	14,349	14,411
Level 3 \| Other Asseets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets at fair value	$ 202	$ 192	$ 180

Fair value portion of assets or liabilities pertaining to principal and customer trading transactions

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Fair value portion of asset recognized for present right to economic benefit.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Fair value portion of other assets.

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