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Investments - Summary of Cost and Carrying Value of Equity and Trading Debt Securities (Detail) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
Total trading debt securities, Cost $ 2,768 $ 1,757
Total trading debt, Fair Value 2,789 1,751
Equity securities at FVTNI, Fair Value [1] 2,282 1,950
Corporate Debt [Member]    
Schedule of Investments [Line Items]    
Total trading debt securities, Cost 1,153 957
Total trading debt, Fair Value 1,185 989
Government Debt [Member]    
Schedule of Investments [Line Items]    
Total trading debt securities, Cost 430 578
Total trading debt, Fair Value 430 557
Asset/Mortgage-Backed Debt [Member]    
Schedule of Investments [Line Items]    
Total trading debt securities, Cost 1,185 222
Total trading debt, Fair Value 1,174 205
Equity Securities [Member]    
Schedule of Investments [Line Items]    
Equity securities at FVTNI, Cost 2,049 1,843
Equity securities at FVTNI, Fair Value $ 2,282 $ 1,950
[1] Amounts include investments held to economically hedge the impact of market valuation changes on certain deferred cash compensation plans. Amounts related to deferred cash compensation plans included within equity securities held at FVTNI comprised $37 million and $12 million at December 31, 2025 and 2024, respectively.