v3.26.3
Investments - Summary of Cost and Carrying Value of Equity and Trading Debt Securities (Detail) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Schedule of Investments [Line Items]    
Total trading debt securities, Cost $ 3,338 $ 2,768
Total trading debt, Carrying Value [1] 3,330 2,789
Equity securities at FVTNI, Carrying Value [1] 3,181 2,282
Corporate Debt [Member]    
Schedule of Investments [Line Items]    
Total trading debt securities, Cost 1,538 1,153
Total trading debt, Carrying Value 1,536 1,185
Government Debt [Member]    
Schedule of Investments [Line Items]    
Total trading debt securities, Cost 676 430
Total trading debt, Carrying Value 670 430
Asset/Mortgage-Backed Debt [Member]    
Schedule of Investments [Line Items]    
Total trading debt securities, Cost 1,124 1,185
Total trading debt, Carrying Value 1,124 1,174
Equity Securities [Member]    
Schedule of Investments [Line Items]    
Equity securities at FVTNI, Cost 2,928 2,049
Equity securities at FVTNI, Carrying Value $ 3,181 $ 2,282
[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 debt securities comprised $27 million as of September 30, 2026, and amounts included within equity securities held at fair value recorded through net income ("FVTNI") comprised $13 million and $37 million at September 30, 2026 and December 31, 2025, respectively.