v3.26.1
Investments - Held-to-maturity Securities by Type and Tenor (Detail) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Amortized Cost    
Amortized Cost $ 74,658 $ 69,193
Fair Value    
Fair Value $ 74,655 69,721
Held-to-maturity securities, weighted average yield 4.20%  
Held-to-maturity securities, gross unrealized gains $ 343 643
Held-to-maturity securities, gross unrealized losses 346 115
U.S. government obligations    
Amortized Cost    
Less than 1 year 14,092 11,336
1 year to 5 years 35,652 33,900
5 years to 10 years 3,961  
Greater than 10 years 1 1
Amortized Cost 53,706 45,237
Fair Value    
Less than 1 year 14,049 11,312
1 year to 5 years 35,512 34,214
5 years to 10 years 3,945  
Greater than 10 years 1 1
Fair Value 53,507 45,527
U.S. agency obligations    
Amortized Cost    
Greater than 10 years 20,797 23,785
Amortized Cost 20,797 23,785
Fair Value    
Greater than 10 years 20,992 24,022
Fair Value 20,992 24,022
Asset-Backed Securities    
Amortized Cost    
1 year to 5 years   8
5 years to 10 years 7  
Greater than 10 years 148 163
Amortized Cost 155 171
Fair Value    
1 year to 5 years   7
5 years to 10 years 7  
Greater than 10 years 149 165
Fair Value $ 156 $ 172