v3.26.1
Investments - Held-to-maturity Securities by Type and Tenor (Detail) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Amortized Cost    
Amortized Cost $ 74,889 $ 69,193
Fair Value    
Fair Value $ 75,131 $ 69,721
Held-to-maturity securities, weighted average yield 4.19% 4.20%
Held-to-maturity securities, gross unrealized gains $ 440 $ 643
Held-to-maturity securities, gross unrealized losses 198 115
U.S. government obligations    
Amortized Cost    
Less than 1 year 11,253 11,336
1 year to 5 years 38,610 33,900
5 years to 10 years 2,631  
Greater than 10 years 1 1
Amortized Cost 52,495 45,237
Fair Value    
Less than 1 year 11,222 11,312
1 year to 5 years 38,686 34,214
5 years to 10 years 2,628  
Greater than 10 years 1 1
Fair Value 52,537 45,527
U.S. agency obligations    
Amortized Cost    
Greater than 10 years 22,232 23,785
Amortized Cost 22,232 23,785
Fair Value    
Greater than 10 years 22,431 24,022
Fair Value 22,431 24,022
Asset-Backed Securities    
Amortized Cost    
1 year to 5 years   8
5 years to 10 years 7  
Greater than 10 years 155 163
Amortized Cost 162 171
Fair Value    
1 year to 5 years   7
5 years to 10 years 7  
Greater than 10 years 156 165
Fair Value $ 163 $ 172