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Investments - Held-to-maturity Securities by Type and Tenor (Detail) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Amortized Cost |  |
Amortized Cost | $ 73,632 | $ 78,713
Fair Value |  |
Fair Value | $ 74,049 | $ 78,038
Held-to-maturity securities, weighted average yield | 4.23% | 4.09%
Held-to-maturity securities, gross unrealized gains | $ 603 | $ 121
Held-to-maturity securities, gross unrealized losses | 186 | 796
U.S. government obligations |  |
Amortized Cost |  |
Less than 1 year | 10,664 | 15,449
1 year to 5 years | 37,023 | 42,420
Amortized Cost | 47,687 | 57,869
Fair Value |  |
Less than 1 year | 10,623 | 15,409
1 year to 5 years | 37,254 | 41,939
Fair Value | 47,877 | 57,348
U.S. agency obligations |  |
Amortized Cost |  |
Greater than 10 years | 25,766 | 20,637
Amortized Cost | 25,766 | 20,637
Fair Value |  |
Greater than 10 years | 25,992 | 20,482
Fair Value | 25,992 | 20,482
Asset-Backed Securities |  |
Amortized Cost |  |
1 year to 5 years |  | 2
Greater than 10 years | 179 | 205
Amortized Cost | 179 | 207
Fair Value |  |
1 year to 5 years |  | 2
Greater than 10 years | 180 | 206
Fair Value | $ 180 | $ 208

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