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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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