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Investments - Available-for-Sale Securities by Tenor (Detail) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Amortized Cost
Amortized Cost	$ 104,105	$ 80,777
Fair Value
Fair Value	103,962	79,458
U.S. government and agency obligations
Amortized Cost
Less than 1 year	10,259	21,176
1 year to 5 years	79,470	48,564
5 years to 10 years	7,421	6,620
Amortized Cost	97,150	76,360
Fair Value
Less than 1 year	10,243	21,011
1 year to 5 years	79,676	47,931
5 years to 10 years	7,386	6,468
Fair Value	97,305	75,410
Non-U.S.
Amortized Cost
1 year to 5 years	6,104	4,224
5 years to 10 years	851	193
Amortized Cost	6,955	4,417
Fair Value
1 year to 5 years	5,837	3,893
5 years to 10 years	820	155
Fair Value	$ 6,657	$ 4,048

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