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Investments - Short-Term and Long-Term Investment Securities (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Investment securities
Total available-for-sale investment securities	$ 1,333	$ 330
Total held-to-maturity investment securities	175	234
Total investments in debt securities	1,508	564
Time deposits
Investment securities
Total available-for-sale investment securities	1,310	290
Commercial paper
Investment securities
Total available-for-sale investment securities	7	24
Debt securities
Investment securities
Total available-for-sale investment securities	16	16
Corporate bonds
Investment securities
Total held-to-maturity investment securities	$ 175	$ 234

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