Investments - Proceeds and Gross Gains/(Losses) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Available for Sale Securities, Gross Realized Gains (Losses), Proceeds on Sales	$ 1,170	$ 596
Debt Securities, Available-for-Sale, Realized Gain	15	7
Debt Securities, Available-for-Sale, Realized Loss	$ 27	$ 21

Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-9

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- Definition

Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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- Definition

Available for Sale Securities, Gross Realized Gains (Losses), Proceeds on Sales

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