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Investment Information - Cash and restricted cash (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023
Disclosure Investment Information [Abstract]
Cash	$ 983	$ 979
Restricted cash (included in ‘other assets’)	825	781
Cash and restricted cash	$ 1,808	$ 1,760	$ 1,627	$ 1,498

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Amount of cash and cash equivalent. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

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