Income Taxes - Components of income tax (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Current expense (benefit):
United States	$ 332	$ 251	$ 195
Non-U.S.	65	37	6
Current Income Tax Expense (Benefit)	397	288	201
Deferred expense (benefit):
United States	(21)	(20)	(96)
Non-U.S.	(14)	(1,141)	(25)
Deferred Income Tax Expense (Benefit)	(35)	(1,161)	(121)
Income tax expense (benefit)	$ 362	$ (873)	$ 80