Debt - Schedule of Short-term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Short-term Debt [Line Items]
Federal Home Loan Bank	$ 1,625	$ 2,550
Securities sold under agreements to repurchase	0	747
Total short-term borrowings	$ 1,625	$ 3,297
Weighted average interest rate	4.70%	5.60%
Cash collateral received		$ 6
Non-cash collateral received		1
Unsecured debt
Short-term Debt [Line Items]
Federal Home Loan Bank	$ 0	0
Securities sold under agreements to repurchase	0	0
Total short-term borrowings	0	0
Secured debt
Short-term Debt [Line Items]
Federal Home Loan Bank	1,625	2,550
Securities sold under agreements to repurchase	0	747
Total short-term borrowings	$ 1,625	$ 3,297