Derivative Financial Instruments - Schedule of Gross and Net Amounts for OTC Derivatives (Details) - OTC derivatives - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Asset derivatives
Gross amount	$ 2	$ 21
Counter-party netting	(7)	(1)
Cash collateral (received) pledged	6	(18)
Net amount on balance sheet	1	2
Securities collateral (received) pledged	0	0
Net amount	1	2
Liability derivatives
Gross amount	(8)	(1)
Counter-party netting	7	1
Cash collateral (received) pledged	0	0
Net amount on balance sheet	(1)	0
Securities collateral (received) pledged	0	0
Net amount	$ (1)	$ 0