Investments - Schedule of Bank Loans Amortized Cost by Credit Rating and Year of Origination (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]
Amortized cost, net	$ 770	$ 784
Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	290	211
Allowance	(16)	(10)
Amortized cost, net	274	201
NAIC 1 / A | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	128	45
NAIC 2 / BBB | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	11	6
NAIC 3 / BB | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	22	27
NAIC 4 / B | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	120	122
NAIC 5-6 / CCC and below | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	9	$ 11
2020 and prior | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	18
2020 and prior | NAIC 1 / A | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	0
2020 and prior | NAIC 2 / BBB | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	0
2020 and prior | NAIC 3 / BB | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	0
2020 and prior | NAIC 4 / B | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	18
2020 and prior | NAIC 5-6 / CCC and below | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	0
2021 | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	2
2021 | NAIC 1 / A | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	0
2021 | NAIC 2 / BBB | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	0
2021 | NAIC 3 / BB | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	0
2021 | NAIC 4 / B | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	2
2021 | NAIC 5-6 / CCC and below | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	0
2022 | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	4
2022 | NAIC 1 / A | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	0
2022 | NAIC 2 / BBB | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	0
2022 | NAIC 3 / BB | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	1
2022 | NAIC 4 / B | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	3
2022 | NAIC 5-6 / CCC and below | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	0
2023 | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	43
2023 | NAIC 1 / A | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	0
2023 | NAIC 2 / BBB | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	0
2023 | NAIC 3 / BB | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	2
2023 | NAIC 4 / B | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	33
2023 | NAIC 5-6 / CCC and below | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	8
2024 | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	116
2024 | NAIC 1 / A | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	45
2024 | NAIC 2 / BBB | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	11
2024 | NAIC 3 / BB | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	12
2024 | NAIC 4 / B | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	47
2024 | NAIC 5-6 / CCC and below | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	1
2025 | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	107
2025 | NAIC 1 / A | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	83
2025 | NAIC 2 / BBB | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	0
2025 | NAIC 3 / BB | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	7
2025 | NAIC 4 / B | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	17
2025 | NAIC 5-6 / CCC and below | Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	$ 0