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Investments - Schedule of Bank Loans Amortized Cost by Credit Rating and Year of Origination (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Debt Securities, Available-for-Sale [Line Items]
Amortized cost, net	$ 1,040	$ 879
Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	538	490
Allowance	(21)	(17)
Amortized cost, net	517	473
NAIC 1 / A \| Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	268	199
NAIC 2 / BBB \| Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	123	144
NAIC 3 / BB \| Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	38	23
NAIC 4 / B \| Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	99	106
NAIC 5-6 / CCC and below \| Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	10	$ 18
2023 and prior \| Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	20
2023 and prior \| NAIC 1 / A \| Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	0
2023 and prior \| NAIC 2 / BBB \| Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	0
2023 and prior \| NAIC 3 / BB \| Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	1
2023 and prior \| NAIC 4 / B \| Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	18
2023 and prior \| NAIC 5-6 / CCC and below \| Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	1
2024 \| Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	51
2024 \| NAIC 1 / A \| Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	37
2024 \| NAIC 2 / BBB \| Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	0
2024 \| NAIC 3 / BB \| Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	4
2024 \| NAIC 4 / B \| Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	9
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	251
2025 \| NAIC 1 / A \| Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	130
2025 \| NAIC 2 / BBB \| Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	90
2025 \| NAIC 3 / BB \| Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	5
2025 \| NAIC 4 / B \| Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	26
2025 \| NAIC 5-6 / CCC and below \| Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	0
2026 \| Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	216
2026 \| NAIC 1 / A \| Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	101
2026 \| NAIC 2 / BBB \| Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	33
2026 \| NAIC 3 / BB \| Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	28
2026 \| NAIC 4 / B \| Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	46
2026 \| NAIC 5-6 / CCC and below \| Bank loans, net
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	$ 8