Variable Interest Entities (Details) - USD ($) $ in Millions		Sep. 30, 2025	Dec. 31, 2024
Variable Interest Entity [Line Items]
Total VIE Assets		$ 79,185	$ 70,906
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Total VIE Assets		426	1,094
Remaining Coverage, Amount		201
Variable Interest Entity, Not Primary Beneficiary | 2021-3 Ltd. (Sep-21)
Variable Interest Entity [Line Items]
Total VIE Assets		21	363
Remaining Coverage, Amount	[1]	16
Variable Interest Entity, Not Primary Beneficiary | 2022-1 Ltd. (Jan-22)
Variable Interest Entity [Line Items]
Total VIE Assets		44	202
Remaining Coverage, Amount	[1]	12
Variable Interest Entity, Not Primary Beneficiary | 2022-2 Ltd. (Sep-22)
Variable Interest Entity [Line Items]
Total VIE Assets		43	180
Remaining Coverage, Amount	[1]	94
Variable Interest Entity, Not Primary Beneficiary | 2023-1 Ltd. (Oct-23)
Variable Interest Entity [Line Items]
Total VIE Assets		164	186
Remaining Coverage, Amount	[1]	41
Variable Interest Entity, Not Primary Beneficiary | 2024-1 Ltd. (Aug-24)
Variable Interest Entity [Line Items]
Total VIE Assets		154	$ 163
Remaining Coverage, Amount	[1]	$ 38

[1] Coverage from a separate panel of reinsurers remaining at September 30, 2025.