Variable Interest Entities (Details) - USD ($) $ in Millions		Sep. 30, 2024	Dec. 31, 2023
Variable Interest Entity [Line Items]
Total VIE Assets		$ 73,656	$ 58,906
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Total VIE Assets		1,133	1,242
Remaining Coverage, Amount		326
Variable Interest Entity, Not Primary Beneficiary | 2019-1 Ltd. (Mar-19)
Variable Interest Entity [Line Items]
Total VIE Assets		0	71
Remaining Coverage, Amount		0
Variable Interest Entity, Not Primary Beneficiary | 2019-3 Ltd. (Jul-19)
Variable Interest Entity [Line Items]
Total VIE Assets		0	99
Remaining Coverage, Amount		0
Variable Interest Entity, Not Primary Beneficiary | 2021-3 Ltd. (Sep-21)
Variable Interest Entity [Line Items]
Total VIE Assets		378	429
Remaining Coverage, Amount	[1]	101
Variable Interest Entity, Not Primary Beneficiary | 2022-1 Ltd. (Jan-22)
Variable Interest Entity [Line Items]
Total VIE Assets		216	256
Remaining Coverage, Amount	[1]	17
Variable Interest Entity, Not Primary Beneficiary | 2022-2 Ltd. (Sep-22)
Variable Interest Entity [Line Items]
Total VIE Assets		190	201
Remaining Coverage, Amount	[1]	120
Variable Interest Entity, Not Primary Beneficiary | 2023-1 Ltd. (Oct-23)
Variable Interest Entity [Line Items]
Total VIE Assets		186	186
Remaining Coverage, Amount	[1]	47
Variable Interest Entity, Not Primary Beneficiary | 2024-1 Ltd. (Aug-24)
Variable Interest Entity [Line Items]
Total VIE Assets		163	$ 0
Remaining Coverage, Amount		$ 41

[1] Coverage from a separate panel of reinsurers remaining at September 30, 2024.