Variable Interest Entities (Details) - USD ($) $ in Millions		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Total VIE Assets		$ 70,906	$ 58,906	$ 47,990
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Total VIE Assets		1,094	1,242
Remaining Coverage, Amount		315
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2019-1 Ltd
Variable Interest Entity [Line Items]
Total VIE Assets		0	71
Remaining Coverage, Amount	[1]	0
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2019-3 Ltd
Variable Interest Entity [Line Items]
Total VIE Assets		0	99
Remaining Coverage, Amount	[1]	0
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2021-3 Ltd
Variable Interest Entity [Line Items]
Total VIE Assets		363	429
Remaining Coverage, Amount	[1]	98
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2022-1 Ltd
Variable Interest Entity [Line Items]
Total VIE Assets		202	256
Remaining Coverage, Amount	[1]	16
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2022-2 Ltd
Variable Interest Entity [Line Items]
Total VIE Assets		180	201
Remaining Coverage, Amount	[1]	113
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2023-1 Ltd
Variable Interest Entity [Line Items]
Total VIE Assets		186	186
Remaining Coverage, Amount	[1]	47
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2024-1 Ltd
Variable Interest Entity [Line Items]
Total VIE Assets		163	$ 0
Remaining Coverage, Amount	[1]	$ 41

[1] Coverage from a separate panel of reinsurers remaining at December 31, 2024