Variable Interest Entities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Long-term senior note issued in exchange for corporate bond available for sale security	$ 275
Surplus notes	0
Maximum exposure to loss related to unconsolidated VIE's	0
Other investments	4,757	$ 3,577
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Other investments	$ 4,000	$ 3,000