Variable Interest Entities - Additional Information (Details) $ in Millions	Dec. 31, 2021 USD ($) entity	Dec. 31, 2020 USD ($)
Investments In Variable Interest Entities [Abstract]
Number of consolidated entities | entity	3
Variable Interest Entity [Line Items]
Investments in statutory trusts for junior subordinated sebt	$ 6
Junior Subordinated Debentures payable	90
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum Exposure to Loss in Unconsolidated VIEs	794
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum Exposure to Loss in Unconsolidated VIEs	$ 1,233	$ 859