Certain Long-Duration Contracts With Guarantees (Separate Account Investment Options) (Details) - Annuity Contracts - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Separate Account Investment [Line Items]
Separate Account Investment Options	$ 88,720,732	$ 120,211,053
Equity funds
Fair Value, Separate Account Investment [Line Items]
Separate Account Investment Options	43,963,573	69,299,203
Bond funds
Fair Value, Separate Account Investment [Line Items]
Separate Account Investment Options	42,054,051	47,895,089
Money market funds
Fair Value, Separate Account Investment [Line Items]
Separate Account Investment Options	$ 2,703,108	$ 3,016,761