Investments - Fixed Maturity Securities in Continuous Loss Position (Details)	Mar. 31, 2023 security	Mar. 31, 2023 position	Dec. 31, 2022 security	Dec. 31, 2022 position
Gain (Loss) on Securities
Number of positions with a gross unrealized loss (Security)	1,626	1,626	587	587
AAA
Gain (Loss) on Securities
Number of positions with a gross unrealized loss (Security)		173		67
AA
Gain (Loss) on Securities
Number of positions with a gross unrealized loss (Security)		591		217
A
Gain (Loss) on Securities
Number of positions with a gross unrealized loss (Security)		283		94
BBB
Gain (Loss) on Securities
Number of positions with a gross unrealized loss (Security)		327		93
BB
Gain (Loss) on Securities
Number of positions with a gross unrealized loss (Security)		145		68
B
Gain (Loss) on Securities
Number of positions with a gross unrealized loss (Security)		62		31
CCC or lower
Gain (Loss) on Securities
Number of positions with a gross unrealized loss (Security)		4		2
Not rated
Gain (Loss) on Securities
Number of positions with a gross unrealized loss (Security)		41		15