Investments - Unrealized Capital Losses 1 (Details) $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($) securities	Dec. 31, 2022 securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Available For Sale Securities Change in Loss Position | $	$ (231)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	3,100	1,069
Fair value decline below amortized cost greater than 20%
Available-for-sale Securities Including Securities Pledged [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	543