Investments - OTTI (Details) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($) securities	Mar. 31, 2022 USD ($) securities
Available-for-sale Securities Including Securities Pledged [Line Items]
No. of Securities | securities	2	11
Other-than-temporary Impairment Loss, Debt Securities, Available-for-Sale, Recognized in Earnings | $	$ 0	$ 5
Residential mortgage-backed
Available-for-sale Securities Including Securities Pledged [Line Items]
No. of Securities | securities	2	11
Other-than-temporary Impairment Loss, Debt Securities, Available-for-Sale, Recognized in Earnings | $	$ 0	$ 5