Investments - OTTI (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) securities	Sep. 30, 2021 USD ($) securities	Sep. 30, 2022 USD ($) securities	Sep. 30, 2021 USD ($) securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Impairment | $	$ 8	$ 0	$ 15	$ 0
No. of Securities | securities	69	2	79	10
Foreign corporate public securities and foreign governments
Available-for-sale Securities Including Securities Pledged [Line Items]
Impairment | $	$ 0	$ 0	$ 0	$ 0
No. of Securities | securities	1	0	1	0
Residential mortgage-backed
Available-for-sale Securities Including Securities Pledged [Line Items]
Impairment | $	$ 8	$ 0	$ 15	$ 0
No. of Securities | securities	66	2	76	9
Commercial mortgage-backed
Available-for-sale Securities Including Securities Pledged [Line Items]
Impairment | $	$ 0	$ 0	$ 0	$ 0
No. of Securities | securities	2	0	2	1