Investments - OTTI (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($) securities	Jun. 30, 2021 USD ($) securities	Jun. 30, 2022 USD ($) securities	Jun. 30, 2021 USD ($) securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Impairment | $	$ 2	$ 0	$ 7	$ 0
No. of Securities | securities	17	4	25	10
Residential mortgage-backed
Available-for-sale Securities Including Securities Pledged [Line Items]
Impairment | $	$ 2	$ 0	$ 7	$ 0
No. of Securities | securities	17	4	25	9
Commercial mortgage-backed
Available-for-sale Securities Including Securities Pledged [Line Items]
Impairment | $	$ 0	$ 0	$ 0	$ 0
No. of Securities | securities	0	0	0	1