Investments (Credit quality indicator) (Details) - Mortgage loans $ in Millions	Dec. 31, 2022 USD ($)
Debt Securities, Available-for-sale [Line Items]
2022	$ 249
2021	94
2020	150
2019	201
2018	63
Prior	307
Total	1,064
DSCR ≥1.6x | LTV less than 55%
Debt Securities, Available-for-sale [Line Items]
2022	9
2021	13
2020	112
2019	41
2018	53
Prior	255
Total	483
DSCR ≥1.6x | LTV 55% to 65%
Debt Securities, Available-for-sale [Line Items]
2022	13
2021	0
2020	0
2019	0
2018	0
Prior	0
Total	13
DSCR ≥1.6x | LTV greater than 65%
Debt Securities, Available-for-sale [Line Items]
2022	18
2021	11
2020	0
2019	0
2018	0
Prior	0
Total	29
DSCR 1.2x - 1.6x | LTV less than 55%
Debt Securities, Available-for-sale [Line Items]
2022	5
2021	49
2020	18
2019	43
2018	10
Prior	37
Total	162
DSCR 1.2x - 1.6x | LTV 55% to 65%
Debt Securities, Available-for-sale [Line Items]
2022	86
2021	0
2020	20
2019	0
2018	0
Prior	8
Total	114
DSCR 1.2x - 1.6x | LTV greater than 65%
Debt Securities, Available-for-sale [Line Items]
2022	15
2021	0
2020	0
2019	0
2018	0
Prior	0
Total	15
DSCR ≤1.2 | LTV less than 55%
Debt Securities, Available-for-sale [Line Items]
2022	35
2021	0
2020	0
2019	57
2018	0
Prior	0
Total	92
DSCR ≤1.2 | LTV 55% to 65%
Debt Securities, Available-for-sale [Line Items]
2022	41
2021	21
2020	0
2019	38
2018	0
Prior	0
Total	100
DSCR ≤1.2 | LTV greater than 65%
Debt Securities, Available-for-sale [Line Items]
2022	27
2021	0
2020	0
2019	22
2018	0
Prior	7
Total	$ 56