Investments (Credit quality indicator) (Details) - Mortgage loans $ in Millions	Jun. 30, 2022 USD ($)
Debt Securities, Available-for-sale [Line Items]
2022	$ 80
2021	95
2020	150
2019	220
2018	64
Prior	356
Total	965
DSCR ≥1.6x | LTV less than 55%
Debt Securities, Available-for-sale [Line Items]
2022	9
2021	14
2020	112
2019	21
2018	54
Prior	280
Total	490
DSCR ≥1.6x | LTV 55% to 65%
Debt Securities, Available-for-sale [Line Items]
2022	0
2021	0
2020	0
2019	8
2018	0
Prior	0
Total	8
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	0
2021	49
2020	14
2019	78
2018	10
Prior	44
Total	195
DSCR 1.2x - 1.6x | LTV 55% to 65%
Debt Securities, Available-for-sale [Line Items]
2022	28
2021	0
2020	24
2019	0
2018	0
Prior	8
Total	60
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	0
2021	0
2020	0
2019	52
2018	0
Prior	17
Total	69
DSCR ≤1.2 | LTV 55% to 65%
Debt Securities, Available-for-sale [Line Items]
2022	0
2021	0
2020	0
2019	55
2018	0
Prior	0
Total	55
DSCR ≤1.2 | LTV greater than 65%
Debt Securities, Available-for-sale [Line Items]
2022	10
2021	21
2020	0
2019	6
2018	0
Prior	7
Total	$ 44