Investments (Credit quality indicator) (Details) - Mortgage loans $ in Millions	Dec. 31, 2021 USD ($)
Debt Securities, Available-for-sale [Line Items]
2021	$ 95
2020	160
2019	249
2018	79
2017	152
Prior	254
Total	989
DSCR ≥1.6x | LTV less than 55%
Debt Securities, Available-for-sale [Line Items]
2021	2
2020	75
2019	6
2018	38
2017	99
Prior	181
Total	401
DSCR ≥1.6x | LTV 55% to 65%
Debt Securities, Available-for-sale [Line Items]
2021	5
2020	38
2019	15
2018	17
2017	0
Prior	24
Total	99
DSCR ≥1.6x | LTV greater than 65%
Debt Securities, Available-for-sale [Line Items]
2021	17
2020	0
2019	8
2018	0
2017	0
Prior	0
Total	25
DSCR 1.2x - 1.6x | LTV less than 55%
Debt Securities, Available-for-sale [Line Items]
2021	14
2020	14
2019	95
2018	0
2017	5
Prior	42
Total	170
DSCR 1.2x - 1.6x | LTV 55% to 65%
Debt Securities, Available-for-sale [Line Items]
2021	36
2020	0
2019	0
2018	24
2017	10
Prior	0
Total	70
DSCR 1.2x - 1.6x | LTV greater than 65%
Debt Securities, Available-for-sale [Line Items]
2021	0
2020	24
2019	0
2018	0
2017	8
Prior	0
Total	32
DSCR ≤1.2 | LTV less than 55%
Debt Securities, Available-for-sale [Line Items]
2021	0
2020	0
2019	35
2018	0
2017	30
Prior	0
Total	65
DSCR ≤1.2 | LTV 55% to 65%
Debt Securities, Available-for-sale [Line Items]
2021	0
2020	0
2019	28
2018	0
2017	0
Prior	0
Total	28
DSCR ≤1.2 | LTV greater than 65%
Debt Securities, Available-for-sale [Line Items]
2021	21
2020	9
2019	62
2018	0
2017	0
Prior	7
Total	$ 99