Financing Receivables - Credit Quality Information - Syndicated Loans (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Financing receivables - credit quality information
Loan write-offs	$ 2	$ 1
Commercial Loans
Financing receivables - credit quality information
Loan write-offs	1	$ 0
Commercial Loans | Syndicated loans
Financing receivables - credit quality information
Loan write-offs	0
Amortized cost basis by year of origination and loan-to-value ratio
Year 1	5		$ 15
Year 2	14		39
Year 3	36		12
Year 4	12		26
Year 5	24		23
Prior	63		60
Total amortized cost basis	154		175
Commercial Loans | Syndicated loans | Risk 5
Amortized cost basis by year of origination and loan-to-value ratio
Year 1	0		1
Year 2	1		0
Year 3	0		0
Year 4	0		0
Year 5	0		0
Prior	0		0
Total amortized cost basis	1		1
Commercial Loans | Syndicated loans | Risk 4
Amortized cost basis by year of origination and loan-to-value ratio
Year 1	0		0
Year 2	0		0
Year 3	0		0
Year 4	1		2
Year 5	2		0
Prior	1		2
Total amortized cost basis	4		4
Commercial Loans | Syndicated loans | Risk 3
Amortized cost basis by year of origination and loan-to-value ratio
Year 1	0		0
Year 2	0		9
Year 3	8		1
Year 4	1		6
Year 5	2		5
Prior	13		8
Total amortized cost basis	24		29
Commercial Loans | Syndicated loans | Risk 2
Amortized cost basis by year of origination and loan-to-value ratio
Year 1	0		8
Year 2	8		21
Year 3	19		7
Year 4	6		12
Year 5	11		5
Prior	23		28
Total amortized cost basis	67		81
Commercial Loans | Syndicated loans | Risk 1
Amortized cost basis by year of origination and loan-to-value ratio
Year 1	5		6
Year 2	5		9
Year 3	9		4
Year 4	4		6
Year 5	9		13
Prior	26		22
Total amortized cost basis	58		60
Commercial Loans | Syndicated loans | Past due
Amortized cost basis by year of origination and loan-to-value ratio
Total amortized cost basis	$ 0		$ 0