Financing Receivables - Credit Quality Information - Syndicated Loans (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Financing receivables - credit quality information
Loan write-offs	$ 3	$ 1
Commercial Loans
Financing receivables - credit quality information
Loan write-offs	2	$ 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	20		$ 15
Year 2	20		39
Year 3	40		12
Year 4	9		26
Year 5	21		23
Prior	50		60
Total amortized cost basis	160		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	0		2
Total amortized cost basis	3		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	12		1
Year 4	1		6
Year 5	2		5
Prior	13		8
Total amortized cost basis	28		29
Commercial Loans | Syndicated loans | Risk 2
Amortized cost basis by year of origination and loan-to-value ratio
Year 1	14		8
Year 2	12		21
Year 3	17		7
Year 4	3		12
Year 5	11		5
Prior	16		28
Total amortized cost basis	73		81
Commercial Loans | Syndicated loans | Risk 1
Amortized cost basis by year of origination and loan-to-value ratio
Year 1	6		6
Year 2	7		9
Year 3	11		4
Year 4	4		6
Year 5	6		13
Prior	21		22
Total amortized cost basis	55		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