Financing Receivables - Credit Quality Information - Syndicated Loans (Details) - USD ($)	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing receivables - credit quality information
Loan write-offs	$ 4,000,000	$ 4,000,000	$ 10,000,000
Commercial Loans
Financing receivables - credit quality information
Loan write-offs	2,000,000	3,000,000	$ 8,000,000
Commercial Loans \| Syndicated loans
Financing receivables - credit quality information
Recorded investment	145,000,000	175,000,000
Loan write-offs	0
Amortized cost basis by year of origination and loan-to-value ratio
Originated in current fiscal year	42,000,000	15,000,000
Originated in fiscal year before latest fiscal year	9,000,000	39,000,000
Originated two years before latest fiscal year	44,000,000	12,000,000
Originated three years before latest fiscal year	11,000,000	26,000,000
Originated four years before latest fiscal year	25,000,000	23,000,000
Originated five or more years before latest fiscal year	14,000,000	60,000,000
Total	145,000,000	175,000,000
Commercial Loans \| Syndicated loans \| Risk 5
Financing receivables - credit quality information
Recorded investment	1,000,000	1,000,000
Amortized cost basis by year of origination and loan-to-value ratio
Originated in current fiscal year	0	1,000,000
Originated in fiscal year before latest fiscal year	1,000,000	0
Originated two years before latest fiscal year	0	0
Originated three years before latest fiscal year	0	0
Originated four years before latest fiscal year	0	0
Originated five or more years before latest fiscal year	0	0
Total	1,000,000	1,000,000
Commercial Loans \| Syndicated loans \| Risk 4
Financing receivables - credit quality information
Recorded investment	3,000,000	4,000,000
Amortized cost basis by year of origination and loan-to-value ratio
Originated in current fiscal year	0	0
Originated in fiscal year before latest fiscal year	0	0
Originated two years before latest fiscal year	0	0
Originated three years before latest fiscal year	1,000,000	2,000,000
Originated four years before latest fiscal year	2,000,000	0
Originated five or more years before latest fiscal year	0	2,000,000
Total	3,000,000	4,000,000
Commercial Loans \| Syndicated loans \| Risk 3
Financing receivables - credit quality information
Recorded investment	28,000,000	29,000,000
Amortized cost basis by year of origination and loan-to-value ratio
Originated in current fiscal year	2,000,000	0
Originated in fiscal year before latest fiscal year	0	9,000,000
Originated two years before latest fiscal year	12,000,000	1,000,000
Originated three years before latest fiscal year	2,000,000	6,000,000
Originated four years before latest fiscal year	2,000,000	5,000,000
Originated five or more years before latest fiscal year	10,000,000	8,000,000
Total	28,000,000	29,000,000
Commercial Loans \| Syndicated loans \| Risk 2
Financing receivables - credit quality information
Recorded investment	64,000,000	81,000,000
Amortized cost basis by year of origination and loan-to-value ratio
Originated in current fiscal year	26,000,000	8,000,000
Originated in fiscal year before latest fiscal year	3,000,000	21,000,000
Originated two years before latest fiscal year	17,000,000	7,000,000
Originated three years before latest fiscal year	5,000,000	12,000,000
Originated four years before latest fiscal year	11,000,000	5,000,000
Originated five or more years before latest fiscal year	2,000,000	28,000,000
Total	64,000,000	81,000,000
Commercial Loans \| Syndicated loans \| Risk 1
Financing receivables - credit quality information
Recorded investment	49,000,000	60,000,000
Amortized cost basis by year of origination and loan-to-value ratio
Originated in current fiscal year	14,000,000	6,000,000
Originated in fiscal year before latest fiscal year	5,000,000	9,000,000
Originated two years before latest fiscal year	15,000,000	4,000,000
Originated three years before latest fiscal year	3,000,000	6,000,000
Originated four years before latest fiscal year	10,000,000	13,000,000
Originated five or more years before latest fiscal year	2,000,000	22,000,000
Total	49,000,000	60,000,000
Commercial Loans \| Syndicated loans \| Past due
Financing receivables - credit quality information
Recorded investment	0	0
Amortized cost basis by year of origination and loan-to-value ratio
Total	$ 0	$ 0

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

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