Financing Receivables - Credit Quality Information - Financial Advisor Loans (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Financing receivables - credit quality information
Allowance for credit losses	$ 61	$ 52	$ 59	$ 50
Loan write-offs	2	1
Commercial Loans
Financing receivables - credit quality information
Allowance for credit losses	54	49	54	$ 47
Loan write-offs	1	$ 0
Commercial Loans | Loans to financial advisors
Financing receivables - credit quality information
Loan write-offs	0
Amortized cost basis by year of origination and loan-to-value ratio
Year 1	191		359
Year 2	336		179
Year 3	164		134
Year 4	122		101
Year 5	93		77
Prior	200		163
Total amortized cost basis	1,106		1,013
Commercial Loans | Loans to financial advisors | Active
Amortized cost basis by year of origination and loan-to-value ratio
Year 1	191		359
Year 2	336		178
Year 3	163		133
Year 4	120		99
Year 5	91		76
Prior	194		158
Total amortized cost basis	1,095		1,003
Commercial Loans | Loans to financial advisors | Terminated
Financing receivables - credit quality information
Allowance for credit losses	7		6
Amortized cost basis by year of origination and loan-to-value ratio
Year 1	0		0
Year 2	0		1
Year 3	1		1
Year 4	2		2
Year 5	2		1
Prior	6		5
Total amortized cost basis	$ 11		$ 10