Lines of Credit (Additional Information) (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	Oct. 28, 2022	Sep. 30, 2022	Dec. 31, 2021
Line of Credit Facility [Line Items]
Partnership Capital Subject To Mandatory Redemption Net Of Reserve For Anticipated Withdrawals And Partnership Loans		$ 3,510	$ 3,235
2018 Credit Facility [Member]
Line of Credit Facility [Line Items]
Committed revolving line of credit		$ 500
Maximum Leverage Ratio Required To Be Maintained By Partnership		35.00%
Partnership Capital Subject To Mandatory Redemption Net Of Reserve For Anticipated Withdrawals And Partnership Loans		$ 1,884
Required Minimum Partnership Capital Net Of Reserve For Anticipated Withdrawals And Partnership Loans		$ 1,344
Minimum Regulatory Net Capital Percentage Of Debit Items		6.00%
Amounts outstanding		$ 0	0
2022 Credit Facility [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Committed revolving line of credit	$ 500
Maximum Leverage Ratio Required To Be Maintained By Partnership	35.00%
Partnership Capital Subject To Mandatory Redemption Net Of Reserve For Anticipated Withdrawals And Partnership Loans	$ 2,809
Required Minimum Partnership Capital Net Of Reserve For Anticipated Withdrawals And Partnership Loans	$ 1,594
Minimum Regulatory Net Capital Percentage Of Debit Items	6.00%
Uncommitted Secured Credit Facilities [Member]
Line of Credit Facility [Line Items]
Amounts outstanding		$ 0	$ 0