Lines of Credit - Composition of Partnership's Aggregate Bank Lines of Credit (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Line Of Credit Facility [Line Items]
Line of credit facility	$ 890	$ 890
2022 Credit Facility [Member]
Line Of Credit Facility [Line Items]
Line of credit facility	500	500
Uncommitted Secured Credit Facilities [Member]
Line Of Credit Facility [Line Items]
Line of credit facility	$ 390	$ 390

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant