Derivative Financial Instruments and Off-balance Sheet Financial Instruments - Schedule of OTC Cash and Securities Collateral Pledged (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Derivative Financial Instruments and Off-balance sheet Financial Instruments
Pledged by the Company	$ 6
Pledged to the Company	0
Collateral posted under MNAs for contracts containing credit-risk contingent features	$ 5	$ 10

The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4H

Name:	us-gaap_CollateralAlreadyPostedAggregateFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant