Derivative Financial Instruments and Off-balance Sheet Financial Instruments - OTC cash and securities collateral pledged (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Derivative Financial Instruments and Off-balance sheet Financial Instruments
Pledged by the Company	$ 11
Pledged to the Company	12
Collateral posted under MNAs for contracts containing credit-risk contingent features	$ 10	$ 0

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624258-113959

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