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Fair Value Measurements (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
6.7% Senior Notes
Financial Instruments
Interest rate	6.70%
Institutional and Other | Minimum
Financial Instruments
Interest rate	6.76%	5.38%
Institutional and Other | Maximum
Financial Instruments
Interest rate	7.92%	8.28%
Book Value | Retail
Financial Instruments
Long-term debt	$ 1,500	$ 1,500
Book Value | Institutional
Financial Instruments
Long-term debt	536	536
Book Value | Other
Financial Instruments
Long-term debt	923	1,208
Fair Value | Level 2 | Retail
Financial Instruments
Long-term debt	1,018	899
Fair Value | Level 2 | Institutional
Financial Instruments
Long-term debt	430	395
Fair Value | Level 2 | Other
Financial Instruments
Long-term debt	$ 923	$ 1,208

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Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt classified as noncurrent. Excludes lease obligation.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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