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Fair Value Measurement - Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Assets of consolidated investment vehicles (includes $5,363 and $4,902, at fair value) | $ 5,493 | $ 5,271
Other assets (includes $148 and $132, at fair value) | 597 | 470
Long-term debt | (1,675) | (1,673)
Liabilities of CIVs | (4,625) | (4,436)
Other liabilities | (457) | (569)
Repurchase agreement liability | 35 | 37
Carrying Amount |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Assets of consolidated investment vehicles (includes $5,363 and $4,902, at fair value) | 46 | 171
Other assets (includes $148 and $132, at fair value) | 92 | 134
Financial guaranty insurance contracts | (2,335) | (2,394)
Long-term debt | (1,675) | (1,673)
Liabilities of CIVs | (170) | (586)
Other liabilities | (43) | (45)
Estimated Fair Value |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Assets of consolidated investment vehicles (includes $5,363 and $4,902, at fair value) | 46 | 171
Other assets (includes $148 and $132, at fair value) | 93 | 135
Financial guaranty insurance contracts | (986) | (2,315)
Long-term debt | (1,477) | (1,832)
Liabilities of CIVs | (170) | (586)
Other liabilities | $ (43) | $ (45)

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- Definition Assets of Consolidated Investment Vehicles + References No definition available. + Details
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- Definition This element represents the net financial guaranty contract position for the entity, consisting of premiums receivable, ceded unearned premium reserve, reinsurance recoverable on unpaid losses, salvage and subrogation recoverable, unearned premium reserve, loss and loss adjustment expense reserve, and reinsurance balances payable, net. + References No definition available. + Details
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- Definition Liabilities of Consolidated Investment Vehicles + References No definition available. + Details
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- Definition Amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(1)(ii)(A)(ii)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(1)(i)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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- Definition Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI https://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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