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Insurance Contracts - Premium Earned (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Insurance [Line Items] |  |  |  |  |
Premiums Earned, Net | $ 11 | $ 15 | $ 36 | $ 36 |
Direct Premiums Written | (1) | (13) | (6) | (2) |
Direct Premiums Earned | 15 | 18 | 46 | 45 |
Assumed Reinsurance Premiums Written | 0 | 0 | 0 | 0 |
Assumed Reinsurance Premiums Earned | 0 | 0 | 0 | 1 |
Ceded Premiums Written | 14 | 0 | 29 | (1) |
Ceded Reinsurance Premiums Earned | 4 | 3 | 10 | 9 |
Premiums Written, Net | (15) | (13) | (36) | (2) |
Premiums Receivable, Net | $ 327 |  | $ 327 |  | $ 370
Estimated Future Premium Payments Weighted Average Discounted Rate | 2.20% |  | 2.20% |  | 2.20%
Weighted average period of future premiums |  |  | 8 years 1 month 6 days |  | 8 years 3 months 18 days
Reportable Geographical Components [Member] | United States [Member] |  |  |  |  |
Insurance [Line Items] |  |  |  |  |
Premiums Earned, Net | $ 7 | 9 | $ 21 | 24 |
Reportable Geographical Components [Member] | United Kingdom [Member] |  |  |  |  |
Insurance [Line Items] |  |  |  |  |
Premiums Earned, Net | 3 | 7 | 10 | 15 |
Reportable Geographical Components [Member] | Other International [Member] |  |  |  |  |
Insurance [Line Items] |  |  |  |  |
Premiums Earned, Net | $ 1 | $ (1) | $ 5 | $ (2) |

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- Definition Amount of earned premiums assumed from other entities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column D)) -URI http://asc.fasb.org/extlink&oid=120401096&loc=d3e574992-122915 + Details
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- Definition Weighted average period over which premium receivable for financial guarantee insurance contracts is collected where premium is received over the contract period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 50 -Paragraph 3 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=6933075&loc=SL5748726-161290 + Details
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