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FAIR VALUE (Tables) | 12 Months Ended
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Dec. 31, 2022
Fair Value Disclosures [Abstract] |
Schedule of Financial Assets Measured at Fair Value on Recurring Basis | The following table summarizes our fair value measurements at December 31, 2022 and 2021, respectively, for financial assets measured at fair value on a recurring basis:
|  |  | Fair Value Measurements Using
| Fair Value |  | Quoted Prices in Active Markets (Level 1) |  | Other Observable Inputs (Level 2) |  | Unobservable Inputs (Level 3)
| (in millions)
December 31, 2022 |  |  |  |  |  |  |
Cash equivalents | $ | 4,832 |  |  | $ | 4,832 |  |  | $ | — |  |  | $ | — |
Debt securities: |  |  |  |  |  |  |
U.S. Treasury and other U.S. government corporations and agencies: |  |  |  |  |  |  |
U.S. Treasury and agency obligations | 1,039 |  |  | — |  |  | 1,039 |  |  | — |
Mortgage-backed securities | 3,230 |  |  | — |  |  | 3,230 |  |  | — |
Tax-exempt municipal securities | 728 |  |  | — |  |  | 728 |  |  | — |
Mortgage-backed securities: |  |  |  |  |  |  |
Residential | 401 |  |  | — |  |  | 401 |  |  | — |
Commercial | 1,399 |  |  | — |  |  | 1,399 |  |  | — |
Asset-backed securities | 1,731 |  |  | — |  |  | 1,731 |  |  | — |
Corporate debt securities | 5,726 |  |  | — |  |  | 5,625 |  |  | 101 |
Total debt securities | 14,254 |  |  | — |  |  | 14,153 |  |  | 101 |
Common stock | 7 |  |  | 7 |  |  | — |  |  | — |
Total invested assets | $ | 19,093 |  |  | $ | 4,839 |  |  | $ | 14,153 |  |  | $ | 101 |
December 31, 2021 |  |  |  |  |  |  |
Cash equivalents | $ | 3,322 |  |  | $ | 3,322 |  |  | $ | — |  |  | $ | — |
Debt securities: |  |  |  |  |  |  |
U.S. Treasury and other U.S. government corporations and agencies: |  |  |  |  |  |  |
U.S. Treasury and agency obligations | 602 |  |  | — |  |  | 602 |  |  | — |
Mortgage-backed securities | 3,229 |  |  | — |  |  | 3,229 |  |  | — |
Tax-exempt municipal securities | 841 |  |  | — |  |  | 841 |  |  | — |
Mortgage-backed securities: |  |  |  |  |  |  |
Residential | 367 |  |  | — |  |  | 367 |  |  | — |
Commercial | 1,410 |  |  | — |  |  | 1,410 |  |  | — |
Asset-backed securities | 1,348 |  |  | — |  |  | 1,348 |  |  | — |
Corporate debt securities | 5,700 |  |  | — |  |  | 5,632 |  |  | 68 |
Total debt securities | 13,497 |  |  | — |  |  | 13,429 |  |  | 68 |
Common stock | 475 |  |  | 475 |  |  | — |  |  | — |
Total invested assets | $ | 17,294 |  |  | $ | 3,797 |  |  | $ | 13,429 |  |  | $ | 68 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation | During the years ended December 31, 2022 and 2021, the changes in the fair value of the assets measured using significant unobservable inputs (Level 3) were comprised of the following:
| For the year ended December 31, 2022 | For the year ended December 31, 2021 |  |  |  |
| Private Placements |  |  |  |
| (in millions)
Beginning balance at January 1 | $ | 68 |  | $ | — |  |  |  |  |
Total gains or losses: |  |  |  |  |  |
Realized in earnings | — |  | — |  |  |  |  |
Unrealized in other comprehensive income | (14) |  | (1) |  |  |  |  |
Purchases | 47 |  | 69 |  |  |  |  |
Sales | — |  | — |  |  |  |  |
Settlements | — |  | — |  |  |  |  |
Balance at December 31 | $ | 101 |  | $ | 68 |  |  |  |  |
Schedule of Assumptions Used For Inputs In Fair Value Measurement | The table below presents the assumptions used for December 31, 2022 and 2021, respectively:
| December 31, 2022 | December 31, 2021 |  |  |
Annualized volatility | 16.7% - 20.8% | 22.4 | % |  |  |
Credit spread | 1.3% - 1.5% | 0.9 | % |  |  |
Revenue exit multiple | 1.5x - 2.5x | 1.5x - 2.5x |  |  |
Weighted average cost of capital | 11.5% - 12.5% | 12.5 | % |  |  |
Long term growth rate | 3.0 | % | 3.0 | % |  |  |
The assumptions used for annualized volatility, credit spread and weighted average cost of capital reflect the lowest and highest values where they differ significantly across the series of put and call options due to their expected exercise dates.

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19279-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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