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Fair Value Measurements - Schedule of Change in Restricted Investments Valued Using Level 3 Inputs (Details) - Level 3 - Fair Value Recurring Basis - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Other Liabilities |  |
Fair Value, Liabilities |  |
Fair value of investment and liabilities, beginning balance | $ 0 | $ 0
Value of additional investment received |  | 2
Released from restrictions | 0 | (4)
Unrealized gain |  | 2
Change in fair value | 0 |
Fair value of investment and liabilities, ending balance | 0 | 0
Restricted Investments |  |
Fair Value, Assets |  |
Fair value of investment and liabilities, beginning balance | 44 | 29
Value of additional investment received |  | 5
Released from restrictions | 51 | (8)
Unrealized gain |  | 18
Change in fair value | 7 |
Fair value of investment and liabilities, ending balance | $ 0 | $ 44

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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis liability non-cash consideration. + References No definition available. + Details
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- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Amount of unrealized gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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