Financial Instruments	9 Months Ended
Sep. 30, 2022
Financial Instruments [Abstract]
Financial Instruments	14. Financial Instruments Seller Earnouts Upon completion of the Business Combination, the equity owners of Alight Holdings received an earnout in the form of non-voting shares of Class B-1 and Class B-2 Common Stock, which automatically convert into Class A Common Stock if, at any time during the seven years following the Closing Date certain criteria are achieved. See Note 9 “Stockholders’ and Members’ Equity” for additional information regarding the Seller Earnouts. The portion of the Seller Earnouts related to employee compensation is accounted for as share-based compensation. See Note 10 “Share-Based Compensation Expense” for additional information. In addition, a portion of the Seller Earnouts relates to Class Z instruments that were forfeited by individual equityholders and will be re-allocated to the holders of unvested management equity upon the ultimate vesting date. See Note 9 “Stockholders’ and Members’ Equity” for additional information regarding the Class Z instruments. This portion of Seller Earnouts is accounted for as a contingent consideration liability recorded at the fair value on the individual forfeiture date. These instruments are not subject to remeasurement at each balance sheet date. As of September 30, 2022, the balance for this portion of the Seller Earnouts was $1 million, offset in Loss (Gain) from change in fair value of financial instruments in the Condensed Consolidated Statements of Comprehensive Income (Loss). The majority of the Seller Earnouts, which are not related to employee compensation, are accounted for as a contingent consideration liability at fair value within Financial instruments on the Condensed Consolidated Balance Sheets because the Seller Earnouts do not meet the criteria for classification within equity. This portion of the Seller Earnouts are subject to remeasurement at each balance sheet date. At September 30, 2022 and December 31, 2021, the Seller Earnouts had a fair value of $81 million and $135 million, respectively. For the Successor three and nine months ended September 30, 2022, a loss of $10 million and a gain of $54 million, respectively, was recorded in Loss (Gain) from change in fair value of financial instruments in the Condensed Consolidated Statements of Comprehensive Income (Loss). The fair value of the Seller Earnouts is determined using Monte Carlo simulation and Option Pricing Methods (Level 3 inputs, see Note 16 "Fair Value Measurements"). Significant unobservable inputs are used in the assessment of fair value, including the following assumptions: volatility of 50%, risk-free interest rate of 4.03%, expected holding period of 5.76 years and probability assessments based on the likelihood of reaching the performance targets defined in the Business Combination. An increase in the risk-free interest rate or expected volatility would result in an increase in the fair value measurement of the Seller Earnouts and vice versa.

Financial Instruments

9 Months Ended

Sep. 30, 2022

14. Financial Instruments

Seller Earnouts

Upon completion of the Business Combination, the equity owners of Alight Holdings received an earnout in the form of non-voting shares of Class B-1 and Class B-2 Common Stock, which automatically convert into Class A Common Stock if, at any time during the seven years following the Closing Date certain criteria are achieved. See Note 9 “Stockholders’ and Members’ Equity” for additional information regarding the Seller Earnouts.

The portion of the Seller Earnouts related to employee compensation is accounted for as share-based compensation. See Note 10 “Share-Based Compensation Expense” for additional information.

In addition, a portion of the Seller Earnouts relates to Class Z instruments that were forfeited by individual equityholders and will be re-allocated to the holders of unvested management equity upon the ultimate vesting date. See Note 9 “Stockholders’ and Members’ Equity” for additional information regarding the Class Z instruments. This portion of Seller Earnouts is accounted for as a contingent consideration liability recorded at the fair value on the individual forfeiture date. These instruments are not subject to remeasurement at each balance sheet date. As of September 30, 2022, the balance for this portion of the Seller Earnouts was $1 million, offset in Loss (Gain) from change in fair value of financial instruments in the Condensed Consolidated Statements of Comprehensive Income (Loss).

The majority of the Seller Earnouts, which are not related to employee compensation, are accounted for as a contingent consideration liability at fair value within Financial instruments on the Condensed Consolidated Balance Sheets because the Seller Earnouts do not meet the criteria for classification within equity. This portion of the Seller Earnouts are subject to remeasurement at each balance sheet date. At September 30, 2022 and December 31, 2021, the Seller Earnouts had a fair value of $81 million and $135 million, respectively. For the Successor three and nine months ended September 30, 2022, a loss of $10 million and a gain of $54 million, respectively, was recorded in Loss (Gain) from change in fair value of financial instruments in the Condensed Consolidated Statements of Comprehensive Income (Loss).

The fair value of the Seller Earnouts is determined using Monte Carlo simulation and Option Pricing Methods (Level 3 inputs, see Note 16 "Fair Value Measurements"). Significant unobservable inputs are used in the assessment of fair value, including the following assumptions: volatility of 50%, risk-free interest rate of 4.03%, expected holding period of 5.76 years and probability assessments based on the likelihood of reaching the performance targets defined in the Business Combination. An increase in the risk-free interest rate or expected volatility would result in an increase in the fair value measurement of the Seller Earnouts and vice versa.