The defined benefit pension plan of Best Value Transport included the following balance at January 1, 2021 (S in millions): Projected benefit obligation at January 1, 2021 $840 Plan assets at fair value at January 1, 2021 $750 Prior service cost--AOCI at January 1, 2021 $30 Net gain---AOCI 594 Information regarding the defined-benefit pension plan of Best Value Transport included the following for 2021 ($ in millions): Service cost $50 Interest cost $12 S18 Gain from change in actuarial estimates in PBO Retiree benefits paid (end of year) $60 $25 $27 $80 Actual return on plan assets Expected return on plan assets Employer's cash contribution (end of year) Amortization of prior seryice costs...AOCI Amortization of net gain-AOCI S3 $1 What is the balance of net gain---AOCI at December 31, 2021? De not add dollar sign: do not add comma by yourself to your amount; round the answer to the whole number, enter your answer in millions)