Purchase Of Shares, Amount Purchased, Nominal Value Purchase Of Shares, Amount Purchased, Nominal Value Equity attributable to shareholders' Equity attributable to shareholders' Change In Investment Contract Provisions Change In Investment Contract Provisions Premiums Ceded To Reinsurers Premiums Ceded To Reinsurers ifrs-full_Premiums​Written​Net​Of​Reinsurance Tax Attributable To Policyholders' Returns Tax Attributable To Policyholders' Returns avi_NetRepaymentDrawdownOfBorrowings Net (Repayment)/Drawdown Of Borrowings Net (Repayment)/Drawdown Of Borrowings Cash Flow On Disposals From Discontinued Operations Cash Flow On Disposals From Discontinued Operations Tax Attributable To Shareholders' Profits Tax Attributable To Shareholders' Profits Purchase Of Shares, Amount Authorized To Be Purchased Purchase Of Shares, Amount Authorized To Be Purchased Description of accounting policy for other income [Text Block] Description of accounting policy for other income Change In Unallocated Divisible Surplus Change In Unallocated Divisible Surplus Description of accounting policy for Insurance Product Classification [Text Block] Description of accounting policy for Insurance Product Classification Reserves Credit For Equity Compensation Plans Reserves Credit For Equity Compensation Plans Loans Loans Description of accounting policy for insurance business [Text Block] Description of accounting policy for insurance business Preference Dividends Paid Preference Dividends Paid Streamlined energy and carbon reporting Streamlined energy and carbon reporting Revenue (Loss) Revenue (Loss) Unallocated Divisible Surplus Unallocated Divisible Surplus ifrs-full_Profit​Loss​From​Discontinued​Operations Other reserves ifrs-full_Increase​Decrease​In​Cash​And​Cash​Equivalents​Discontinued​Operations Disclosure of Pension Deficits And Other Provisions [Text Block] Disclosure of Pension Deficits And Other Provisions Investment Expense Attributable To Unitholders Investment Expense Attributable To Unitholders Net Asset Value Attributable To Unitholders Net Asset Value Attributable To Unitholders Shares Purchased In Buyback Shares Purchased In Buyback Shares Purchased In Buyback Description of accounting policy for investment contract [Text Block] Description of accounting policy for investment contract Description of accounting policy for fiduciary activities [Text Block] Description of accounting policy for fiduciary activities Income (Expenses), by nature Income (Expenses), by nature Income (Expenses), by nature Payments For Distributions To Shareholders Payments For Distributions To Shareholders Payments For Distributions To Shareholders ifrs-full_Cash​And​Cash​Equivalents​If​Different​From​Statement​Of​Financial​Position ifrs-full_Cash​And​Cash​Equivalents​If​Different​From​Statement​Of​Financial​Position Return of capital to ordinary shares Return of capital to ordinary shareholders Return of capital to ordinary shareholders ifrs-full_Cash​Flows​From​Used​In​Operating​Activities Pension Deficits And Other Provisions Pension Deficits And Other Provisions Subordinated Debt And Senior Notes [Member] Subordinated Debt And Senior Notes avi_ProfitBeforeTaxAttributableToShareholdersProfitsFromContinuingOperations Profit Before Tax Attributable To Shareholders' Profits From Continuing Operations Profit Before Tax Attributable To Shareholders' Profits From Continuing Operations ifrs-full_Capital​Reserve ifrs-full_Increase​Decrease​In​Cash​And​Cash​Equivalents​Before​Effect​Of​Exchange​Rate​Changes ifrs-full_Net​Earned​Premium ifrs-full_Cash​Flows​From​Used​In​Investing​Activities Prepayments and other accrued income Prepayments and other accrued income Cash Flows (Used In)/From Discontinued Operations Cash Flows (Used In)/From Discontinued Operations Capital Reserves [Member] Capital Reserves Foreign exchange gain (loss) Profit For The Year From Discontinued Operations Profit For The Year From Discontinued Operations Convertible Notes [Member] Convertible Notes Coupon Payments On Borrowings Coupon Payments On Notes Coupon Payments On Notes Investment Income (Expense) Investment Income (Expense) Direct Capital Instrument [Member] Direct Capital Instrument Purchase Of Shares, Amount Purchased Purchase Of Shares, Amount Purchased ifrs-full_Cash​Flows​From​Used​In​Financing​Activities Description of accounting policy for financial investments [Text Block] Description of accounting policy for financial investments Treasury Shares Purchased For Employee Trusts Treasury Shares Purchased For Employee Trusts