Schedule V - Supplemental Information (for Property-Casualty Insurance Operations)	12 Months Ended
Mar. 31, 2022
Disclosure Text Block [Abstract]
Schedule Of Supplemental Information For Property Casualty Insurance Underwriters [Text Block]	SCHEDULE V AMERCO AND CONSOLIDATED SUBSIDIARIES SUPPLEMENTAL INFORMATION (FOR PROPERTY-CASUALTY INSURANCE Operations) Years Ended December 31, 2021, 2020, AND 2019 Fiscal Year Affiliation with Registrant Deferred Policy Acquisition Cost Reserves for Unpaid Claims and Adjustment Expenses Discount if any, Deducted Unearned Premiums Net Earned Premiums (1) Net Investment Income (2) Claim and Claim Adjustment Expenses Incurred Related to Current Year Claim and Claim Adjustment Expenses Incurred Related to Prior Year Amortization of Deferred Policy Acquisition Costs Paid Claims and Claim Adjustment Expense Net Premiums Written (1) (In thousands) 2022 Consolidated property casualty entity $ – $ 159,162 $ – 334 $ 89,667 $ 24,385 $ 28,980 $ (6,290) $ – $ 24,012 $ 90,002 2021 Consolidated property casualty entity – 177,963 – (294) 70,285 16,335 20,670 (3,865) – 25,759 69,989 2020 Consolidated property casualty entity – 209,127 – 233 69,141 19,926 22,137 (9,535) – 24,608 66,277 (1)The earned and written premiums are reported net of intersegment transactions. There were $ 3.1 million, $ 1.5 million and $ 3.1 million in written premiums and $ 2.8 million, $ 1.8 million and $ 2.8 million in earned premiums eliminated for the years ended December 31, 2021, 2020 and 2019, respectively. (2) Net Investment Income excludes net realized (gains) losses on investments of ($1.0) million, ($0.1) million and ($0.4) million for the years ended December 31, 2021, 2020 and 2019, respectively.

Schedule V - Supplemental Information (for Property-Casualty Insurance Operations)

12 Months Ended

Mar. 31, 2022

Schedule Of Supplemental Information For Property Casualty Insurance Underwriters [Text Block]

SCHEDULE V AMERCO AND CONSOLIDATED SUBSIDIARIES SUPPLEMENTAL INFORMATION (FOR PROPERTY-CASUALTY INSURANCE Operations) Years Ended December 31, 2021, 2020, AND 2019 Fiscal Year Affiliation with Registrant Deferred Policy Acquisition Cost Reserves for Unpaid Claims and Adjustment Expenses Discount if any, Deducted Unearned Premiums Net Earned Premiums (1) Net Investment Income (2) Claim and Claim Adjustment Expenses Incurred Related to Current Year Claim and Claim Adjustment Expenses Incurred Related to Prior Year Amortization of Deferred Policy Acquisition Costs Paid Claims and Claim Adjustment Expense Net Premiums Written (1) (In thousands) 2022 Consolidated property casualty entity $ – $ 159,162 $ – 334 $ 89,667 $ 24,385 $ 28,980 $ (6,290) $ – $ 24,012 $ 90,002 2021 Consolidated property casualty entity – 177,963 – (294) 70,285 16,335 20,670 (3,865) – 25,759 69,989 2020 Consolidated property casualty entity – 209,127 – 233 69,141 19,926 22,137 (9,535) – 24,608 66,277 (1)The earned and written premiums are reported net of intersegment transactions. There were $ 3.1 million, $ 1.5 million and $ 3.1 million in written premiums and $ 2.8 million, $ 1.8 million and $ 2.8 million in earned premiums eliminated for the years ended December 31, 2021, 2020 and 2019, respectively. (2) Net Investment Income excludes net realized (gains) losses on investments of ($1.0) million, ($0.1) million and ($0.4) million for the years ended December 31, 2021, 2020 and 2019, respectively.