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v3.20.4

Summary of Significant Accounting Policies - Securities loaned and Recognition of premium revenues and contract charges, and related benefits and interest credited (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Securities loaned |  |  |
Cash collateral received as percentage of fair value of domestic securities loaned | 102.00% |  |
Cash collateral received as a percent of fair value of foreign securities loaned | 105.00% |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Unearned premiums | $ 15,949,000,000 | $ 15,343,000,000 |
Decrease in unearned premiums | (598,000,000) | (801,000,000) | $ (915,000,000)
Unearned premium, year one | 1,300,000,000 |  |
Unearned premium, year two | 861,000,000 |  |
Unearned premium, thereafter | 1,000,000,000.00 |  |
Premium Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | (91,000,000) |  |
Increase in the provision for credit losses | (223,000,000) |  |
Write-off of uncollectible premium installment receivable amounts | 161,000,000 |  |
Ending balance | (153,000,000) | (91,000,000) |
Present value of future profits | 25,000,000 | 39,000,000 |
Amortization expense of present value of future profits | 14,000,000 | 6,000,000 | $ 2,000,000
Allstate Protection |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Unearned premiums | 12,772,000,000 | 12,567,000,000 |
Protection Services |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Unearned premiums | 3,167,000,000 | 2,765,000,000 |
Allstate Protection and Protection Services |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Unearned premiums | $ 15,939,000,000 | 15,332,000,000 |
Minimum |  |  |
Premium Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Period for amortization of DAC and DSI for interest-sensitive life, fixed annuities and other investment contracts | 15 years |  |
Maximum |  |  |
Securities loaned |  |  |
Securities lending transactions length | 30 days |  |
Premium Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Period for amortization of DAC and DSI for interest-sensitive life, fixed annuities and other investment contracts | 30 years |  |
Personal Lines | Minimum |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Property and casualty insurance contract, terms | 6 months |  |
Period for amortization of DAC for property-liability insurance | 6 months |  |
Personal Lines | Maximum |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Property and casualty insurance contract, terms | 12 months |  |
Period for amortization of DAC for property-liability insurance | 12 months |  |
Protection Plans and Other Contracts | Minimum |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Period for amortization of DAC for property-liability insurance | 1 year |  |
Protection Plans and Other Contracts | Maximum |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Period for amortization of DAC for property-liability insurance | 5 years |  |
Interest-sensitive life insurance contract charges | Minimum |  |  |
Premium Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Period for amortization of DAC and DSI for interest-sensitive life, fixed annuities and other investment contracts | 10 years |  |
Interest-sensitive life insurance contract charges | Maximum |  |  |
Premium Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Period for amortization of DAC and DSI for interest-sensitive life, fixed annuities and other investment contracts | 20 years |  |
Property and casualty insurance premiums | Protection Services |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Decrease in unearned premiums | $ 1,110,000,000 | $ 996,000,000 |

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