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v3.19.3.a.u2

Summary of Significant Accounting Policies - Securities loaned and Recognition of premium revenues and contract charges, and related benefits and interest credited (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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 | $ 15,343 | $ 14,510 |
Valuation allowance for uncollectible premium installment receivables | 90 | 77 |
Present value of future profits | 39 | 45 |
Amortization expense of present value of future profits | 6 | $ 2 | $ 6
Allstate Protection |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Unearned premiums | 12,570 |  |
Service Businesses |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Unearned premiums | $ 2,760 |  |
Minimum |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
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 |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Period for amortization of DAC and DSI for interest-sensitive life, fixed annuities and other investment contracts | 30 years |  |
Personal Lines [Member] | 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 [Member] | 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 |  |
Interest-sensitive life insurance contract charges | Minimum |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
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 |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Period for amortization of DAC and DSI for interest-sensitive life, fixed annuities and other investment contracts | 20 years |  |
Protection Plans and Other Contracts [Member] | Minimum |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Period for amortization of DAC for property-liability insurance | 1 year |  |
Protection Plans and Other Contracts [Member] | Maximum |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Period for amortization of DAC for property-liability insurance | 5 years |  |

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