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Reserve for Life-Contingent Contract Benefits and Contractholder Funds - Reserve for life-contingent contract benefits (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reserve for life-contingent benefits: |  |  |  |
Total reserve for life-contingent contract benefits |  | $ 12,768 | $ 12,300 |
Key assumptions generally used in calculating the reserve for life-contingent contract benefits: |  |  |  |
Premium deficiency reserve |  | 496 | 126 |
Allstate Annuities |  |  |  |
Key assumptions generally used in calculating the reserve for life-contingent contract benefits: |  |  |  |
Premium deficiency for immediate annuities, after tax |  | (178) | 0 | $ 0
Structured settlement annuities |  |  |  |
Reserve for life-contingent benefits: |  |  |  |
Total reserve for life-contingent contract benefits |  | $ 7,407 | 6,840 |
Structured settlement annuities | Minimum |  |  |  |
Key assumptions generally used in calculating the reserve for life-contingent contract benefits: |  |  |  |
Life contingent contract benefits, interest rate assumptions (as a percent) |  | 4.70% |  |
Other immediate fixed annuities |  |  |  |
Reserve for life-contingent benefits: |  |  |  |
Total reserve for life-contingent contract benefits |  | $ 1,511 | 1,612 |
Other immediate fixed annuities | Minimum |  |  |  |
Key assumptions generally used in calculating the reserve for life-contingent contract benefits: |  |  |  |
Life contingent contract benefits, interest rate assumptions (as a percent) |  | 4.70% |  |
Traditional life insurance |  |  |  |
Reserve for life-contingent benefits: |  |  |  |
Total reserve for life-contingent contract benefits |  | $ 2,942 | 2,897 |
Traditional life insurance | Minimum |  |  |  |
Key assumptions generally used in calculating the reserve for life-contingent contract benefits: |  |  |  |
Life contingent contract benefits, interest rate assumptions (as a percent) |  | 2.50% |  |
Traditional life insurance | Maximum |  |  |  |
Key assumptions generally used in calculating the reserve for life-contingent contract benefits: |  |  |  |
Life contingent contract benefits, interest rate assumptions (as a percent) |  | 11.30% |  |
Accident and health insurance |  |  |  |
Reserve for life-contingent benefits: |  |  |  |
Total reserve for life-contingent contract benefits |  | $ 841 | 873 |
Accident and health insurance | Minimum |  |  |  |
Key assumptions generally used in calculating the reserve for life-contingent contract benefits: |  |  |  |
Life contingent contract benefits, interest rate assumptions (as a percent) |  | 3.00% |  |
Accident and health insurance | Maximum |  |  |  |
Key assumptions generally used in calculating the reserve for life-contingent contract benefits: |  |  |  |
Life contingent contract benefits, interest rate assumptions (as a percent) |  | 7.00% |  |
Other |  |  |  |
Reserve for life-contingent benefits: |  |  |  |
Total reserve for life-contingent contract benefits |  | $ 67 | $ 78 |
Other | Minimum |  |  |  |
Key assumptions generally used in calculating the reserve for life-contingent contract benefits: |  |  |  |
Life contingent contract benefits, interest rate assumptions (as a percent) |  | 1.40% |  |
Other | Maximum |  |  |  |
Key assumptions generally used in calculating the reserve for life-contingent contract benefits: |  |  |  |
Life contingent contract benefits, interest rate assumptions (as a percent) |  | 5.80% |  |
Reinsurance ceded | Allstate Annuities |  |  |  |
Key assumptions generally used in calculating the reserve for life-contingent contract benefits: |  |  |  |
Premium deficiency for immediate annuities, after tax | $ 225 |  |  |

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- Definition Insurance reserve adjustment included in accumulated other comprehensive income (loss) which represents the amount by which the reserve balance would increase if the net unrealized gains in the applicable product portfolios were realized and reinvested at current lower interest rates, resulting in a premium deficiency. + References No definition available. + Details
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- Definition Interest rate in the range of interest rates used to calculate future benefits to be paid to or on behalf of policyholders and related expenses less the present value of future net premiums using assumptions such as estimates of expected investment yields, mortality, morbidity, terminations and expenses, applicable at the time the insurance contracts are made and cost of settling insured claims and cost incurred in the claim settlement process. + References No definition available. + Details
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- Definition Amount, before effect of reinsurance, of present value of future benefit to be paid to or on behalf of policyholder and related expense less present value of future net premium receivable under insurance contract. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121643868&loc=d3e14931-158439 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 29E -URI http://asc.fasb.org/extlink&oid=121639165&loc=SL117819541-158441 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(13)(a)(1)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121643868&loc=d3e14931-158439 + Details
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