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Schedule II - Condensed Financial Information of Registrant - Cash Flows (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 15, 2020 | Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities |  |  |  |  |
Net income |  |  | $ 5,576 | $ 4,847 | $ 2,160
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |
Realized capital gains (losses) |  | $ (4) | (1,356) | (1,885) | 877
Pension and other postretirement remeasurement (gains) losses |  |  | 51 | (114) | (468)
Changes in: |  |  |  |  |
Net cash provided by operating activities |  |  | 5,491 | 5,129 | 5,175
Cash flows from investing activities |  |  |  |  |
Change in short-term and other investments, net |  |  | (3,871) | (725) | (603)
Net cash used in investing activities |  |  | (3,441) | (2,807) | (1,719)
Cash flows from financing activities |  |  |  |  |
Proceeds from issuance of long-term debt |  |  | 1,189 | 491 | 498
Redemption of preferred stock | $ (288) |  |  |  |
Redemption and repayment of long-term debt |  |  | 0 | (317) | (400)
Proceeds from issuance of preferred stock |  |  | 0 | 1,414 | 557
Dividends paid on common stock |  |  | (668) | (653) | (614)
Dividends paid on preferred stock |  |  | (108) | (134) | (134)
Treasury stock purchases |  |  | (1,737) | (1,735) | (2,303)
Shares reissued under equity incentive plans, net |  |  | 63 | 120 | 73
Other |  |  | 41 | 129 | 91
Net cash used in financing activities |  |  | (2,011) | (2,483) | (3,574)
Cash at beginning of year |  |  | 338 |  |
Cash at end of year |  | 377 | 377 | 338 |
Allstate Corporation |  |  |  |  |
Cash flows from operating activities |  |  |  |  |
Net income |  |  | 5,576 | 4,847 | 2,160
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |
Equity in net income of subsidiaries |  |  | (5,665) | (5,072) | (2,731)
Dividends received from subsidiaries |  |  | 4,157 | 2,434 | 2,059
Realized capital gains (losses) |  |  | (33) | (9) | 10
Pension and other postretirement remeasurement (gains) losses |  |  | (73) | 103 | 454
Changes in: |  |  |  |  |
Pension and other postretirement benefits |  |  | (168) | (122) | (116)
Income taxes |  |  | 54 | 13 | (28)
Operating assets and liabilities |  |  | 110 | 111 | 160
Net cash provided by operating activities |  |  | 3,958 | 2,305 | 1,968
Cash flows from investing activities |  |  |  |  |
Proceeds from sales of investments |  |  | 1,251 | 1,094 | 1,370
Proceeds from sales of investments to subsidiaries |  |  | 0 | 0 | 390
Investment purchases |  |  | (402) | (892) | (1,037)
Investment collections |  |  | 16 | 65 | 108
Capital contribution or return of capital from subsidiaries |  |  | 251 | 43 | (975)
Change in short-term and other investments, net |  |  | (3,777) | (417) | (115)
Net cash used in investing activities |  |  | (2,661) | (107) | (259)
Cash flows from financing activities |  |  |  |  |
Proceeds from borrowings from subsidiaries |  |  | 1,250 | 1,000 | 1,250
Repayment of notes due to subsidiaries |  |  | (1,000) | (1,250) | (250)
Proceeds from issuance of long-term debt |  |  | 1,189 | 491 | 498
Redemption of preferred stock |  |  | (288) | (1,132) | (385)
Redemption and repayment of long-term debt |  |  | 0 | (317) | (400)
Proceeds from issuance of preferred stock |  |  | 0 | 1,414 | 557
Dividends paid on common stock |  |  | (668) | (653) | (614)
Dividends paid on preferred stock |  |  | (108) | (134) | (134)
Treasury stock purchases |  |  | (1,737) | (1,735) | (2,303)
Shares reissued under equity incentive plans, net |  |  | 63 | 120 | 73
Other |  |  | 0 | 0 | (1)
Net cash used in financing activities |  |  | (1,299) | (2,196) | (1,709)
Net (decrease) increase in cash |  |  | (2) | 2 | 0
Cash at beginning of year |  |  | 2 | 0 | 0
Cash at end of year |  | $ 0 | $ 0 | $ 2 | $ 0

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- Definition Amount of cash inflow from issuance of shares under share-based payment arrangement. Includes, but is not limited to, option exercised. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow (outflow) from financing activities classified as other. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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- Definition The cash inflow from a long-term borrowing made from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Proceeds from Advances from Affiliates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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