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Pay vs Performance Disclosure - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Pay vs Performance Disclosure [Table] |  |  |
Pay vs Performance [Table Text Block] | Pay Versus Performance Table As required by the SEC rules and aligned with Item 402(v) of Regulation S-K, detail is provided in the pay versus performance table. The table represents the relationship between our Principal Executive Officer (“PEO”) and Non-PEO NEOs compensation actually paid (“CAP”) with respect to key financial performance measures of the company. For additional information regarding Allstate’s pay for performance philosophy and how the company aligns NEO compensation, refer to the CD&A beginning on page 62.
|  |  | Summary |  |  |  |  |  | Average Summary |  |  | Average |  |  | Value of Initial Fixed $100 Investment Based On: |  |  |  |  |  |  |
Year |  |  | Compensation Table Total for PEO ($)(1) |  |  | Compensation Actually Paid to PEO ($)(2)(3) |  |  | Compensation Table Total for Non-PEO NEOs ($)(1) |  |  | Compensation Actually Paid to Non-PEO NEOs ($)(2)(3) |  |  | Total Shareholder Return ($) |  |  | Peer Group Total Shareholder Return ($) |  |  | Net Income ($ in millions) |  |  | Performance Net Income ($ in millions)(4) |
2022 |  |  |  | 15,005,001 |  |  |  | 30,035,131 |  |  |  | 3,498,306 |  |  |  | 4,852,665 |  |  |  | 130 |  |  |  | 149 |  |  |  | (1,416) |  |  |  | (426) |
2021 |  |  |  | 19,066,920 |  |  |  | 27,585,626 |  |  |  | 5,548,209 |  |  |  | 7,666,840 |  |  |  | 110 |  |  |  | 131 |  |  |  | 1,485 |  |  |  | 3,689 |
2020 |  |  |  | 21,126,386 |  |  |  | 26,023,346 |  |  |  | 5,228,904 |  |  |  | 6,270,236 |  |  |  | 100 |  |  |  | 101 |  |  |  | 5,461 |  |  |  | 4,967 |
Company Selected Measure Name | Performance Net Income |  |
Named Executive Officers, Footnote [Text Block] |
(1) | The totals reflected align with the data reported in the Summary Compensation Table as shown on page 87. Mr. Wilson (Chair, President, and CEO) is represented as the Principal Executive Officer (“PEO”) for each year reported. The Non-PEO NEO column represents Allstate’s NEOs for each respective year. The employees included in Non-PEO NEOs for each year are noted below:
| 2022 |  | 2021 |  | 2020
| Mario Rizzo |  | Mario Rizzo |  | Mario Rizzo
| Glenn Shapiro |  | Glenn Shapiro |  | Glenn Shapiro
| Don Civgin |  | Don Civgin |  | Don Civgin
| John Dugenske |  | John Dugenske |  | John Dugenske
| Jesse Merten |  |  |  |
| Suren Gupta |  |  |  |
| Robert Toohey |  |  |  |
PEO Total Compensation Amount | $ 15,005,001 | $ 19,066,920 | $ 21,126,386
PEO Actually Paid Compensation Amount | $ 30,035,131 | 27,585,626 | 26,023,346
Adjustment To PEO Compensation, Footnote [Text Block] |
(2) | CAP has been calculated in accordance with Item 402(v) of Regulation S-K. The amounts do not reflect actual amount of compensation earned, realized, or received by the company NEOs. These amounts reflect the Summary Compensation Table Total with certain adjustments as described below. The calculation of CAP requires adjustments to amounts previously reported in the Summary Compensation Table for the years represented. The adjustments made to the PEO and Non-PEO NEOs to determine fair value is noted in the table below.
|  |  |  |  |  | 2020 |  |  | 2021 |  |  | 2022 |
| Compensation Actually Paid Component |  | PEO |  | Non-PEO |  | PEO |  | Non-PEO |  | PEO |  | Non-PEO
| Summary Compensation Table (SCT) Total |  | $ | 21,126,386 |  |  | $ | 5,228,904 |  |  | $ | 19,066,920 |  |  | $ | 5,548,209 |  |  | $ | 15,005,001 |  |  | $ | 3,498,306 |
| Deduction: |  |  | SCT change in Actuarial Value of Pension Value |  | $ | (3,116,842 | ) |  | $ | (189,278 | ) |  | $ | (697,929 | ) |  | $ | (65,931 | ) |  | $ | - |  |  | $ | (51,781 | )
| Deduction: |  |  | SCT Stock Award Amount |  | $ | (7,312,094 | ) |  | $ | (1,685,460 | ) |  | $ | (6,335,804 | ) |  | $ | (1,617,742 | ) |  | $ | (6,868,175 | ) |  | $ | (1,523,242 | )
| Deduction: |  |  | SCT Option Award Amount |  | $ | (4,404,993 | ) |  | $ | (1,015,376 | ) |  | $ | (4,304,994 | ) |  | $ | (1,099,217 | ) |  | $ | (4,293,494 | ) |  | $ | (871,876 | )
| Addition: |  |  | Pension Service Cost |  | $ | 217,343 |  |  | $ | 56,961 |  |  | $ | 238,310 |  |  | $ | 62,348 |  |  | $ | 235,050 |  |  | $ | 46,723 |
| Addition: |  |  | Change in fair value, during the fiscal year, of unvested equity awards at the beginning of the fiscal year that vested during the fiscal year |  | $ | 3,712,366 |  |  | $ | 218,942 |  |  | $ | (454,767 | ) |  | $ | (110,761 | ) |  | $ | 3,039,030 |  |  | $ | 521,581 |
| Addition: |  |  | Change in fair value, during the fiscal year, of unvested equity awards at the beginning of the fiscal year that remained unvested at year-end |  | $ | 6,802,340 |  |  | $ | 1,581,275 |  |  | $ | 6,922,985 |  |  | $ | 1,592,057 |  |  | $ | 7,695,232 |  |  | $ | 1,338,444 |
| Addition: |  |  | Fair value, at the end of the year, of equity awards granted during the fiscal year that remain unvested at year-end |  | $ | 8,998,841 |  |  | $ | 2,074,267 |  |  | $ | 13,150,905 |  |  | $ | 3,357,877 |  |  | $ | 15,222,487 |  |  | $ | 2,083,563 |
| Deduction: |  |  | Fair value of unvested equity awards at the beginning of the fiscal year that were forfeiture during the fiscal year |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | (189,054 | )
| Compensation Actually Paid |  | $ | 26,023,346 |  |  | $ | 6,270,236 |  |  | $ | 27,585,626 |  |  | $ | 7,666,840 |  |  | $ | 30,035,131 |  |  | $ | 4,852,665 |
Non-PEO NEO Average Total Compensation Amount | $ 3,498,306 | 5,548,209 | 5,228,904
Non-PEO NEO Average Compensation Actually Paid Amount | $ 4,852,665 | 7,666,840 | 6,270,236
Adjustment to Non-PEO NEO Compensation Footnote [Text Block] |
(2) | CAP has been calculated in accordance with Item 402(v) of Regulation S-K. The amounts do not reflect actual amount of compensation earned, realized, or received by the company NEOs. These amounts reflect the Summary Compensation Table Total with certain adjustments as described below. The calculation of CAP requires adjustments to amounts previously reported in the Summary Compensation Table for the years represented. The adjustments made to the PEO and Non-PEO NEOs to determine fair value is noted in the table below.
|  |  |  |  |  | 2020 |  |  | 2021 |  |  | 2022 |
| Compensation Actually Paid Component |  | PEO |  | Non-PEO |  | PEO |  | Non-PEO |  | PEO |  | Non-PEO
| Summary Compensation Table (SCT) Total |  | $ | 21,126,386 |  |  | $ | 5,228,904 |  |  | $ | 19,066,920 |  |  | $ | 5,548,209 |  |  | $ | 15,005,001 |  |  | $ | 3,498,306 |
| Deduction: |  |  | SCT change in Actuarial Value of Pension Value |  | $ | (3,116,842 | ) |  | $ | (189,278 | ) |  | $ | (697,929 | ) |  | $ | (65,931 | ) |  | $ | - |  |  | $ | (51,781 | )
| Deduction: |  |  | SCT Stock Award Amount |  | $ | (7,312,094 | ) |  | $ | (1,685,460 | ) |  | $ | (6,335,804 | ) |  | $ | (1,617,742 | ) |  | $ | (6,868,175 | ) |  | $ | (1,523,242 | )
| Deduction: |  |  | SCT Option Award Amount |  | $ | (4,404,993 | ) |  | $ | (1,015,376 | ) |  | $ | (4,304,994 | ) |  | $ | (1,099,217 | ) |  | $ | (4,293,494 | ) |  | $ | (871,876 | )
| Addition: |  |  | Pension Service Cost |  | $ | 217,343 |  |  | $ | 56,961 |  |  | $ | 238,310 |  |  | $ | 62,348 |  |  | $ | 235,050 |  |  | $ | 46,723 |
| Addition: |  |  | Change in fair value, during the fiscal year, of unvested equity awards at the beginning of the fiscal year that vested during the fiscal year |  | $ | 3,712,366 |  |  | $ | 218,942 |  |  | $ | (454,767 | ) |  | $ | (110,761 | ) |  | $ | 3,039,030 |  |  | $ | 521,581 |
| Addition: |  |  | Change in fair value, during the fiscal year, of unvested equity awards at the beginning of the fiscal year that remained unvested at year-end |  | $ | 6,802,340 |  |  | $ | 1,581,275 |  |  | $ | 6,922,985 |  |  | $ | 1,592,057 |  |  | $ | 7,695,232 |  |  | $ | 1,338,444 |
| Addition: |  |  | Fair value, at the end of the year, of equity awards granted during the fiscal year that remain unvested at year-end |  | $ | 8,998,841 |  |  | $ | 2,074,267 |  |  | $ | 13,150,905 |  |  | $ | 3,357,877 |  |  | $ | 15,222,487 |  |  | $ | 2,083,563 |
| Deduction: |  |  | Fair value of unvested equity awards at the beginning of the fiscal year that were forfeiture during the fiscal year |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | (189,054 | )
| Compensation Actually Paid |  | $ | 26,023,346 |  |  | $ | 6,270,236 |  |  | $ | 27,585,626 |  |  | $ | 7,666,840 |  |  | $ | 30,035,131 |  |  | $ | 4,852,665 |
Compensation Actually Paid vs. Total Shareholder Return [Text Block] |
CAP vs Total Shareholder Return
Compensation Actually Paid vs. Net Income [Text Block] |
CAP vs Net Income
Compensation Actually Paid vs. Company Selected Measure [Text Block] |
| CAP vs Performance Net Income
Tabular List [Table Text Block] | Financial Measures: The Allstate executive compensation programs reflect the pay-for-performance culture and supports shareholder alignment while also incentivizing our executives as noted throughout the CD&A beginning on page 62. For the annual and long-term incentive programs, the committee uses performance measures that (1) align with the company’s strategy, operating principles and priorities, and shareholder interest, (2) support the achievement of corporate goals, and (3) reflect the company’s overall performance. The most important performance measures used to understand CAP with respect to company’s performance for Allstate NEOs for this most recently completed fiscal year are as follows:
Performance Net Income (PNI)
Performance Net Income Return on Equity (PNI ROE)
Total Premiums
Relative Total Shareholder Return (TSR)
Total Shareholder Return Amount | $ 130 | 110 | 100
Peer Group Total Shareholder Return Amount | 149 | 131 | 101
Net Income (Loss) Attributable to Parent | $ (1,416,000,000) | $ 1,485,000,000 | $ 5,461,000,000
Company Selected Measure Amount | (426,000,000) | 3,689,000,000 | 4,967,000,000
PEO Name | Mr. Wilson |  |
Measure [Axis]: 1 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Performance Net Income |  |
Non-GAAP Measure Description [Text Block] | Performance Net Income (PNI) is Allstate’s company selected measure. PNI is equal to net income applicable to common shareholders as reported in The Allstate Corporate Annual Report on Form 10-K adjusted for the after-tax items indicated on page 101 under Performance Net Income. |  |
Measure [Axis]: 2 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Performance Net Income Return on Equity |  |
Measure [Axis]: 3 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Total Premiums |  |
Measure [Axis]: 4 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Relative Total Shareholder Return |  |
P E O Deduction S C T Change In Actuarial Value Of Pension Value [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | $ 0 | $ (697,929) | $ (3,116,842)
Non P E O Deduction S C T Change In Actuarial Value Of Pension Value [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (51,781) | (65,931) | (189,278)
P E O Deduction S C T Stock Award Amount [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (6,868,175) | (6,335,804) | (7,312,094)
Non P E O Deduction S C T Option Award Amount [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (1,523,242) | (1,617,742) | (1,685,460)
P E O S C T Option Award Amount [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (4,293,494) | (4,304,994) | (4,404,993)
Non P E O S C T Option Award Amount [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (871,876) | (1,099,217) | (1,015,376)
P E O Addition Pension Service Cost [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 235,050 | 238,310 | 217,343
Non P E O Addition Pension Service Cost [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 46,723 | 62,348 | 56,961
P E O Addition Change In Fair Value During The Fiscal Year Of Unvested Equity Awards At The Beginning Of The Fiscal Year That Vested During The Fiscal Year [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 3,039,030 | (454,767) | 3,712,366
Non P E O Addition Change In Fair Value During The Fiscal Year Of Unvested Equity Awards At The Beginning Of The Fiscal Year That Vested During The Fiscal Year [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 521,581 | (110,761) | 218,942
P E O Addition Change In Fair Value During The Fiscal Year Of Unvested Equity Awards At The Beginning Of The Fiscal Year That Remained Unvested At Year End [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 7,695,232 | 6,922,985 | 6,802,340
Non P E O Addition Change In Fair Value During The Fiscal Year Of Unvested Equity Awards At The Beginning Of The Fiscal Year That Remained Unvested At Year End [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 1,338,444 | 1,592,057 | 1,581,275
P E O Addition Fair Value At The End Of The Year Of Equity Awards Granted During The Fiscal Year That Remain Unvested At Year End [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 15,222,487 | 13,150,905 | 8,998,841
Non P E O Addition Fair Value At The End Of The Year Of Equity Awards Granted During The Fiscal Year That Remain Unvested At Year End [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 2,083,563 | 3,357,877 | 2,074,267
P E O Deduction Fair Value Of Unvested Equity Awards At The Beginning Of The Fiscal Year That Were Forfeiture During The Fiscal Year [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 0 | 0 | 0
Non P E O Deduction Fair Value Of Unvested Equity Awards At The Beginning Of The Fiscal Year That Were Forfeiture During The Fiscal Year [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | $ (189,054) | $ 0 | $ 0

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