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Schedule II - Condensed Financial Information of Registrant - Financial Position (Details) - USD ($) $ / shares in Units, $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Assets |  |  |  |
Fixed income securities | $ 66,354 | $ 59,044 |  |
Short-term investments | 7,800 | 4,256 |  |
Cash | 377 | 338 |  |
Total assets | 125,987 | 119,950 |  |
Liabilities |  |  |  |
Long-term debt | 7,825 | 6,631 |  |
Total liabilities | 95,770 | 93,952 |  |
Shareholders’ equity |  |  |  |
Preferred stock and additional capital paid-in, $1 par value, 25 million shares authorized, 81.0 thousand and 92.5 thousand shares issued and outstanding, $2,025 and $2,313 aggregate liquidation preference | 1,970 | 2,248 |  |
Common stock, $.01 par value, 2.0 billion shares authorized and 900 million issued, 304 million and 319 million shares outstanding | 9 | 9 |  |
Additional capital paid-in | 3,498 | 3,463 |  |
Retained income | 52,767 | 48,074 |  |
Treasury Stock, Value | (31,331) | (29,746) |  |
Accumulated other comprehensive income: |  |  |  |
Unrealized net capital gains and losses | 3,180 | 1,887 |  |
Unrealized foreign currency translation adjustments | (7) | (59) |  |
Unamortized pension and other postretirement prior service credit | 131 | 122 |  |
Total accumulated other comprehensive income | 3,304 | 1,950 |  |
Total shareholders’ equity | 30,217 | 25,998 | $ 21,312 |
Total liabilities and shareholders’ equity | 125,987 | 119,950 |  |
Additional balance sheet disclosures: |  |  |  |
Other short term Investments, amortized cost | $ 7,800 | $ 4,256 |  |
Preferred stock, par or stated value per share (in USD per share) | $ 1 | $ 1 |  |
Preferred stock, shares authorized (in shares) | 25,000,000 | 25,000,000 |  |
Preferred stock, shares issued (in shares) | 81,000 | 92,500 |  |
Preferred stock, shares outstanding (in shares) | 81,000.0 | 92,500 |  |
Preferred Stock, liquidation preference | $ 2,025 | $ 2,313 |  |
Common stock, par or stated value per share (in USD per share) | $ 0.01 | $ 0.01 |  |
Common stock, shares authorized (in shares) | 2,000,000,000.0 | 2,000,000,000.0 |  |
Common stock, shares, issued (in shares) | 900,000,000 | 900,000,000 |  |
Common stock, shares, outstanding (in shares) | 304,000,000 | 319,000,000 |  |
Treasury stock, shares (in shares) | 596,000,000 | 581,000,000 |  |
Allstate Corporation |  |  |  |
Assets |  |  |  |
Investments in subsidiaries | $ 35,603 | $ 33,428 |  |
Fixed income securities | 0 | 466 |  |
Short-term investments | 4,479 | 702 |  |
Cash | 0 | 2 | $ 0 | $ 0
Receivable from subsidiaries | 524 | 448 |  |
Deferred income taxes | 187 | 230 |  |
Other assets | 87 | 86 |  |
Total assets | 40,880 | 35,362 |  |
Liabilities |  |  |  |
Long-term debt | 7,825 | 6,631 |  |
Pension and other postretirement benefit obligations | 874 | 1,081 |  |
Deferred compensation | 351 | 327 |  |
Payable to subsidiaries | 0 | 14 |  |
Notes due to subsidiaries | 1,250 | 1,000 |  |
Dividends payable to shareholders | 201 | 199 |  |
Other liabilities | 162 | 112 |  |
Total liabilities | 10,663 | 9,364 |  |
Shareholders’ equity |  |  |  |
Preferred stock and additional capital paid-in, $1 par value, 25 million shares authorized, 81.0 thousand and 92.5 thousand shares issued and outstanding, $2,025 and $2,313 aggregate liquidation preference | 1,970 | 2,248 |  |
Common stock, $.01 par value, 2.0 billion shares authorized and 900 million issued, 304 million and 319 million shares outstanding | 9 | 9 |  |
Additional capital paid-in | 3,498 | 3,463 |  |
Retained income | 52,767 | 48,074 |  |
Treasury Stock, Value | (31,331) | (29,746) |  |
Accumulated other comprehensive income: |  |  |  |
Unrealized net capital gains and losses | 3,180 | 1,887 |  |
Unrealized foreign currency translation adjustments | (7) | (59) |  |
Unamortized pension and other postretirement prior service credit | 131 | 122 |  |
Total accumulated other comprehensive income | 3,304 | 1,950 |  |
Total shareholders’ equity | 30,217 | 25,998 |  |
Total liabilities and shareholders’ equity | 40,880 | 35,362 |  |
Additional balance sheet disclosures: |  |  |  |
AFSs, debt securities, amortized cost | 0 | 458 |  |
Other short term Investments, amortized cost | $ 4,479 | $ 702 |  |
Preferred stock, par or stated value per share (in USD per share) | $ 1 | $ 1 |  |
Preferred stock, shares authorized (in shares) | 25,000,000 | 25,000,000 |  |
Preferred stock, shares issued (in shares) | 81,000.0 | 92,500 |  |
Preferred stock, shares outstanding (in shares) | 81,000.0 | 92,500 |  |
Preferred Stock, liquidation preference | $ 2,025 | $ 2,313 |  |
Common stock, par or stated value per share (in USD per share) | $ 0.01 | $ 0.01 |  |
Common stock, shares authorized (in shares) | 2,000,000,000.0 | 2,000,000,000.0 |  |
Common stock, shares, issued (in shares) | 900,000,000 | 900,000,000 |  |
Common stock, shares, outstanding (in shares) | 304,000,000 | 319,000,000 |  |
Treasury stock, shares (in shares) | 596,000,000 | 581,000,000 |  |

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