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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Schedule of Goodwill by reporting unit | The Company’s goodwill reporting units are equivalent to its reportable segments, Allstate Protection, Service Businesses, Allstate Life and Allstate Benefits to which goodwill has been assigned.
Goodwill by reporting unit
($ in millions) |  | December 31, 2017
Allstate Protection |  | $ | 810 |
Service Businesses |  | 1,100 |
Allstate Life |  | 175 |
Allstate Benefits |  | 96 |
Total |  | $ | 2,181 |
Computation of basic and diluted earnings per common share |
Computation of basic and diluted earnings per common share
|  | For the years ended December 31,
($ in millions, except per share data) |  | 2017 |  | 2016 |  | 2015
Numerator: |  |  |  |  |  |
Net income |  | $ | 3,189 |  |  | $ | 1,877 |  |  | $ | 2,171 |
Less: Preferred stock dividends |  | 116 |  |  | 116 |  |  | 116 |
Net income applicable to common shareholders (1) |  | $ | 3,073 |  |  | $ | 1,761 |  |  | $ | 2,055 |
Denominator: |  |  |  |  |  |
Weighted average common shares outstanding |  | 362.0 |  |  | 372.8 |  |  | 401.1 |
Effect of dilutive potential common shares: |  |  |  |  |  |
Stock options |  | 4.3 |  |  | 3.2 |  |  | 4.0 |
Restricted stock units (non-participating) and performance stock awards |  | 1.5 |  |  | 1.3 |  |  | 1.7 |
Weighted average common and dilutive potential common shares outstanding |  | 367.8 |  |  | 377.3 |  |  | 406.8 |
Earnings per common share – Basic |  | $ | 8.49 |  |  | $ | 4.72 |  |  | $ | 5.12 |
Earnings per common share – Diluted |  | $ | 8.36 |  |  | $ | 4.67 |  |  | $ | 5.05 |
(1) | Net income applicable to common shareholders is net income less preferred stock dividends.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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