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General (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Unearned premiums | $ 13,448 |  | $ 13,473 |
Deferred policy acquisition costs | $ 4,409 |  | 4,191 |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Unearned premiums |  | $ 160 |  |
Deferred policy acquisition costs |  | $ 160 |  |
Retained income |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect of change in accounting principle |  |  | 1,088 | $ 0
Retained income | Accounting Standards Update 2016-01 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect of change in accounting principle |  |  | 1,160 |
Limited partnership interests | Accounting Standards Update 2016-01 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect of change in accounting principle |  |  | 224 |
Limited partnership interests | Retained income | Accounting Standards Update 2016-01 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect of change in accounting principle |  |  | $ 177 |

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