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Acquisitions and Dispositions - Intangible asset by type (Details) - National General Holdings Corp. - USD ($) $ in Millions |  | 6 Months Ended
--- | --- | ---
Jan. 04, 2021 | Jun. 30, 2021
Business Acquisition [Line Items] |  |
Intangible assets | $ 1,199 |
Maximum |  |
Business Acquisition [Line Items] |  |
Finite-lived intangible asset, useful life (in years) | 10 years | 12 months
Minimum |  |
Business Acquisition [Line Items] |  |
Finite-lived intangible asset, useful life (in years) | 3 years | 6 months
Distribution and customer relationships |  |
Business Acquisition [Line Items] |  |
Intangible assets | $ 795 |
Trade names |  |
Business Acquisition [Line Items] |  |
Intangible assets | 102 |
Licenses |  |
Business Acquisition [Line Items] |  |
Intangible assets | 97 |
Technology |  |
Business Acquisition [Line Items] |  |
Intangible assets | $ 205 |

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