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Acquisitions Intangible Assets (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 14, 2016 | Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets Acquired | $ 7,655 |
Developed Technology Rights [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life |  | 3 years
Unearned premium reserves [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life |  | 1 year
Distribution Rights [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life |  | 24 years
The Chubb Corporation [Member] | Developed Technology Rights [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired |  | $ 95
The Chubb Corporation [Member] | Trademarks [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Indefinite-lived Intangible Assets Acquired |  | 2,800
The Chubb Corporation [Member] | Unearned premium reserves [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired |  | 1,550
The Chubb Corporation [Member] | Distribution Rights [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired |  | 3,150
The Chubb Corporation [Member] | Licensing Agreements [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Indefinite-lived Intangible Assets Acquired |  | 50
The Chubb Corporation [Member] | Syndicate capacity [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Indefinite-lived Intangible Assets Acquired |  | $ 10

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