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Acquisitions Acquisitions (narrative) (Details) - USD ($) $ in Millions |  | 9 Months Ended |
--- | --- | --- | ---
Jan. 14, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 15,707 |  | $ 15,332
The Chubb Corporation [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Purchase price | $ 29,500 |  |  |
Cash consideration paid by Chubb Limited to common shareholders of Chubb Corp | 14,300 |  |  |
Equity Issued in Business Combination, Fair Value Disclosure | 15,200 |  |  |
Business Combination, Consideration Transferred | 29,800 |  |  |
Goodwill | 10,500 |  |  |
Additional Paid-in Capital [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Attributed Value Equity Awards Assumed in Acquisition |  | (311) | $ (365) |
Additional Paid-in Capital [Member] | The Chubb Corporation [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Attributed Value Equity Awards Assumed in Acquisition | $ 323 | $ 0 | $ 323 |

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