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Acquisitions Acquisitions (narrative) (Details) - USD ($) $ in Millions |  | 6 Months Ended |
--- | --- | --- | ---
Jan. 14, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 15,434 |  | $ 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 |  | (275) | $ (358) |
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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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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