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Schedule II (STATEMENTS OF CASH FLOWS - Parent Company Only) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
Purchases of fixed maturities available for sale |  | $ (25,720) |  | $ (30,759) |  | $ (16,040) |
Sales of fixed maturities available for sale |  | 13,228 |  | 16,621 |  | 10,783 |
Net change in short-term investments |  | (537) |  | 12,350 |  | (8,216) |
Net derivative instruments settlements |  | (265) |  | (168) |  | (21) |
Net Cash Provided by (Used in) Investing Activities, Continuing Operations |  | (2,442) |  | (5,315) |  | (6,294) |
Other |  | 114 |  | (10) |  | 263 |
Dividends paid on Common Shares |  | (1,308) |  | (1,173) |  | (862) |
Proceeds from issuance of repurchase agreements |  | 2,353 |  | 2,310 |  | 2,029 |
Repayments of Short-term Debt |  | 2,348 |  | 2,311 |  | 2,027 |
Proceeds from share-based compensation plans |  | 151 |  | 167 |  | 131 |
Net increase (decrease) in cash |  | (257) |  | (790) |  | 1,120 |
Cash – beginning of year |  | 985 | [1],[2],[3] | 1,775 | [2],[4] | 655 | [4]
Cash – end of year | [2] | 728 | [5] | 985 | [1],[3] | 1,775 | [4]
Chubb limited (Parent Guarantor) |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
Payments To From Affiliates |  | 892 |  | 404 |  | (228) |
Cash dividend paid by Affiliates |  | 450 |  | 3,400 |  | 2,900 |
Net cash flows from operating activities |  | 781 |  | 3,618 |  | 3,125 |
Net change in short-term investments |  | 0 |  | 0 |  | 0 |
Net derivative instruments settlements |  | 0 |  | 0 |  | 0 |
Capital contributions to subsidiaries |  | 0 |  | (2,330) |  | (2,670) |
Net Cash Provided by (Used in) Investing Activities, Continuing Operations |  | 0 |  | (2,330) |  | (2,670) |
Other |  |  |  |  |  | 0 |
Dividends paid on Common Shares |  | (1,308) |  | (1,173) |  | (862) |
Repayments of Short-term Debt |  | 0 |  |  |  | 0 |
Net proceeds from (payments to) affiliated notional cash pooling programs |  | (363) |  | (519) |  | 636 |
Proceeds from share-based compensation plans |  | 0 |  | 0 |  | 0 |
Net cash flows (used for) from financing activities |  | (779) |  | (1,288) |  | (454) |
Net increase (decrease) in cash |  | 2 |  | 0 |  | 1 |
Cash – beginning of year |  | 1 | [1],[2],[3] | 1 | [2],[4] | 0 | [4]
Cash – end of year | [2] | $ 3 | [5] | $ 1 | [1],[3] | $ 1 | [4]
[1] | Chubb maintains two notional multi-currency cash pools (Pools) with a third-party bank. Refer to Note 1 f) for additional information. At December 31, 2016 and 2015, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[2] | Chubb maintains two notional multi-currency cash pools (Pools) with a third-party bank. Refer to Note 1 f) for additional information. At December 31, 2017 and 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[3] | Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Refer to Note 1 f) for additional information. At December 31, 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[4] | Chubb maintains two notional multi-currency cash pools (Pools) with a third-party bank. Refer to Note 1 f) for additional information. At December 31, 2015 and 2014, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[5] | Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Refer to Note 1 f) for additional information. At December 31, 2017, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3574-108585 + Details
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