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Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Balance Sheet) (Detail) (USD $)
In Millions, unless otherwise specified |
Sep. 30, 2014
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Dec. 31, 2013
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Sep. 30, 2013
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Dec. 31, 2012
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| Condensed Financial Statements, Captions [Line Items] | ||||||||||||||||
| Investments | $ 63,254 | $ 60,928 | ||||||||||||||
| Cash | 806 | [1],[2] | 579 | [1],[3] | 768 | [4] | 615 | [4] | ||||||||
| Insurance and reinsurance balances receivable | 5,189 | 5,026 | ||||||||||||||
| Reinsurance recoverable on losses and loss expenses | 10,945 | 11,227 | ||||||||||||||
| Reinsurance recoverable on policy benefits | 228 | 218 | ||||||||||||||
| Value of business acquired | 491 | 536 | ||||||||||||||
| Goodwill and other intangible assets | 5,425 | 5,404 | ||||||||||||||
| Other assets | 11,219 | 10,592 | ||||||||||||||
| Total assets | 97,557 | 94,510 | ||||||||||||||
| Unpaid losses and loss expenses | 37,447 | 37,443 | ||||||||||||||
| Unearned premiums | 8,020 | 7,539 | ||||||||||||||
| Future policy benefits | 4,782 | 4,615 | ||||||||||||||
| Short-term debt | 1,851 | 1,901 | ||||||||||||||
| Long-term debt | 4,057 | 3,807 | ||||||||||||||
| Trust preferred securities | 309 | 309 | ||||||||||||||
| Other liabilities | 11,074 | 10,071 | ||||||||||||||
| Total liabilities | 67,540 | 65,685 | ||||||||||||||
| Total shareholders' equity | 30,017 | 28,825 | 28,218 | |||||||||||||
| Total liabilities and shareholders’ equity | 97,557 | 94,510 | ||||||||||||||
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ACE Limited (Parent Guarantor)
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| Condensed Financial Statements, Captions [Line Items] | ||||||||||||||||
| Investments | 31 | 32 | ||||||||||||||
| Cash | 8 | [1],[2] | 0 | [1],[3] | 11 | [4] | 103 | [4] | ||||||||
| Investments in subsidiaries | 30,065 | 28,351 | ||||||||||||||
| Due from subsidiaries and affiliates, net | 768 | 844 | ||||||||||||||
| Other assets | 4 | 5 | ||||||||||||||
| Total assets | 30,876 | 29,232 | ||||||||||||||
| Affiliated notional cash pooling programs | 573 | [2] | 185 | [3] | ||||||||||||
| Trust preferred securities | 0 | |||||||||||||||
| Other liabilities | 286 | 222 | ||||||||||||||
| Total liabilities | 859 | 407 | ||||||||||||||
| Total shareholders' equity | 30,017 | 28,825 | ||||||||||||||
| Total liabilities and shareholders’ equity | 30,876 | 29,232 | ||||||||||||||
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ACE INA Holdings Inc (Subsidiary Issuer)
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| Condensed Financial Statements, Captions [Line Items] | ||||||||||||||||
| Investments | 25 | 10 | ||||||||||||||
| Cash | 12 | [1],[2] | 16 | [1],[3] | 165 | [4] | 2 | [4] | ||||||||
| Insurance and reinsurance balances receivable | 0 | 0 | ||||||||||||||
| Reinsurance recoverable on losses and loss expenses | 0 | 0 | ||||||||||||||
| Reinsurance recoverable on policy benefits | 0 | 0 | ||||||||||||||
| Value of business acquired | 0 | 0 | ||||||||||||||
| Goodwill and other intangible assets | 0 | 0 | ||||||||||||||
| Investments in subsidiaries | 19,054 | 18,105 | ||||||||||||||
| Other assets | 272 | 258 | ||||||||||||||
| Total assets | 19,363 | 18,389 | ||||||||||||||
| Unpaid losses and loss expenses | 0 | 0 | ||||||||||||||
| Unearned premiums | 0 | 0 | ||||||||||||||
| Future policy benefits | 0 | 0 | ||||||||||||||
| Due to subsidiaries and affiliates, net | 556 | 714 | ||||||||||||||
| Short-term debt | 450 | 500 | ||||||||||||||
| Affiliated notional cash pooling programs | 32 | [2] | 0 | [3] | ||||||||||||
| Long-term debt | 4,045 | 3,795 | ||||||||||||||
| Trust preferred securities | 309 | 309 | ||||||||||||||
| Other liabilities | 1,432 | 1,318 | ||||||||||||||
| Total liabilities | 6,824 | 6,636 | ||||||||||||||
| Total shareholders' equity | 12,539 | 11,753 | ||||||||||||||
| Total liabilities and shareholders’ equity | 19,363 | 18,389 | ||||||||||||||
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Other ACE Limited Subsidiaries
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| Condensed Financial Statements, Captions [Line Items] | ||||||||||||||||
| Investments | 63,198 | 60,886 | ||||||||||||||
| Cash | 1,391 | [1],[2] | 748 | [1],[3] | 1,464 | [4] | 859 | [4] | ||||||||
| Insurance and reinsurance balances receivable | 6,149 | 5,835 | ||||||||||||||
| Reinsurance recoverable on losses and loss expenses | 19,948 | 20,057 | ||||||||||||||
| Reinsurance recoverable on policy benefits | 1,236 | 1,215 | ||||||||||||||
| Value of business acquired | 491 | 536 | ||||||||||||||
| Goodwill and other intangible assets | 5,425 | 5,404 | ||||||||||||||
| Other assets | 14,669 | 13,788 | ||||||||||||||
| Total assets | 112,507 | 108,469 | ||||||||||||||
| Unpaid losses and loss expenses | 46,003 | 45,714 | ||||||||||||||
| Unearned premiums | 9,828 | 9,242 | ||||||||||||||
| Future policy benefits | 5,790 | 5,612 | ||||||||||||||
| Due to subsidiaries and affiliates, net | 212 | 130 | ||||||||||||||
| Short-term debt | 1,401 | 1,401 | ||||||||||||||
| Affiliated notional cash pooling programs | 0 | [2] | 0 | [3] | ||||||||||||
| Long-term debt | 12 | 12 | ||||||||||||||
| Trust preferred securities | 0 | |||||||||||||||
| Other liabilities | 12,681 | 11,655 | ||||||||||||||
| Total liabilities | 75,927 | 73,766 | ||||||||||||||
| Total shareholders' equity | 36,580 | 34,703 | ||||||||||||||
| Total liabilities and shareholders’ equity | 112,507 | 108,469 | ||||||||||||||
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Consolidating Adjustments and Eliminations
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| Condensed Financial Statements, Captions [Line Items] | ||||||||||||||||
| Investments | 0 | 0 | ||||||||||||||
| Cash | (605) | [1],[2] | (185) | [1],[3] | (872) | [4] | (349) | [4] | ||||||||
| Insurance and reinsurance balances receivable | (960) | (809) | ||||||||||||||
| Reinsurance recoverable on losses and loss expenses | (9,003) | (8,830) | ||||||||||||||
| Reinsurance recoverable on policy benefits | (1,008) | (997) | ||||||||||||||
| Value of business acquired | 0 | 0 | ||||||||||||||
| Goodwill and other intangible assets | 0 | 0 | ||||||||||||||
| Investments in subsidiaries | (49,119) | (46,456) | ||||||||||||||
| Due from subsidiaries and affiliates, net | (768) | (844) | ||||||||||||||
| Other assets | (3,726) | (3,459) | ||||||||||||||
| Total assets | (65,189) | (61,580) | ||||||||||||||
| Unpaid losses and loss expenses | (8,556) | (8,271) | ||||||||||||||
| Unearned premiums | (1,808) | (1,703) | ||||||||||||||
| Future policy benefits | (1,008) | (997) | ||||||||||||||
| Due to subsidiaries and affiliates, net | (768) | (844) | ||||||||||||||
| Short-term debt | 0 | 0 | ||||||||||||||
| Affiliated notional cash pooling programs | (605) | [2] | (185) | [3] | ||||||||||||
| Long-term debt | 0 | |||||||||||||||
| Trust preferred securities | 0 | |||||||||||||||
| Other liabilities | (3,325) | (3,124) | ||||||||||||||
| Total liabilities | (16,070) | (15,124) | ||||||||||||||
| Total shareholders' equity | (49,119) | (46,456) | ||||||||||||||
| Total liabilities and shareholders’ equity | $ (65,189) | $ (61,580) | ||||||||||||||
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