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Debt (Schedule of Debt Outstanding) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Apr. 14, 2017 | Dec. 31, 2016 | Mar. 31, 2000
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Repurchase agreements | $ 1,408 |  | $ 1,403 |
Short-term debt | 1,013 |  | 500 |
Long-term debt | 11,556 |  | 12,610 |
Trust preferred securities | 308 |  | 308 |
Chubb INA Capital Securities Due 2067 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount | 1,000 |  |  |
Junior Subordinated Debt [Member] | Chubb INA Capital Securities Due 2067 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 964 |  | 962 |
Debt Instrument, Face Amount | $ 1,000 |  |  |
Long-term debt stated interest rate | 3.97% | 6.375% |  |
Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 11,556 |  | 12,610 |
Senior Notes | INA Senior Notes Due February 2017 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term debt | 0 |  | 500 |
Long-term debt | 0 |  | 0 |
Debt Instrument, Face Amount | $ 500 |  |  |
Long-term debt stated interest rate | 5.70% |  |  |
Additional percentage on 'make-whole' premium | 0.20% |  |  |
Senior Notes | INA Senior Notes Due March 2018 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term debt | $ 300 |  | 0 |
Long-term debt | 0 |  | 300 |
Debt Instrument, Face Amount | $ 300 |  |  |
Long-term debt stated interest rate | 5.80% |  |  |
Additional percentage on 'make-whole' premium | 0.35% |  |  |
Senior Notes | INA Senior Notes Due May 2018 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term debt | $ 610 |  | 0 |
Senior Notes | Chubb INA Senior Notes Due 2018 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 0 |  | 635 |
Debt Instrument, Face Amount | $ 600 |  |  |
Long-term debt stated interest rate | 5.75% |  |  |
Additional percentage on 'make-whole' premium | 0.30% |  |  |
Senior Notes | Chubb INA Senior Notes Due August 2018 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term debt | $ 103 |  | 0 |
Senior Notes | INA Senior Notes Due June 2019 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 499 |  | 498 |
Debt Instrument, Face Amount | $ 500 |  |  |
Long-term debt stated interest rate | 5.90% |  |  |
Additional percentage on 'make-whole' premium | 0.40% |  |  |
Senior Notes | INA Senior Notes Due November 2020 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 1,296 |  | 1,294 |
Debt Instrument, Face Amount | $ 1,300 |  |  |
Long-term debt stated interest rate | 2.30% |  |  |
Additional percentage on 'make-whole' premium | 0.15% |  |  |
Senior Notes | INA Senior Notes Due November 2022 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 995 |  | 994 |
Debt Instrument, Face Amount | $ 1,000 |  |  |
Long-term debt stated interest rate | 2.875% |  |  |
Additional percentage on 'make-whole' premium | 0.20% |  |  |
Senior Notes | INA Senior Notes Due March 2023 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 472 |  | 471 |
Debt Instrument, Face Amount | $ 475 |  |  |
Long-term debt stated interest rate | 2.70% |  |  |
Additional percentage on 'make-whole' premium | 0.10% |  |  |
Senior Notes | INA Senior Notes Due May 2024 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 695 |  | 695 |
Debt Instrument, Face Amount | $ 700 |  |  |
Long-term debt stated interest rate | 3.35% |  |  |
Additional percentage on 'make-whole' premium | 0.15% |  |  |
Senior Notes | INA Senior Notes Due March 2025 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 795 |  | 794 |
Debt Instrument, Face Amount | $ 800 |  |  |
Long-term debt stated interest rate | 3.15% |  |  |
Additional percentage on 'make-whole' premium | 0.15% |  |  |
Senior Notes | INA Senior Notes Due May 2026 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 1,489 |  | 1,488 |
Debt Instrument, Face Amount | $ 1,500 |  |  |
Long-term debt stated interest rate | 3.35% |  |  |
Additional percentage on 'make-whole' premium | 0.20% |  |  |
Senior Notes | INA Senior Notes Due May 2036 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 297 |  | 297 |
Debt Instrument, Face Amount | $ 300 |  |  |
Long-term debt stated interest rate | 6.70% |  |  |
Additional percentage on 'make-whole' premium | 0.20% |  |  |
Senior Notes | Chubb INA Senior Notes Due 2037 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 971 |  | 980 |
Debt Instrument, Face Amount | $ 800 |  |  |
Long-term debt stated interest rate | 6.00% |  |  |
Additional percentage on 'make-whole' premium | 0.20% |  |  |
Senior Notes | Chubb INA Senior Notes Due 2038 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 768 |  | 776 |
Debt Instrument, Face Amount | $ 600 |  |  |
Long-term debt stated interest rate | 6.50% |  |  |
Additional percentage on 'make-whole' premium | 0.30% |  |  |
Senior Notes | INA Senior Notes Due March 2043 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 469 |  | 469 |
Debt Instrument, Face Amount | $ 475 |  |  |
Long-term debt stated interest rate | 4.15% |  |  |
Additional percentage on 'make-whole' premium | 0.15% |  |  |
Senior Notes | INA Senior Notes Due November 2045 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 1,482 |  | 1,482 |
Debt Instrument, Face Amount | $ 1,500 |  |  |
Long-term debt stated interest rate | 4.35% |  |  |
Additional percentage on 'make-whole' premium | 0.25% |  |  |
Senior Notes | Other |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 10 |  | 11 |
Senior secured debentures | Chubb INA Senior Notes Due August 2018 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 0 |  | 107 |
Debt Instrument, Face Amount | $ 100 |  |  |
Long-term debt stated interest rate | 6.60% |  |  |
Senior secured debentures | INA Senior Notes Due August 2029 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 100 |  | 100 |
Debt Instrument, Face Amount | $ 100 |  |  |
Long-term debt stated interest rate | 8.875% |  |  |
Unsecured Debt [Member] | Chubb INA Senior Notes Due 2031 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 254 |  | 257 |
Debt Instrument, Face Amount | $ 200 |  |  |
Long-term debt stated interest rate | 6.80% |  |  |
Additional percentage on 'make-whole' premium | 0.25% |  |  |
Trust Preferred Securities | INA capital securities due 2030 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount | $ 309 |  |  | $ 300
Trust preferred securities | $ 308 |  | 308 |
Long-term debt stated interest rate | 9.70% |  |  | 9.70%
Repurchase agreements |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term debt | $ 1,408 |  | $ 1,403 |
Weighted average interest rate on short-term debt | 1.50% |  | 0.80% |
Minimum | Junior Subordinated Debt [Member] | Chubb INA Capital Securities Due 2067 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Additional percentage on 'make-whole' premium | 0.25% |  |  |
Minimum | Senior Notes | Other |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt stated interest rate | 2.75% |  |  |
Maximum | Junior Subordinated Debt [Member] | Chubb INA Capital Securities Due 2067 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Additional percentage on 'make-whole' premium | 0.50% |  |  |
Maximum | Senior Notes | Other |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt stated interest rate | 7.10% |  |  |

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