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Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Operations) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Condensed Statement of Income Captions [Line Items] |  |  |
Net investment income |  | $ 863 | $ 861
Realized Investment Gains (Losses) |  | 887 | (958)
Administrative expenses |  | (744) | (741)
Interest (income) expense |  | (122) | (132)
Other (income) expense |  | (490) | 55
Income tax expense |  | (338) | (215)
Net income |  | 2,300 | 252
Comprehensive income (loss) |  | 389 | (2,460)
Chubb Limited (Parent Guarantor) |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |
Net investment income | [1] | 1 | (2)
Realized Investment Gains (Losses) | [1] | 13 | (21)
Administrative expenses | [1] | 22 | 24
Interest (income) expense | [1] | (34) | (34)
Other (income) expense | [1] | (13) | (9)
Income tax expense | [1] | 11 | 0
Net income | [1],[2] | 28 | (4)
Comprehensive income (loss) | [1] | 28 | (4)
Equity In Earnings Of Subsidiaries |  | 2,272 | 256
Chubb INA Holdings Inc (Subsidiary Issuer) |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |
Net investment income |  | 1 | 4
Realized Investment Gains (Losses) |  | 67 | 113
Administrative expenses |  | (52) | (38)
Interest (income) expense |  | 145 | 148
Other (income) expense |  | (5) | 8
Income tax expense |  | (22) | 7
Net income | [2] | 2 | (8)
Comprehensive income (loss) |  | 1 | (38)
Equity In Earnings Of Subsidiaries |  | $ 1,031 | $ 593
[1] | Excludes investment in subsidiary issuer (presented separately).
[2] | Net income of Parent Guarantor excludes equity in earnings from investment in subsidiaries, including Subsidiary Issuer, of $2,272 million and $256 million for the three months ended March 31, 2021 and 2020, respectively. Net income of Subsidiary Issuer excludes equity in earnings from investment in subsidiaries of $1,031 million and $593 million for the three months ended March 31, 2021 and 2020, respectively.

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