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Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Balance Sheet) (Detail) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Investments |  | $ 118,979 | $ 118,669 |
Cash |  | 1,684 | 1,747 |
Total assets |  | 191,977 | 190,774 |
Long-term debt |  | 14,879 | 14,948 |
Trust preferred securities |  | 308 | 308 |
Total liabilities |  | 132,901 | 131,333 |
Total shareholders' equity |  | 59,076 | 59,441 | $ 52,197
Total liabilities and shareholders’ equity |  | 191,977 | 190,774 |
Chubb Limited (Parent Guarantor) |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Investments | [1] | 0 | 0 |
Cash | [1] | 23 | 84 |
Due from subsidiaries and affiliates, net | [1] | 3,510 | 3,522 |
Other assets | [1] | 8 | 10 |
Total assets | [1] | 3,541 | 3,616 |
Due to subsidiaries and affiliates, net | [1] | 0 | 0 |
Affiliated notional cash pooling programs | [1] | 0 | 0 |
Long-term debt | [1] | 0 | 0 |
Trust preferred securities | [1] | 0 | 0 |
Other liabilities | [1] | 337 | 323 |
Total liabilities | [1] | 337 | 323 |
Total shareholders' equity | [1],[2] | 3,204 | 3,293 |
Total liabilities and shareholders’ equity | [1] | 3,541 | 3,616 |
Investments in subsidiaries |  | 55,900 | 56,100 |
Chubb INA Holdings Inc (Subsidiary Issuer) |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Investments |  | 206 | 197 |
Cash |  | 1 | 1 |
Due from subsidiaries and affiliates, net |  | 0 | 0 |
Other assets |  | 415 | 463 |
Total assets |  | 622 | 661 |
Due to subsidiaries and affiliates, net |  | 3,079 | 3,008 |
Affiliated notional cash pooling programs |  | 361 | 272 |
Long-term debt |  | 14,879 | 14,948 |
Trust preferred securities |  | 308 | 308 |
Other liabilities |  | 1,281 | 1,418 |
Total liabilities |  | 19,908 | 19,954 |
Total shareholders' equity | [2] | (19,286) | (19,293) |
Total liabilities and shareholders’ equity |  | 622 | 661 |
Investments in subsidiaries |  | $ 54,500 | $ 55,200 |
[1] | Excludes investment in subsidiary issuer (presented separately).
[2] | Total shareholders' equity of Parent Guarantor excludes $55.9 billion and $56.1 billion of investment in subsidiaries, including Subsidiary Issuer, at March 31, 2021 and December 31, 2020, respectively. Total shareholders' equity of Subsidiary Issuer excludes $54.5 billion and $55.2 billion of investment in subsidiaries at March 31, 2021 and December 31, 2020, respectively.

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- Definition Including the current and noncurrent portions, the carrying value of junior subordinated long-term debt owed to unconsolidated subsidiary trusts as of the balance sheet date. Such debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets and was initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. + References No definition available. + Details
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