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Segment information
 3 Months Ended
Mar. 31, 2023
Segment Reporting [Abstract]  
Segment information Segment information
Chubb operates through six business segments: North America Commercial P&C Insurance, North America Personal P&C Insurance, North America Agricultural Insurance, Overseas General Insurance, Global Reinsurance, and Life Insurance. These segments distribute their products through various forms of brokers, agencies, and direct marketing programs. All business segments have established relationships with reinsurance intermediaries. Segment results for the three months ended March 31, 2023, include the results of Cigna's business in Asia, which are principally assigned to our Life Insurance segment and, to a lesser extent, our Overseas General Insurance segment according to the nature of the business written.

Management uses underwriting income (loss) as the basis for segment performance for its P&C operations. P&C underwriting income (loss) excludes the Life Insurance segment and is calculated by subtracting Losses and loss expenses, Policy benefits, Policy acquisition costs, and Administrative expenses from Net premiums earned. Segment income (loss) includes underwriting income (loss), net investment income (loss), and other operating income and expense items such as each segment's share of the operating income (loss) related to partially-owned entities and miscellaneous income and expense items for which the segments are held accountable. Our main measure of segment performance is Segment income (loss), which also includes amortization of purchased intangibles acquired by the segment. We determined that this definition of segment income (loss) is appropriate and aligns with how the business is managed. We continue to evaluate our segments as our business continues to evolve and may further refine our segments and segment income (loss) measures.

Revenue and expenses managed at the corporate level, including net realized gains (losses), market risk benefits gains (losses), interest expense, Cigna integration expenses, and income tax are reported within Corporate. Cigna integration expenses are one-time costs that are directly attributable to third-party consulting fees, employee-related retention costs, and other professional and legal fees related to the acquisition of Cigna's A&H and Life insurance companies in several Asian markets. These items are not allocated to the segment level as they are one-time in nature and are not related to the ongoing business activities of the segment. The Chief Executive Officer does not manage segment results or allocate resources to segments when considering these costs, and therefore are excluded from our definition of segment income (loss).

Certain items are presented in a different manner for segment reporting purposes than in the Consolidated Financial Statements. These items are reconciled to the consolidated presentation in the Segment measure reclass column below and include:

•Losses and loss expenses include realized gains and losses on crop derivatives. These derivatives were purchased to provide economic benefit, in a manner similar to reinsurance protection, in the event that a significant decline in commodity pricing impacts underwriting results. We view gains and losses on these derivatives as part of the results of
our underwriting operations, and therefore realized gains (losses) from these derivatives are reclassified to losses and loss expenses.

•Policy benefits include fair value changes on separate accounts that do not qualify for separate accounting under GAAP. These gains and losses have been reclassified from Other (income) expense. We view gains and losses from fair value changes in both separate account assets and liabilities as part of the results of our underwriting operations, and therefore these gains and losses are reclassified to policy benefits.

•Net investment income includes investment income reclassified from Other (income) expense related to partially-owned investment companies (private equity partnerships) where our ownership interest is in excess of three percent. We view investment income from these equity-method private equity partnerships as net investment income for segment reporting purposes.
The following tables present the Statement of Operations by segment:
For the Three Months Ended
March 31, 2023
(in millions of U.S. dollars) 		North America Commercial P&C InsuranceNorth America Personal P&C InsuranceNorth America Agricultural InsuranceOverseas General InsuranceGlobal
Reinsurance		Life InsuranceCorporateSegment Measure ReclassChubb Consolidated
Net premiums written$4,288 $1,296 $293 $3,263 $277 $1,293 $— $— $10,710 
Net premiums earned4,369 1,320 159 2,786 244 1,264 — — 10,142 
Losses and loss expenses2,729 888 140 1,237 112 32 11 (1)5,148 
Policy benefits— — — 110 — 712 — (25)797 
Policy acquisition costs613 272 15 713 62 273 — — 1,948 
Administrative expenses295 79 3 280 9 167 97 — 930 
Underwriting income (loss)732 81 1 446 61 80 (108)26 1,319 
Net investment income698 82 17 188 49 153 11 (91)1,107 
Other (income) expense7 1 1 (9)(1)(15)(214)(66)(296)
Amortization expense of
   purchased intangibles		— 2 6 18 — 4 42 — 72 
Segment income$1,423 $160 $11 $625 $111 $244 $75 $1 $2,650 
Net realized gains (losses)(76)(1)(77)
Market risk benefits gains (losses)(115)— (115)
Interest expense160 — 160 
Cigna integration expenses22 — 22 
Income tax expense384 — 384 
Net income (loss)$(682)$— $1,892 

For the Three Months Ended
March 31, 2022 (As Adjusted)
(in millions of U.S. dollars)		North America Commercial P&C Insurance North America Personal P&C InsuranceNorth America Agricultural InsuranceOverseas General Insurance Global
Reinsurance		Life InsuranceCorporateSegment Measure ReclassChubb
Consolidated
Net premiums written$4,039 $1,180 $62 $3,079 $253 $576 $— $— $9,189 
Net premiums earned4,114 1,247 (29)2,628 235 542 — — 8,737 
Losses and loss expenses2,497 713 (92)1,296 115 24 10 1 4,564 
Policy benefits— — — 93 — 311 — (31)373 
Policy acquisition costs573 260 12 679 62 133 — — 1,719 
Administrative expenses265 69 (1)269 9 84 83 — 778 
Underwriting income (loss)779 205 52 291 49 (10)(93)30 1,303 
Net investment income (loss)489 59 7 147 85 103 (5)(63)822 
Other (income) expense6 1 — 2 — (30)(259)(32)(312)
Amortization expense of
   purchased intangibles		— 2 7 14 — 2 46 — 71 
Segment income$1,262 $261 $52 $422 $134 $121 $115 $(1)$2,366 
Net realized gains (losses)22 1 23 
Market risk benefits gains (losses)49 — 49 
Interest expense132 — 132 
Income tax expense353 — 353 
Net income (loss)$(299)$— $1,953 
Underwriting assets are reviewed in total by management for purposes of decision-making. Other than Unpaid losses and loss expenses, Future policy benefits, Reinsurance recoverables, DAC, VOBA, Goodwill and Other intangible assets, Chubb does not allocate assets to its segments.