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Investment Information (Tables)
12 Months Ended
Dec. 31, 2025
Disclosure Investment Information [Abstract]  
Summary of fair value and cost or amortized cost of available for sale securities
The following table summarizes the fair value and cost or amortized cost of the Company’s securities classified as available for sale:
Estimated
Fair
Value
Gross Unrealized GainsGross Unrealized LossesAllowance for Expected Credit LossesCost or
Amortized
Cost
December 31, 2025
Fixed maturities:
Corporate bonds$14,058 $265 $(142)$(10)$13,945 
U.S. government and government agencies7,445 23 (21)— 7,443 
Asset backed securities3,574 20 (15)(8)3,577 
Non-U.S. government securities3,270 53 (81)(1)3,299 
Residential mortgage backed securities2,705 34 (21)— 2,692 
Commercial mortgage backed securities1,212 11 (5)(1)1,207 
Municipal bonds162 — (4)— 166 
Total32,426 406 (289)(20)32,329 
Short-term investments2,625 (1)— 2,624 
Total$35,051 $408 $(290)$(20)$34,953 
December 31, 2024
Fixed maturities:
Corporate bonds$12,487 $110 $(346)$(12)$12,735 
U.S. government and government agencies6,710 (149)— 6,851 
Asset backed securities2,900 19 (32)(8)2,921 
Non-U.S. government securities2,538 30 (107)(1)2,616 
Residential mortgage backed securities1,079 (31)— 1,104 
Commercial mortgage backed securities1,058 (11)(1)1,064 
Municipal bonds263 — (16)— 279 
Total27,035 179 (692)(22)27,570 
Short-term investments2,784 (2)— 2,784 
Total$29,819 $181 $(694)$(22)$30,354 
Summary of available for sale securities in a continual unrealized loss position
The following table summarizes, for all available for sale securities in an unrealized loss position, the fair value and gross unrealized loss by length of time the security has been in a continual unrealized loss position:
Less than 12 Months12 Months or MoreTotal
Estimated Fair
Value
Gross Unrealized LossesEstimated Fair
Value
Gross Unrealized LossesEstimated Fair
Value
Gross Unrealized Losses
December 31, 2025
Fixed maturities:
Corporate bonds$2,972 $(64)$1,364 $(78)$4,336 $(142)
U.S. government and government agencies3,092 (15)274 (6)3,366 (21)
Non-U.S. government securities2,087 (35)432 (46)2,519 (81)
Residential mortgage backed securities312 (3)178 (18)490 (21)
Asset backed securities806 (2)332 (13)1,138 (15)
Commercial mortgage backed securities239 (1)48 (4)287 (5)
Municipal bonds— 137 (4)143 (4)
Total9,514 (120)2,765 (169)12,279 (289)
Short-term investments614 (1)— — 614 (1)
Total$10,128 $(121)$2,765 $(169)$12,893 $(290)
December 31, 2024
Fixed maturities:
Corporate bonds$4,582 $(114)$2,924 $(232)$7,506 $(346)
U.S. government and government agencies5,130 (100)516 (49)5,646 (149)
Non-U.S. government securities1,650 (58)418 (49)2,068 (107)
Residential mortgage backed securities571 (6)186 (25)757 (31)
Asset backed securities236 (8)426 (24)662 (32)
Commercial mortgage backed securities180 (1)434 (10)614 (11)
Municipal bonds48 (1)176 (15)224 (16)
Total12,397 (288)5,080 (404)17,477 (692)
Short-term investments97 (2)— — 97 (2)
Total$12,494 $(290)$5,080 $(404)$17,574 $(694)
Contractual maturities of the Company's fixed maturities and fixed maturities pledged under securities lending arrangements
The contractual maturities of the Company’s fixed maturities are shown in the following table. Expected maturities, which are management’s best estimates, will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
December 31, 2025December 31, 2024
Maturity
Estimated Fair Value
Amortized Cost
Estimated Fair Value
Amortized Cost
Due in one year or less$370 $366 $438 $451 
Due after one year through five years17,053 16,989 15,364 15,590 
Due after five years through 10 years6,893 6,877 5,811 6,039 
Due after 10 years619 621 385 401 
24,935 24,853 21,998 22,481 
Mortgage backed securities2,705 2,692 1,079 1,104 
Commercial mortgage backed securities1,212 1,207 1,058 1,064 
Asset backed securities3,574 3,577 2,900 2,921 
Total$32,426 $32,329 $27,035 $27,570 
Components of net investment income
The components of net investment income were derived from the following sources:
Year Ended December 31,
202520242023
Fixed maturities$1,465 $1,266 $917 
Short-term investments102 144 68 
Equity securities (dividends)41 40 22 
Other (1)109 136 93 
Gross investment income1,717 1,586 1,100 
Investment expenses(92)(91)(77)
Net investment income$1,625 $1,495 $1,023 
(1)    Amounts include dividends and other distributions on investment funds, term loan investments, funds held balances, cash balances and other items.
Summary of net realized gains (losses)
Net realized gains (losses) were as follows:
Year Ended December 31,
202520242023
Available for sale securities:
Gross gains on investment sales$296 $259 $116 
Gross losses on investment sales(271)(354)(547)
Change in fair value of assets and liabilities accounted for using the fair value option:
Fixed maturities29 18 
Other investments38 (144)27 
Equity securities— (1)
Short-term investments— — 
Equity securities, at fair value :
Net realized gains (losses) on securities sold84 62 61 
Net unrealized gains (losses) on equity securities still held at reporting date130 108 88 
Allowance for credit losses:
Investments related(6)— 
Underwriting related(1)
Derivative instruments (1)327 59 
Other (2)(169)251 10 
Net realized gains (losses)$464 $197 $(165)
(1)    See note 11, for information on the Company’s derivative instruments.
(2)    Amounts in the 2025 periods primarily include losses related to the sale of certain alternative investments accounted for under the equity method, while amounts in the 2024 period include benefits from the sale of Castel Underwriting Agencies Limited and the acquisition of RMIC Companies, Inc.
Other investments
The following table summarizes the Company’s assets and liabilities which are accounted for using the fair value option:
December 31,
20252024
Other investments$1,957 $2,135 
Fixed maturities1,110 854 
Equity securities
Short-term investments64 70 
Total other investments$3,136 $3,066 
The following table summarizes the Company’s other investments, as detailed in the previous table, by strategy:

December 31,

2025

2024
Investment grade fixed income1,225 1,055 
Private equity250 229 
Lending220 303 
Term loan investments173 430 
Credit related funds87 99 
Energy19 
Total
$1,957 $2,135 
Summary of investments in limited partnership interests where the Company has a variable interest
The following table summarizes investments in limited partnership interests where the Company has a variable interest by balance sheet item:
December 31,
20252024
Investments accounted for using the equity method (1)$6,453 $5,980 
Investments accounted for using the fair value option (2)— 48 
Total$6,453 $6,028 
(1)     Aggregate unfunded commitments were $3.6 billion at December 31, 2025, compared to $4.3 billion at December 31, 2024.
(2)    Aggregate unfunded commitments were $65 million at December 31, 2025, compared to $21 million at December 31, 2024.
Investments accounted for using the equity method
The following table summarizes the Company’s investments accounted for using the equity method, by strategy:

December 31,

20252024
Private equity$2,397 $1,915 
Credit related funds1,616 1,487 
Real estate767 869 
Lending558 616 
Fixed income501 384 
Infrastructure346 425 
Equities231 217 
Energy37 67 
Total
$6,453 $5,980 
A summary of aggregated financial information for the Company’s investment funds and operating affiliates accounted for using the equity method is as follows:
December 31,
20252024
Invested assets$139,175 $113,977 
Total assets156,736 132,647 
Total liabilities37,031 36,614 
Net assets$119,705 $96,033 
Year Ended December 31,
202520242023
Total revenues$21,594 $19,160 $7,766 
Total expenses8,643 7,269 7,174 
Net income (loss)$12,951 $11,891 $592 
Roll forward of the allowance for expected credit losses of securities classified as available for sale
The following table provides a roll forward of the allowance for expected credit losses of the Company’s securities classified as available for sale:
Year Ended December 31, 2025Structured Securities (1)Non-U.S. Government SecuritiesCorporate
Bonds
Total
Balance at beginning of period$$$12 $22 
Additions for current-period provision for expected credit losses— 
Additions (reductions) for previously recognized expected credit losses(3)— — 
Reductions due to disposals— — (7)(7)
Balance at end of period$$$10 $20 
Year Ended December 31, 2024
Balance at beginning of period$$$20 $28 
Additions for current-period provision for expected credit losses— — — — 
Additions (reductions) for previously recognized expected credit losses — (3)— 
Reductions due to disposals(1)— (5)(6)
Balance at end of period$$$12 $22 
(1)    Includes asset backed securities, mortgage backed securities and commercial mortgage backed securities.
Summary of restricted assets
The following table details the value of the Company’s restricted assets:
December 31,
20252024
Assets used for collateral or guarantees:
Affiliated transactions$5,323 $4,730 
Third party agreements6,784 5,999 
Deposits with U.S. regulatory authorities948 882 
Other (1)1,898 1,437 
Total restricted assets $14,953 $13,048 
(1) Primarily includes Funds at Lloyd’s, deposits with non-U.S. regulatory authorities and other restricted assets.
Reconciliation of cash and restricted cash
The following table details reconciliation of cash and restricted cash within the Consolidated Balance Sheets:
December 31,
202520242023
Cash$993 $979 $917 
Restricted cash (included in ‘other assets’)1,074 781 581 
Cash and restricted cash$2,067 $1,760 $1,498