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Retirement benefits - Assets Held In Retirement Benefit Accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension benefits      
Fair value measurements on a recurring basis      
Fair value of plan assets $ 1,888,853 $ 1,973,539 $ 1,806,379
Other benefits      
Fair value measurements on a recurring basis      
Fair value of plan assets 217,890 207,372 $ 190,547
Fair value measurements on a recurring basis | Pension benefits      
Fair value measurements on a recurring basis      
Fair value of plan assets 1,889,000 1,974,000  
Fair value measurements on a recurring basis | Pension benefits | Total, excluding cash, receivables and payables, net      
Fair value measurements on a recurring basis      
Fair value of plan assets 1,887,000 1,984,000  
Fair value measurements on a recurring basis | Pension benefits | Equity investments      
Fair value measurements on a recurring basis      
Fair value of plan assets 1,233,000 $ 1,275,000  
Fair value measurements on a recurring basis | Pension benefits | Non-U.S equity securities      
Fair value measurements on a recurring basis      
Redemption frequency, daily   63.00%  
Redemption frequency, monthly   37.00%  
Fair value measurements on a recurring basis | Pension benefits | Total fixed income investments      
Fair value measurements on a recurring basis      
Fair value of plan assets   $ 599,000  
Fair value measurements on a recurring basis | Pension benefits | Cash, receivables and payables, net      
Fair value measurements on a recurring basis      
Fair value of plan assets 2,000 (10,000)  
Fair value measurements on a recurring basis | Pension benefits | Cash, receivables and payables, net | American Savings Bank (ASB)      
Fair value measurements on a recurring basis      
Fair value of plan assets   1,000  
Fair value measurements on a recurring basis | Other benefits      
Fair value measurements on a recurring basis      
Fair value of plan assets 218,000 207,000  
Fair value measurements on a recurring basis | Other benefits | Total, excluding cash, receivables and payables, net      
Fair value measurements on a recurring basis      
Fair value of plan assets 217,000 207,000  
Fair value measurements on a recurring basis | Other benefits | Equity investments      
Fair value measurements on a recurring basis      
Fair value of plan assets 154,000 $ 148,000  
Fair value measurements on a recurring basis | Other benefits | Non-U.S equity securities      
Fair value measurements on a recurring basis      
Redemption frequency, daily   61.00%  
Redemption frequency, monthly   39.00%  
Fair value measurements on a recurring basis | Other benefits | Total fixed income investments      
Fair value measurements on a recurring basis      
Fair value of plan assets   $ 55,000  
Fair value measurements on a recurring basis | Other benefits | Cash, receivables and payables, net      
Fair value measurements on a recurring basis      
Fair value of plan assets 1,000 0  
Fair value measurements on a recurring basis | Fair Value, Inputs, Level 1, 2 and 3 | Pension benefits | U.S. equity securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 403,000 449,000  
Fair value measurements on a recurring basis | Fair Value, Inputs, Level 1, 2 and 3 | Pension benefits | Non-U.S equity securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 20,000 165,000  
Fair value measurements on a recurring basis | Fair Value, Inputs, Level 1, 2 and 3 | Pension benefits | U.S. equity index and exchange-traded funds (ETFs)      
Fair value measurements on a recurring basis      
Fair value of plan assets 484,000 584,000  
Fair value measurements on a recurring basis | Fair Value, Inputs, Level 1, 2 and 3 | Pension benefits | Fixed income securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 546,000 85,000  
Fair value measurements on a recurring basis | Fair Value, Inputs, Level 1, 2 and 3 | Pension benefits | Fixed income securities | American Savings Bank (ASB)      
Fair value measurements on a recurring basis      
Fair value of plan assets   85,000  
Fair value measurements on a recurring basis | Fair Value, Inputs, Level 1, 2 and 3 | Pension benefits | Fixed income securities      
Fair value measurements on a recurring basis      
Fair value of plan assets   264,000  
Fair value measurements on a recurring basis | Fair Value, Inputs, Level 1, 2 and 3 | Other benefits | U.S. equity securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 48,000 54,000  
Fair value measurements on a recurring basis | Fair Value, Inputs, Level 1, 2 and 3 | Other benefits | Non-U.S equity securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 2,000 20,000  
Fair value measurements on a recurring basis | Fair Value, Inputs, Level 1, 2 and 3 | Other benefits | U.S. equity index and exchange-traded funds (ETFs)      
Fair value measurements on a recurring basis      
Fair value of plan assets 63,000 64,000  
Fair value measurements on a recurring basis | Fair Value, Inputs, Level 1, 2 and 3 | Other benefits | Fixed income securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 52,000 0  
Fair value measurements on a recurring basis | Fair Value, Inputs, Level 1, 2 and 3 | Other benefits | Fixed income securities      
Fair value measurements on a recurring basis      
Fair value of plan assets   53,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Pension benefits | Total, excluding cash, receivables and payables, net      
Fair value measurements on a recurring basis      
Fair value of plan assets 1,634,000 1,490,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Pension benefits | Equity investments      
Fair value measurements on a recurring basis      
Fair value of plan assets 1,233,000 1,198,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Pension benefits | U.S. equity securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 403,000 449,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Pension benefits | Non-U.S equity securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 20,000 165,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Pension benefits | U.S. equity index and exchange-traded funds (ETFs)      
Fair value measurements on a recurring basis      
Fair value of plan assets 484,000 584,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Pension benefits | Non-U.S. equity index and ETFs      
Fair value measurements on a recurring basis      
Fair value of plan assets 326,000    
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Pension benefits | Total fixed income investments      
Fair value measurements on a recurring basis      
Fair value of plan assets   277,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Pension benefits | Fixed income securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 401,000 13,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Pension benefits | Fixed income securities      
Fair value measurements on a recurring basis      
Fair value of plan assets   264,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Pension benefits | Private equity at net asset value (NAV)      
Fair value measurements on a recurring basis      
Fair value of plan assets 0 0  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Pension benefits | Cash equivalents, fund and at NAV      
Fair value measurements on a recurring basis      
Fair value of plan assets 0 15,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Other benefits | Total, excluding cash, receivables and payables, net      
Fair value measurements on a recurring basis      
Fair value of plan assets 186,000 194,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Other benefits | Equity investments      
Fair value measurements on a recurring basis      
Fair value of plan assets 154,000 138,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Other benefits | U.S. equity securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 48,000 54,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Other benefits | Non-U.S equity securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 2,000 20,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Other benefits | U.S. equity index and exchange-traded funds (ETFs)      
Fair value measurements on a recurring basis      
Fair value of plan assets 63,000 64,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Other benefits | Non-U.S. equity index and ETFs      
Fair value measurements on a recurring basis      
Fair value of plan assets 41,000    
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Other benefits | Total fixed income investments      
Fair value measurements on a recurring basis      
Fair value of plan assets   53,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Other benefits | Fixed income securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 22,000 0  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Other benefits | Fixed income securities      
Fair value measurements on a recurring basis      
Fair value of plan assets   53,000  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Other benefits | Private equity at net asset value (NAV)      
Fair value measurements on a recurring basis      
Fair value of plan assets 0 0  
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Other benefits | Cash equivalents, fund and at NAV      
Fair value measurements on a recurring basis      
Fair value of plan assets 10,000 3,000  
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Pension benefits | Total, excluding cash, receivables and payables, net      
Fair value measurements on a recurring basis      
Fair value of plan assets 145,000 72,000  
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Pension benefits | Equity investments      
Fair value measurements on a recurring basis      
Fair value of plan assets 0 0  
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Pension benefits | U.S. equity securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 0 0  
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Pension benefits | Non-U.S equity securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 0 0  
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Pension benefits | U.S. equity index and exchange-traded funds (ETFs)      
Fair value measurements on a recurring basis      
Fair value of plan assets 0 0  
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Pension benefits | Total fixed income investments      
Fair value measurements on a recurring basis      
Fair value of plan assets   72,000  
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Pension benefits | Fixed income securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 145,000 72,000  
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Pension benefits | Private equity at net asset value (NAV)      
Fair value measurements on a recurring basis      
Fair value of plan assets 0 0  
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Other benefits | Total, excluding cash, receivables and payables, net      
Fair value measurements on a recurring basis      
Fair value of plan assets 30,000 0  
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Other benefits | Equity investments      
Fair value measurements on a recurring basis      
Fair value of plan assets 0 0  
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Other benefits | U.S. equity securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 0 0  
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Other benefits | Non-U.S equity securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 0 0  
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Other benefits | U.S. equity index and exchange-traded funds (ETFs)      
Fair value measurements on a recurring basis      
Fair value of plan assets 0 0  
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Other benefits | Total fixed income investments      
Fair value measurements on a recurring basis      
Fair value of plan assets   0  
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Other benefits | Fixed income securities      
Fair value measurements on a recurring basis      
Fair value of plan assets 30,000 0  
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Other benefits | Private equity at net asset value (NAV)      
Fair value measurements on a recurring basis      
Fair value of plan assets 0 0  
Fair value measurements on a recurring basis | Net Asset Value | Pension benefits      
Fair value measurements on a recurring basis      
Fair value of plan assets 108,000 422,000  
Fair value measurements on a recurring basis | Net Asset Value | Pension benefits | Non-U.S equity securities      
Fair value measurements on a recurring basis      
Fair value of plan assets   $ 77,000  
Fair value measurements on a recurring basis | Net Asset Value | Pension benefits | Non-U.S equity securities | Minimum      
Fair value measurements on a recurring basis      
Redemption notice period   5 days  
Fair value measurements on a recurring basis | Net Asset Value | Pension benefits | Non-U.S equity securities | Maximum      
Fair value measurements on a recurring basis      
Redemption notice period   30 days  
Fair value measurements on a recurring basis | Net Asset Value | Pension benefits | Non-U.S. equity index and ETFs      
Fair value measurements on a recurring basis      
Fair value of plan assets 326,000 $ 77,000  
Fair value measurements on a recurring basis | Net Asset Value | Pension benefits | Fixed income securities      
Fair value measurements on a recurring basis      
Fair value of plan assets   $ 250,000  
Redemption notice period   15 days  
Fair value measurements on a recurring basis | Net Asset Value | Pension benefits | Non-U.S. fixed income securities      
Fair value measurements on a recurring basis      
Fair value of plan assets   $ 250,000  
Fair value measurements on a recurring basis | Net Asset Value | Pension benefits | Private equity at net asset value (NAV)      
Fair value measurements on a recurring basis      
Fair value of plan assets 63,000 50,000  
Unfunded commitments 122,000 138,000  
Unfunded commitments, entered into $ 100,000    
Dissolution written notice period (in months) 6 months    
Fair value measurements on a recurring basis | Net Asset Value | Pension benefits | Cash equivalents, fund and at NAV      
Fair value measurements on a recurring basis      
Fair value of plan assets $ 45,000 60,000  
Fair value measurements on a recurring basis | Net Asset Value | Pension benefits | Cash equivalents, fund and at NAV | American Savings Bank (ASB)      
Fair value measurements on a recurring basis      
Fair value of plan assets   15,000  
Fair value measurements on a recurring basis | Net Asset Value | Pension benefits | Cash equivalents      
Fair value measurements on a recurring basis      
Fair value of plan assets $ 45,000 $ 45,000  
Fair value measurements on a recurring basis | Net Asset Value | Pension benefits | Cash equivalents | Minimum      
Fair value measurements on a recurring basis      
Redemption notice period 0 days 0 days  
Fair value measurements on a recurring basis | Net Asset Value | Pension benefits | Cash equivalents | Maximum      
Fair value measurements on a recurring basis      
Redemption notice period 1 day 1 day  
Fair value measurements on a recurring basis | Net Asset Value | Other benefits      
Fair value measurements on a recurring basis      
Fair value of plan assets $ 1,000 $ 13,000  
Fair value measurements on a recurring basis | Net Asset Value | Other benefits | Non-U.S equity securities      
Fair value measurements on a recurring basis      
Fair value of plan assets   $ 10,000  
Fair value measurements on a recurring basis | Net Asset Value | Other benefits | Non-U.S equity securities | Minimum      
Fair value measurements on a recurring basis      
Redemption notice period   5 days  
Fair value measurements on a recurring basis | Net Asset Value | Other benefits | Non-U.S equity securities | Maximum      
Fair value measurements on a recurring basis      
Redemption notice period   30 days  
Fair value measurements on a recurring basis | Net Asset Value | Other benefits | Non-U.S. equity index and ETFs      
Fair value measurements on a recurring basis      
Fair value of plan assets 41,000 $ 10,000  
Fair value measurements on a recurring basis | Net Asset Value | Other benefits | Fixed income securities      
Fair value measurements on a recurring basis      
Fair value of plan assets   $ 2,000  
Redemption notice period   15 days  
Fair value measurements on a recurring basis | Net Asset Value | Other benefits | Non-U.S. fixed income securities      
Fair value measurements on a recurring basis      
Fair value of plan assets   $ 2,000  
Fair value measurements on a recurring basis | Net Asset Value | Other benefits | Private equity at net asset value (NAV)      
Fair value measurements on a recurring basis      
Fair value of plan assets 1,000 1,000  
Fair value measurements on a recurring basis | Net Asset Value | Other benefits | Cash equivalents, fund and at NAV      
Fair value measurements on a recurring basis      
Fair value of plan assets 10,000 3,000  
Fair value measurements on a recurring basis | Net Asset Value | Other benefits | Cash equivalents      
Fair value measurements on a recurring basis      
Fair value of plan assets $ 0 $ 0  
Fair value measurements on a recurring basis | Net Asset Value | Other benefits | Cash equivalents | Minimum      
Fair value measurements on a recurring basis      
Redemption notice period 0 days 0 days  
Fair value measurements on a recurring basis | Net Asset Value | Other benefits | Cash equivalents | Maximum      
Fair value measurements on a recurring basis      
Redemption notice period 1 day 1 day