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Retirement Plans and Postretirement Medical Benefits (Fair Value Measurements of Plan Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 10,416 $ 16,820  
United States | Total plan assets at fair value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,161,361 1,549,157  
United States | Total plan assets at fair value | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 114,084 202,416  
United States | Total plan assets at fair value | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,057,547 1,384,514  
United States | Total plan assets at fair value | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 91,500 77,494  
United States | Total plan assets at fair value | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,263,131 1,664,424  
United States | Money market funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Money market funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 10,623 3,725  
United States | Money market funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Money market funds | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 10,623 3,725  
United States | Equities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Equities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 137,505 195,037  
United States | Equities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Equities | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 137,505 195,037  
United States | Commingled fixed income securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Commingled fixed income securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 220,281 229,300  
United States | Commingled fixed income securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Commingled fixed income securities | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 220,281 229,300  
United States | Government and related securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 114,084 202,416  
United States | Government and related securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 21,479 26,582  
United States | Government and related securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Government and related securities | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 135,563 228,998  
United States | Corporate debt securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Corporate debt securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 527,407 771,529  
United States | Corporate debt securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Corporate debt securities | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 527,407 771,529  
United States | Mortgage-backed /asset-backed securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Mortgage-backed /asset-backed securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 26,450 12,486  
United States | Mortgage-backed /asset-backed securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Mortgage-backed /asset-backed securities | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 26,450 12,486  
United States | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 42,980 52,491 $ 45,275
United States | Real estate | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Real estate | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Real estate | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 91,500 77,494  
United States | Real estate | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 91,500 77,494  
United States | Securities lending collateral | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Securities lending collateral | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 113,802 145,855  
United States | Securities lending collateral | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Securities lending collateral | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 113,802 145,855  
United States | Diversified growth funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 24,394 52,169 $ 50,750
United States | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3,525 20,569  
United States | Securities lending payable      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 113,802 145,855  
United States | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,909 6,801  
Foreign | Total plan assets at fair value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 438,403 737,443  
Foreign | Total plan assets at fair value | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Foreign | Total plan assets at fair value | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 365,061 624,291  
Foreign | Total plan assets at fair value | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 67,374 104,660  
Foreign | Total plan assets at fair value | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 432,435 728,951  
Foreign | Money market funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Foreign | Money market funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8,338 8,577  
Foreign | Money market funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Foreign | Money market funds | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8,338 8,577  
Foreign | Equities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Foreign | Equities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 42,717 96,596  
Foreign | Equities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Foreign | Equities | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 42,717 96,596  
Foreign | Commingled fixed income securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Foreign | Commingled fixed income securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 247,337 431,845  
Foreign | Commingled fixed income securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Foreign | Commingled fixed income securities | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 247,337 431,845  
Foreign | Government and related securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Foreign | Government and related securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 35,887 46,522  
Foreign | Government and related securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Foreign | Government and related securities | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 35,887 46,522  
Foreign | Corporate debt securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Foreign | Corporate debt securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 26,336 33,583  
Foreign | Corporate debt securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Foreign | Corporate debt securities | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 26,336 33,583  
Foreign | Real estate | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Foreign | Real estate | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4,446 7,168  
Foreign | Real estate | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 42,980 52,491  
Foreign | Real estate | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 47,426 59,659  
Foreign | Diversified growth funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Foreign | Diversified growth funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Foreign | Diversified growth funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 24,394 52,169  
Foreign | Diversified growth funds | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 24,394 52,169  
Foreign | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5,485 7,966  
Foreign | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 483 $ 526