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Note 5 - Retirement Plans - Plan Assets Measured At Fair Value (Details) - Pension Plan [Member] - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Plan Assets Fair Value $ 4,400 $ 4,363 $ 5,554
Fair Value, Recurring [Member]      
Plan Assets Fair Value 4,400 4,363  
Fair Value, Recurring [Member] | Defined Benefit Plan, Debt Security [Member]      
Plan Assets Fair Value [1] 0 68  
Fair Value, Recurring [Member] | Venture Capital And Buyout Partnerships [Member]      
Plan Assets Fair Value 554 611  
Fair Value, Recurring [Member] | Defined Benefit Plan, Real Estate [Member]      
Plan Assets Fair Value 30 37  
Fair Value, Recurring [Member] | Common Trust And Other Funds [Member]      
Plan Assets Fair Value 382 622  
Fair Value, Recurring [Member] | Other Assets Pension Plan [Member]      
Plan Assets Fair Value [2] 49 35  
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]      
Plan Assets Fair Value 176 1,111  
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Defined Benefit Plan, Cash [Member]      
Plan Assets Fair Value 0 1  
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Defined Benefit Plan, Equity Securities [Member]      
Plan Assets Fair Value [3] 0 6  
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member]      
Plan Assets Fair Value 0 0  
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]      
Plan Assets Fair Value 0 0  
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Defined Benefit Plan, Equity Securities, Common Stock [Member]      
Plan Assets Fair Value 176 1,104  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]      
Plan Assets Fair Value 3,209 1,879  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Defined Benefit Plan, Cash [Member]      
Plan Assets Fair Value 0 0  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Defined Benefit Plan, Equity Securities [Member]      
Plan Assets Fair Value [3] 0 0  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member]      
Plan Assets Fair Value 1,508 803  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]      
Plan Assets Fair Value 1,696 1,069  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Defined Benefit Plan, Equity Securities, Common Stock [Member]      
Plan Assets Fair Value 5 7  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]      
Plan Assets Fair Value 0 0  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Defined Benefit Plan, Cash [Member]      
Plan Assets Fair Value 0 0  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Defined Benefit Plan, Equity Securities [Member]      
Plan Assets Fair Value [3] 0 0  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member]      
Plan Assets Fair Value 0 0  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]      
Plan Assets Fair Value 0 0  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Defined Benefit Plan, Equity Securities, Common Stock [Member]      
Plan Assets Fair Value 0 0  
Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] | Fair Value, Recurring [Member]      
Plan Assets Fair Value 3,385 2,990  
Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] | Fair Value, Recurring [Member] | Defined Benefit Plan, Cash [Member]      
Plan Assets Fair Value 0 1  
Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] | Fair Value, Recurring [Member] | Defined Benefit Plan, Equity Securities [Member]      
Plan Assets Fair Value [3] 0 6  
Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member]      
Plan Assets Fair Value 1,508 803  
Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]      
Plan Assets Fair Value 1,696 1,069  
Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] | Fair Value, Recurring [Member] | Defined Benefit Plan, Equity Securities, Common Stock [Member]      
Plan Assets Fair Value 181 1,111  
Fair Value Measured at Net Asset Value Per Share [Member] | Fair Value, Recurring [Member]      
Plan Assets Fair Value $ 966 $ 1,338  
[1] Registered investment companies measured at NAV include bond investments.
[2] Includes accrued receivables, net payables, and pending broker settlements.
[3] Registered investment companies measured at fair value are stock investments.