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Note 19 - Retirement Plans - Summary of U.S. Defined Benefit Pension Plan Investments in Hedge Funds by Type for Those Investments Values at NAV (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
UNITED STATES    
Net Asset Value $ 856 $ 2,664
Multi-Strategy Hedge Funds [Member] | Minimum [Member]    
Redemption Frequency 45 days 45 days
Multi-Strategy Hedge Funds [Member] | Maximum [Member]    
Redemption Frequency 90 days 90 days
Multi-Strategy Hedge Funds [Member] | UNITED STATES    
Net Asset Value $ 204 $ 509
Relative Value Hedge Funds [Member] | Minimum [Member]    
Redemption Frequency 6 days 6 days
Relative Value Hedge Funds [Member] | Maximum [Member]    
Redemption Frequency 120 days 120 days
Relative Value Hedge Funds [Member] | UNITED STATES    
Net Asset Value $ 185 $ 342
Directional Hedge Funds [Member]    
Redemption Frequency 5 days 5 days
Directional Hedge Funds [Member] | UNITED STATES    
Net Asset Value $ 52 $ 143
Equity Long/Short Hedge Funds [Member] | Minimum [Member]    
Redemption Frequency 45 days Monthly, Quarterly
Equity Long/Short Hedge Funds [Member] | Maximum [Member]    
Redemption Frequency 90 days 90 days
Equity Long/Short Hedge Funds [Member] | UNITED STATES    
Net Asset Value $ 125 $ 264
Sector Specialist Hedge Funds [Member] | Minimum [Member]    
Redemption Frequency 60 days 60 days
Sector Specialist Hedge Funds [Member] | Maximum [Member]    
Redemption Frequency 90 days 90 days
Sector Specialist Hedge Funds [Member] | UNITED STATES    
Net Asset Value $ 44 $ 120
Long-Biased Hedge Funds [Member] | Minimum [Member]    
Redemption Frequency 60 days 60 days
Long-Biased Hedge Funds [Member] | Maximum [Member]    
Redemption Frequency 90 days 90 days
Long-Biased Hedge Funds [Member] | UNITED STATES    
Net Asset Value $ 79 $ 160
Event Driven Hedge Funds [Member]    
Redemption Frequency   90 days
Event Driven Hedge Funds [Member] | UNITED STATES    
Net Asset Value   $ 14
Hedge Funds [Member] | UNITED STATES    
Net Asset Value $ 689 $ 1,552