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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, 2023
Dec. 31, 2022
UNITED STATES    
Net Asset Value $ 2,664 $ 2,649
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 $ 509 $ 495
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 $ 342 $ 331
Directional Hedge Funds [Member]    
Redemption Frequency 5 days 5 days
Directional Hedge Funds [Member] | UNITED STATES    
Net Asset Value $ 143 $ 167
Equity Long/Short Hedge Funds [Member] | Minimum [Member]    
Redemption Frequency 45 days 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 $ 264 $ 227
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 $ 120 $ 135
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 $ 160 $ 159
Event Driven Hedge Funds [Member]    
Redemption Frequency 90 days 90 days
Event Driven Hedge Funds [Member] | UNITED STATES    
Net Asset Value $ 14 $ 14
Hedge Funds [Member] | UNITED STATES    
Net Asset Value $ 1,552 $ 1,528