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Note 20 - Retirement Plans - Summary of U.S. Defined Benefit Pension Plan Investments in Hedge Funds by Type for Those Investments Values at NAV (Details) - UNITED STATES - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Net Asset Value $ 2,649 $ 3,447
Multi-Strategy Hedge Funds [Member]    
Net Asset Value 495 653
Relative Value Hedge Funds [Member]    
Net Asset Value 331 354
Directional Hedge Funds [Member]    
Net Asset Value 167 260
Equity Long/Short Hedge Funds [Member]    
Net Asset Value 227 225
Sector Specialist Hedge Funds [Member]    
Net Asset Value 135 107
Long-Biased Hedge Funds [Member]    
Net Asset Value 159 138
Event Driven Hedge Funds [Member]    
Net Asset Value 14 64
Hedge Funds [Member]    
Net Asset Value $ 1,528 $ 1,801