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Note 19 - Retirement Plans - Reconciliation of Beginning and Ending Balances of Assets Measured With Significant Unobservable Inputs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Major US Plans [Member]      
Fair value of plan assets at beginning of period $ 3,659    
Fair value of plan assets at end of period 3,546 $ 3,659  
Major US Plans [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair value of plan assets at beginning of period 3 0 $ 5
Net Realized and Unrealized Gains Relating to Assets Still Held 0 0 (5)
Net Purchases, Sales and Settlements 0 3 0
Fair value of plan assets at end of period 3 3 0
Major US Plans [Member] | Private Equity Funds [Member]      
Fair value of plan assets at beginning of period 1,095    
Fair value of plan assets at end of period 1,097 1,095  
Major US Plans [Member] | Private Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair value of plan assets at beginning of period 3 0 5
Net Realized and Unrealized Gains Relating to Assets Still Held 0 0 (5)
Net Purchases, Sales and Settlements 0 3 0
Fair value of plan assets at end of period 3 3 0
Major Non-US Plans [Member]      
Fair value of plan assets at beginning of period 526    
Fair value of plan assets at end of period 527 526  
Major Non-US Plans [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair value of plan assets at beginning of period 289 342 291
Net Realized and Unrealized Gains Relating to Assets Still Held (2) (53) (37)
Net Purchases, Sales and Settlements 0 0 88
Fair value of plan assets at end of period 287 289 342
Major Non-US Plans [Member] | Private Equity Funds [Member]      
Fair value of plan assets at beginning of period 43    
Fair value of plan assets at end of period 42 43  
Major Non-US Plans [Member] | Private Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair value of plan assets at beginning of period 0    
Fair value of plan assets at end of period 0 0  
Major Non-US Plans [Member] | Insurance Contracts [Member]      
Fair value of plan assets at beginning of period 318    
Fair value of plan assets at end of period 317 318  
Major Non-US Plans [Member] | Insurance Contracts [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair value of plan assets at beginning of period 289 342 291
Net Realized and Unrealized Gains Relating to Assets Still Held (2) (53) (37)
Net Purchases, Sales and Settlements 0 0 88
Fair value of plan assets at end of period $ 287 $ 289 $ 342