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Note 20 - Reconciliation of Beginning and Ending Balances of Assets Measured With Significant Unobservable Inputs (Details) - Major US Plans [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Pension Income Expense from Continuing and Discontinued Operations for Major Defined Benefit Plans [Line Items]    
Fair value of plan assets at beginning of period $ 3,445  
Fair value of plan assets at end of period 3,610 $ 3,445
Real Estate [Member]    
Pension Income Expense from Continuing and Discontinued Operations for Major Defined Benefit Plans [Line Items]    
Fair value of plan assets at beginning of period 57  
Fair value of plan assets at end of period 42 57
Private Equity Funds [Member]    
Pension Income Expense from Continuing and Discontinued Operations for Major Defined Benefit Plans [Line Items]    
Fair value of plan assets at beginning of period 665  
Fair value of plan assets at end of period 687 665
Fair Value, Inputs, Level 3 [Member]    
Pension Income Expense from Continuing and Discontinued Operations for Major Defined Benefit Plans [Line Items]    
Fair value of plan assets at beginning of period 6 40
Net Realized and Unrealized Gains Relating to Assets Still Held 2 1
Net Realized and Unrealized Gains Relating to Assets Sold During the Period   14
Net Purchases, Sales and Settlements (1) (49)
Fair value of plan assets at end of period 7 6
Fair Value, Inputs, Level 3 [Member] | Real Estate [Member]    
Pension Income Expense from Continuing and Discontinued Operations for Major Defined Benefit Plans [Line Items]    
Fair value of plan assets at beginning of period   26
Net Realized and Unrealized Gains Relating to Assets Sold During the Period   14
Net Purchases, Sales and Settlements   (40)
Fair Value, Inputs, Level 3 [Member] | Private Equity Funds [Member]    
Pension Income Expense from Continuing and Discontinued Operations for Major Defined Benefit Plans [Line Items]    
Fair value of plan assets at beginning of period 6 14
Net Realized and Unrealized Gains Relating to Assets Still Held 2 1
Net Purchases, Sales and Settlements (1) (9)
Fair value of plan assets at end of period $ 7 $ 6