Note 11 - Employee Retirement Plans - Domestic Defined Benefit Plan Assets (Details) - UNITED STATES - Pension Plan and Other Postretirement Benefits Plan [Member] - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Fair value of plan assets		$ 2,760	$ 2,688
Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets		552	491
Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets		2,205	2,166
Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets		3	31
Defined Benefit Plan, Equity Securities, US [Member]
Fair value of plan assets		1,260	1,168
Defined Benefit Plan, Equity Securities, US [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets		9	63
Defined Benefit Plan, Equity Securities, US [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets		1,251	1,105
US Treasury Securities [Member]
Fair value of plan assets		204	400
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets		204	400
Debt Security, Corporate, US [Member]
Fair value of plan assets		946	1,060
Debt Security, Corporate, US [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets		946	1,060
Preferred Stock [Member]
Fair value of plan assets		1	1
Preferred Stock [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets		1	1
Private Equity Funds [Member]
Fair value of plan assets	[1]		24
Private Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	[1]		24
Defined Benefit Plan, Real Estate [Member]
Fair value of plan assets	[2]	3	7
Defined Benefit Plan, Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	[2]	3	7
Defined Benefit Plan, Cash and Cash Equivalents [Member]
Fair value of plan assets		346	28
Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets		$ 339	$ 28

[1] This category includes venture capital, leverage buyouts and distressed debt limited partnerships invested primarily in U.S. companies. The inputs are valued by discounted cash flow analysis and comparable sale analysis.

[2] This category includes industrial, office, apartments, hotels, infrastructure and retail investments which are limited partnerships predominately in the U.S. The inputs are valued by discounted cash flow analysis; comparable sale analysis and periodic external appraisals.