Note 13 - Employee Retirement Plans - Domestic Defined Benefit Plan Assets (Details) - UNITED STATES - Pension Plan and Other Postretirement Benefits Plan [Member] - USD ($) $ in Millions		Dec. 31, 2021	Dec. 31, 2020
Fair value of plan assets		$ 3,607	$ 3,605
Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets		584	231
Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets		2,972	3,183
Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets		51	191
Defined Benefit Plan, Equity Securities, US [Member]
Fair value of plan assets		977	781
Defined Benefit Plan, Equity Securities, US [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets		20	1
Defined Benefit Plan, Equity Securities, US [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets		957	780
Defined Benefit Plan, Equity Securities, Non-US [Member]
Fair value of plan assets		234	441
Defined Benefit Plan, Equity Securities, Non-US [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets		234	441
US Treasury Securities [Member]
Fair value of plan assets		256	147
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets		256	147
Debt Security, Corporate, US [Member]
Fair value of plan assets		1,770	1,951
Debt Security, Corporate, US [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets		1,770	1,951
Preferred Stock [Member]
Fair value of plan assets		11	11
Preferred Stock [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets		11	11
Private Equity Funds [Member]
Fair value of plan assets	[1]	41	51
Private Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	[1]	41	51
Defined Benefit Plan, Real Estate [Member]
Fair value of plan assets	[2]	10	140
Defined Benefit Plan, Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	[2]	10	140
Defined Benefit Plan, Cash and Cash Equivalents [Member]
Fair value of plan assets		308	83
Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets		$ 308	$ 83

[1] This category includes venture capital, leverage buyouts and distressed debt limited partnerships invested primarily in U.S. companies. The inputs are valuedby 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.