Note 13 - Fair Value Measurements - Financial Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($) $ in Millions		Mar. 31, 2021		Dec. 31, 2020
Other current assets	[1],[3]	$ 329	[2]	$ 152	[4]
Other assets	[1],[3]	198		139	[4]
Other accrued liabilities	[1]	52		189
Other liabilities	[1]	37		155
Investments	[5]			137
Fair Value, Inputs, Level 1 [Member]
Other current assets	[1],[2],[3]	109
Investments	[5]			137
Fair Value, Inputs, Level 2 [Member]
Other current assets	[1],[3]	216	[2]	148	[4]
Other assets	[1],[3]	182		123	[4]
Other accrued liabilities	[1]	52		189
Other liabilities	[1]	37		155
Fair Value, Inputs, Level 3 [Member]
Other current assets	[1],[3]	4	[2]	4	[4]
Other assets	[1],[3]	$ 16		$ 16	[4]

[1] Derivative assets and liabilities include foreign exchange contracts which are measured using observable inputs for similar assets and liabilities.

[2] Equity securities with readily available fair values that are measured using Level 1 inputs are included in other current assets, in the amount of $109 million as of March 31, 2021.

[3] Included in other current assets and other assets is a contingent consideration asset for a cost adjustment contract of $20 million, resulting from the HSG Transactions as of September 9, 2020, that were measured using unobservable (Level 3) inputs.

[4] For the year ended December 31, 2020, assets and liabilities that were measured using unobservable (Level 3) inputs resulted in losses recognized in earnings of $21 million for a renewable energy derivative contract and $4 million for auction rate securities, respectively.

[5] Included in the investments were equity securities with readily available fair values that were measured using Level 1 inputs. A pre-tax gain of $107 million was recognized from the initial public offering of an investment for the year ended December 31, 2020.