Note 13 - Fair Value Measurements - Financial Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($) $ in Millions		Sep. 30, 2021		Dec. 31, 2020
Other current assets	[1]	$ 197	[2],[3]	$ 152	[4],[5]
Other assets	[1]	162	[3]	139	[4],[5]
Other accrued liabilities	[1]	72		189
Other liabilities	[1]	46	[6]	155
Investments	[7]			137
Fair Value, Inputs, Level 1 [Member]
Other current assets	[1]	11	[2],[3]		[4],[5]
Other assets	[1]		[3]		[4],[5]
Other accrued liabilities	[1]
Other liabilities	[1]		[6]
Investments	[7]			137
Fair Value, Inputs, Level 2 [Member]
Other current assets	[1]	176	[2],[3]	148	[4],[5]
Other assets	[1]	155	[3]	123	[4],[5]
Other accrued liabilities	[1]	72		189
Other liabilities	[1]	46	[6]	155
Investments	[7]
Fair Value, Inputs, Level 3 [Member]
Other current assets	[1]	10	[2],[3]	4	[4],[5]
Other assets	[1]	7	[3]	16	[4],[5]
Other accrued liabilities	[1]
Other liabilities	[1]		[6]
Investments	[7]

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

[2] Equity securities with readily available fair values of $11 million were measured using Level 1 inputs and have been included in other current assets as of September 30, 2021. An investment was sold for $84 million during the second quarter of 2021.

[3] Included in other current assets and other assets is a contingent consideration asset for a cost adjustment contract of $17 million, resulting from the HSG Transactions as of September 9, 2020, that was 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.

[5] 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 was measured using unobservable (Level 3) inputs.

[6] Other liabilities include a $17 million put option pursuant to the Share Repurchase Agreement with SDC, which was measured using significant other observable (Level 2) inputs. Refer to Note 14 (Shareholders' Equity) to the consolidated financial statements for additional information.

[7] Included in 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.