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Note 5 - Earnings per Common Share (Details Textual) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 08, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Apr. 05, 2021 | Jan. 16, 2021
Stock Redeemed or Called During Period, Value | [1] |  | $ 1,503 |  |  |  |
Retained Earnings [Member] |  |  |  |  |  |  |
Stock Redeemed or Called During Period, Value |  | $ 803 | $ 803 | [1] |  |  |
Series A Convertible Preferred Stock [Member] |  |  |  |  |  |  |
Preferred Stock, Convertible, Shares Issuable (in shares) |  |  |  |  |  |  | 115,000,000
Converted from Preferred Stock [Member] |  |  |  |  |  |  |
Common Stock, Shares, Outstanding, Ending Balance (in shares) |  | 80,000,000 |  |  |  | 80,000,000 |
Conversion of Preferred Stock into Common Stock [Member] |  |  |  |  |  |  |
Conversion of Stock, Shares Converted (in shares) |  |  |  |  | 2,300 |  |
Conversion of Stock, Shares Issued (in shares) |  | 115,000,000 |  |  |  |  |
Conversion of Preferred Stock into Common Stock [Member] | Samsung [Member] |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares (in shares) |  | 35,000,000 |  |  |  |  |
[1] | Refer to Note 4 (Earnings (Loss) per Common Share) and Note 12 (Shareholders' Equity) to the consolidated financial statements for additional information.

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