Note 18 - Earnings Per Common Share - Reconciliation of Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net income		$ 1,906	$ 512	$ 960
Less: Series A convertible preferred stock dividend		24	98	98
Less: Excess consideration paid for redemption of preferred stock	[1]	803
Net income available to common shareholders		1,079	414	862
Plus: Series A convertible preferred stock dividend				98
Net income available to common shareholders - diluted		$ 1,079	$ 414	$ 960
Weighted-average common shares outstanding - basic (in shares)		828	761	776
Stock options and other dilutive securities (in shares)		16	11	8
Series A convertible preferred stock (1) (in shares)	[2]			115
Weighted-average common shares outstanding - diluted (in shares)		844	772	899
Basic (Note 18) (in dollars per share)		$ 1.30	$ 0.54	$ 1.11
Diluted (Note 18) (in dollars per share)		$ 1.28	$ 0.54	$ 1.07
Total (in shares)		31	117	2
Series A Convertible Preferred Stock [Member]
Total (in shares)	[2]	31	115
Share-based Payment Arrangement [Member]
Total (in shares)			2	2

[1] Refer to Note 17 (Shareholders' Equity) and Note 18 (Earnings per Common Share) to the consolidated financial statements for additional information.

[2] For the years ended December 31, 2021 and 2020, the Preferred Stock was anti-dilutive and therefore excluded from the calculation of diluted earnings per share.