Note 6 - Other Liabilities - Other Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Wages and employee benefits	$ 488		$ 824
Income taxes	238		196
Derivative instruments (Note 10)	276		144
Deferred revenue (Note 2)	136		148
Customer deposits (Note 2)	236	$ 223	223
Share repurchase liability (Note 12)	507		506
Short-term operating leases	93		94
Other current liabilities	1,118		1,004
Other accrued liabilities	3,092	3,139	3,139
Defined benefit pension plan liabilities	696		707
Derivative instruments (Note 10)	85		49
Deferred revenue (Note 2)	751		764
Customer deposits (Note 2)	985	1,100	1,072
Share repurchase liability (Note 12)	518		517
Deferred tax liabilities	248		258
Long-term operating leases	676		691
Other non-current liabilities	1,149		1,134
Other liabilities	$ 5,108	$ 5,192	$ 5,192