PL/SQL :: Finding ID Max (salary)

Select * from one:

ID SALARY
----------------------
10 1000
20 2000
30 3200

Select * from two:

ID SALARY
----------------------
10     1000
20     2000
40     4000
10     3000
20     4000
30     3000

When i try to find ID,MAX(SALARY) from these two tables, i am getting this output:

Select id,max(salary)
from
(select * from one
union
select * from two)
group by id
order by max(salary) desc;

OUTPUT:

ID MAX(SALARY)
--------------------------------------
20     4000
40     4000
30     3200
10     3000

I want OUTPUT to be like this:

ID MAX(SALARY)
--------------------------------------
20     4000
40     4000