Abbreviated type name long long vs long long int, is it standard-compliant?

Most of the code I see use abbreviated types to declare a variable, such as

long long x; // long long int x
short y; // short int y

I skimmed through the C++11 standard (Sec. 3.9.1) and the type is always declared fully, as long long int. I couldn't find any mentioning of abbreviated types. I am pretty sure the abbreviations are standard-compliant, but wanted to make sure if this is indeed the case. So my question is whether the above code is fully standard compliant.