Use “id.” for the citation just above

Style note²Federal courts, Illinois courts21st and 22nd editions

A periodical that is the sole authority in the citation immediately above is repeated as “id.” with an updated pincite; “supra” is reserved for a full citation standing further back.¹

1. 1B16.2 Short Form Citation. Tables: R. 4.1 “Id.”; R. 4.2(a) “Supra.”; R. 16.9(a) Id.
2. 2A style note: the rule in note 1 allows both forms and prefers one.