The company doesn't disclose an offering size, but it's expected to raise ~$17B - a level on par with last year's debt offering.
Separately, Apple has updated its MacBook Air lineup to feature slightly faster Intel Haswell CPUs - the entry-level model now has a 1.4GHz. dual-core Core i5 chip, improved from a 1.3GHz. chip - and (more importantly) has cut prices across the board by $100.
An 11" MacBook Air with a 128GB SSD now goes for $899, and the 256GB model for $1,099. The 13"/128GB model goes for $999, and the 13"/256GB model for $1,199.
Apple had March quarter Mac revenue of $5.5B (+1% Y/Y) on the back of 4.1M unit sales. A 12" retina MacBook Air is reportedly due later this year.