Aug 18 (Reuters) - Moody's -
* Moody's changes Rio Tinto (LON:RIO) Group's and all subsidiary outlooks to stable; affirms all ratings (BAA1 Sr. Unsecured)
* Moody's on Rio Tinto Group - Outlook anticipates company to be free cash flow generative, liquidity position to continue comfortably above ongoing requirements
* Moody's - We expect Rio Tinto's performance to slowly improve from the weak levels evidenced in 2015, particularly in the second half Source text for Eikon: