The Wall Street Journal said the deal could happen as early as this weekend.
It would unite AT&T's wireless, broadband and satellite TV brands with Time Warner's entertainment empire, which includes cable networks such as TNT, TBS, CNN, the prized HBO channel, and the Warner Bros film and TV studio, the daily said.
Earlier Apple had eyed on Time Warner, but the negotiations could not move beyond a point.
"If a Time Warner sale occurs that could encourage other telecom and media companies to pursue their own combinations," the Journal said.
The deal would set a milestone in the converging media and telecommunications sectors and unleash a far-reaching reordering of the industry as rivals are spurred to attempt their own deals, it said.
According to The Wall Street Journal, an AT&T-Time Warner merger would be the most ambitious marriage of content and distribution since Comcast Corp's 2011 purchase of NBCUniversal and would create a behemoth that rivals that cable giant.
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