It reported 15 million paid subscribers for its Peacock streaming service, up from 13 million in the previous quarter.
Total company revenue fell 1.5% to $29.85 billion in the quarter, compared with estimates of $29.65 billion, according to Refinitiv data.
Net loss attributable to Comcast was $4.6 billion, or $1.05 per share, compared with a profit of $4.04 billion, or 86 cents per share, a year earlier.
The net loss was partly due to an $8.6 billion goodwill impairment charge in its UK pay-TV company, Sky.
NBCUniversal's theme parks division generated $2.06 billion in revenue, versus $1.45 billion a year ago.