Consolidated Financial Results2
AT&T's consolidated revenues for the third quarter totaled $45.7 billion versus $39.7 billion in the year-ago quarter, up 15.3%, primarily due to the Time Warner acquisition partially offset by the impact of ASC 606 and the netting of approximately $920 million of USF revenues with operating expenses. Without the accounting change, revenues were $46.6 billion, an increase of 17.5% primarily due to the Time Warner acquisition. Declines in domestic video, legacy wireline services and Vrio were offset by growth in wireless equipment and services, WarnerMedia and Xandr.
Operating expenses were $38.5 billion versus $33.9 billion in the year-ago quarter, primarily due to the Time Warner acquisition partially offset by the netting of USF and other regulatory fee revenues and the deferral of commissions under ASC 606. Excluding those impacts, operating expenses were $39.9 billion, an increase of about $6.1 billion due to the Time Warner acquisition, higher wireless equipment costs and Entertainment Group content cost pressure, partially offset by cost efficiencies.
Versus results from the third quarter of 2017, operating income was $7.3 billion, up 25.2% primarily due to the Time Warner acquisition; and operating income margin was 15.9% versus 14.6%. On a comparative basis, operating income was $6.7 billion and operating income margin was 14.3%. When adjusting for amortization, merger- and integration-related expenses and other items, operating income was $10.0 billion, or $9.4 billion on a comparative basis, versus $7.5 billion in the year-ago quarter, and operating income margin was 21.9%, or 20.3% on a comparative basis, versus 18.8% in the year-ago quarter.
Third-quarter net income attributable to AT&T was $4.7 billion, or $0.65 per diluted share, versus $3.0 billion, or $0.49 per diluted share, in the year-ago quarter. Adjusting for $0.25 of costs for amortization, merger- and integration-related expenses and other items, earnings per diluted share was $0.90 compared to an adjusted $0.74 in the year-ago quarter, a 21.6% increase.
Cash from operating activities was $12.3 billion, and capital expenditures were $5.9 billion. Capital investment included about $560 million in FirstNet capital costs and reflects no FirstNet reimbursements. Free cash flow — cash from operating activities minus capital expenditures — was $6.5 billion for the quarter. The company is successfully managing near-term maturities and refinancing risk and expects to have retired or refinanced about $28 billion of near-to-intermediate term maturities by the end of 2018.