CVS Health’s fourth-quarter earnings nearly doubled, fueled by a $1.5 billion tax benefit

that will help the drugstore chain expand its growing role in customer care. The company said it will use the break it gets from the recently completed federal tax overhaul to raise starting pay for its hourly workers and pare debt ahead of its planned $69 billion acquisition of insurer Aetna. It will also pump more money into data analytics. This technology can help the company track prescription drug use or monitor data like blood tests to determine if a patient’s health or a condition is growing worse. That can cut healthcare costs by helping pharmacists or other care providers intervene before a big medical expense like a hospital stay hits.