Murdoch, the chairman of News Corporation, told a US Senate hearing that the deal, which will give his satellite TV operation global reach, would benefit all pay-TV customers.
"This acquisition has the potential to profoundly change the multichannel video marketplace in the US to the ultimate benefit of all pay-TV customers. There will be no decrease in the number of US competitors," Murdoch said.
Murdoch told the Senate Commerce, Science and Transportation Committee that the merger with News Corp's Fox TV business would improve DirecTV.
He said the deal would offer US consumers more choice and improved high-speed internet access.
Murdoch finally secured his long-sought-after acquisition of DirecTV early last month after agreeing terms with General Motors, which owns DirecTV though its Hughes subsidiary.
The deal sees News Corp acquire GM's 19.9% stake in Hughes, the DirecTV holding company, and a further 14.1% of Hughes from public shareholders. The deal gives News Corp 34% ownership of Hughes, which it will transfer to its Fox Entertainment Group.
"With almost 15 years of expertise gained at our worldwide pay-TV platforms, including the industry-leading BSkyB, we are confident in our ability to grow this asset quickly, rewardingly and in a manner consistent with the competitive spirit that has guided News Corp for half a century," Murdoch said at the time.
The deal was only made possible after the Federal Communications Commission rejected merger proposals last year between DirecTV and its rival EchoStar.
Murdoch was attending the Senate hearing as the FCC looks at US media ownership rules and weighs up changes to reflect the impact of cable, satellite and the net. The FCC is due to vote on the proposals on June 2.
The US media watchdog chairman Michael Powell, son of secretary of state Colin Powell, and two other Republican members of the five-strong commission are in favour of easing regulations.
Easing the regulations would allow individual companies to hold bigger shares of local and national media markets. One of the legislation changes would allow a single company to own TV stations that reach 45% of US households instead of the current 35% limit.
However, critics have warned that any easing of these rules would allow just a small number of companies to control what Americans watch on television and read in their newspapers.
The acquisition of DirecTV sees the return of News Corp's former co-chief operating officer Chase Carey to News Corp after an absence of just over a year. He resigned originally after Murdoch's $18bn (£11.4bn) bid for DirecTV failed. He will become president and CEO of Hughes.
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