IRS recently stated that the U.S. based holding companies claimed $18.3 billion in foreign tax credit in 2013 which is up from $8.17 billion in the previous year. The foreign tax credit was generally claimed for the tax paid in foreign countries on the dividend income repatriated to the U.S. by these holding companies. The data says that the holding companies reported $25.1 billion in such dividend income in 2013.
The data suggests that U.S. companies are bringing in more income from the foreign earnings to finance U.S. operations.
Since the tax incentives are not the motivation for repatriating the earnings, the economic factors seem to be the driving such a trend.