Welsh Secretary David Jones has said the UK Government would be liable for any future Welsh Government debt.
His comments came as MPs debated plans which could see the Welsh Government given power to borrow money for major construction projects. But he said any Welsh debt would still be the ultimate responsibility of Westminster.
More top news
The cash windfall follows the announcement that an extra £20 billion a year by 2023/24 will be invested in health services across the UK.
The funding will help businesses in the sector improve their businesses before Brexit.
A new speed limit has come into force on major roads and motorways to help tackle air pollution.