Senators approved the bill late on Monday, hours after it was passed by the House of Representatives.

The aid includes direct payments for many Americans and support for businesses and unemployment programmes.

The money is to accompany a bigger, $1.4tn spending bill to fund government operations over the next nine months.

President Donald Trump is expected to sign the package into law quickly.

President-elect Joe Biden welcomed the relief package but said Congress needed to get to work to support his Covid-19 relief plan in the new year.

The stimulus includes one-off $600 payments to most Americans, and will boost unemployment payments by $300 per week, extending expiration dates for the jobless programmes until the spring.

It also contains more than $300bn in support for businesses, and money for vaccine distribution, schools and tenants facing eviction.

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The package includes an extension of an eviction moratorium that was due to expire at the end of this month, leaving tens of millions of Americans at risk of being thrown out of their homes. It contains $25bn in rental aid.

The bill also has a provision to end surprise medical billing - where hospital patients get slapped with fees because they were treated by a doctor who was not covered by their health insurer. President Trump has championed calls to end these stealth fees, which are one of the most unpopular pitfalls of the US healthcare system.