Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

T. Rowe Price New Income Fund, Inc.

Prospectus Date

rr_ProspectusDate

Oct. 01, 2018

Supplement to Prospectus [Text Block]

rr_SupplementToProspectusTextBlock

T. Rowe Price New Income Fund

Supplement to Summary Prospectus and Prospectus Dated October 1, 2018, as supplemented

On page 2, the first sentence under “Principal Investment Strategies” is replaced with the following:

The fund will invest at least 80% of its net assets in income-producing securities, which may include, but are not limited to, U.S. government and agency obligations, mortgage- and asset-backed securities (including commercial mortgage- backed securities), corporate bonds, foreign bonds, and Treasury inflation protected securities.

T. Rowe Price New Income Fund, Inc.

Risk/Return:

rr_RiskReturnAbstract

Supplement to Prospectus [Text Block]

rr_SupplementToProspectusTextBlock

T. Rowe Price New Income Fund

Supplement to Summary Prospectus and Prospectus Dated October 1, 2018, as supplemented

On page 2, the first sentence under “Principal Investment Strategies” is replaced with the following:

The fund will invest at least 80% of its net assets in income-producing securities, which may include, but are not limited to, U.S. government and agency obligations, mortgage- and asset-backed securities (including commercial mortgage- backed securities), corporate bonds, foreign bonds, and Treasury inflation protected securities.