v3.26.1
Average Annual Total Returns
 12 Months Ended 60 Months Ended 69 Months Ended 70 Months Ended 120 Months Ended 124 Months Ended 279 Months Ended 628 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
 [2]
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)                
Prospectus [Line Items]                
Average Annual Return, Percent 7.30% (0.36%)   0.38% [1] 2.01%      
Lipper Core Bond Funds Average                
Prospectus [Line Items]                
Average Annual Return, Percent 7.24% (0.28%) 1.57%   2.11%      
T. Rowe Price New Income Fund-Investor Class [Member]                
Prospectus [Line Items]                
Average Annual Return, Percent 7.08% (0.66%)     1.72%      
Performance Inception Date               Aug. 31, 1973
T. Rowe Price New Income Fund-Investor Class [Member] | After Taxes on Distributions                
Prospectus [Line Items]                
Average Annual Return, Percent 5.16% (2.05%)     0.41%      
T. Rowe Price New Income Fund-Investor Class [Member] | After Taxes on Distributions and Sales                
Prospectus [Line Items]                
Average Annual Return, Percent 4.16% (1.07%)     0.77%      
T. Rowe Price New Income Fund-I Class [Member]                
Prospectus [Line Items]                
Average Annual Return, Percent 7.04% (0.60%)            
Performance Inception Date           Aug. 28, 2015    
T. Rowe Price New Income Fund-I Class [Member] | After Taxes on Distributions and Sales                
Prospectus [Line Items]                
Average Annual Return, Percent         1.82%      
T. Rowe Price New Income Fund-Advisor Class [Member]                
Prospectus [Line Items]                
Average Annual Return, Percent 6.58% (1.13%)     1.33%      
Performance Inception Date             Sep. 30, 2002  
T. Rowe Price New Income Fund-R Class [Member]                
Prospectus [Line Items]                
Average Annual Return, Percent 6.27% (1.32%)     1.07%      
Performance Inception Date             Sep. 30, 2002  
T. Rowe Price New Income Fund-Z Class [Member]                
Prospectus [Line Items]                
Average Annual Return, Percent 7.42% (0.24%)   0.93%        
Performance Inception Date       Mar. 16, 2020        
[1] Return since 3/16/20.
[2] Return since 3/31/20.