Shareholder Report, Line Graph (Details) - USD ($) |
12 Months Ended | 24 Months Ended | 36 Months Ended | 48 Months Ended | 60 Months Ended | 72 Months Ended | 84 Months Ended | 96 Months Ended | 108 Months Ended | 120 Months Ended | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
May 31, 2015 |
May 31, 2025 |
May 31, 2016 |
May 31, 2017 |
May 31, 2018 |
May 31, 2019 |
May 31, 2020 |
May 31, 2021 |
May 31, 2022 |
May 31, 2023 |
May 31, 2024 |
May 31, 2025 |
|
| C000001854 [Member] | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bond Fund (Class A/JHNBX) | |||||||||||
| Accumulated Value | $ 9,600 | $ 9,752.377344 | $ 10,149.490834 | $ 10,138.547146 | $ 10,780.184467 | $ 11,558.421076 | $ 12,000.694234 | $ 10,933.797595 | $ 10,642.942069 | $ 10,892.738199 | $ 11,472.534036 | |
| C000001856 [Member] | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bond Fund (Class C/JHCBX) | |||||||||||
| Accumulated Value | 10,000 | 10,087.8586 | 10,425.666988 | 10,341.81314 | 10,926.800179 | 11,626.951072 | 11,987.605607 | 10,845.49883 | 10,483.179346 | 10,654.449337 | 11,143.441043 | |
| C000001857 [Member] | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bond Fund (Class I/JHBIX) | |||||||||||
| Accumulated Value | 250,000 | 254,919.675 | 265,960.243575 | 266,440.93214 | 284,282.323194 | 305,519.946859 | 318,354.635128 | 290,948.388717 | 283,860.612476 | 291,390.290567 | 307,815.96416 | |
| C000153977 [Member] | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bond Fund (Class NAV) | |||||||||||
| Accumulated Value | 10,000 | 10,193.7573 | 10,653.563747 | 10,684.820344 | 11,414.451893 | 12,281.913596 | 12,812.770203 | 11,724.986641 | 11,445.378071 | 11,771.881401 | 12,449.48867 | |
| C000113488 [Member] | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bond Fund (Class R2/JHRBX) | |||||||||||
| Accumulated Value | 10,000 | 10,154.6009 | 10,558.169009 | 10,528.727977 | 11,190.86873 | 11,987.720693 | 12,434.597986 | 11,320.04294 | 11,002.503623 | 11,259.754591 | 11,839.459453 | |
| C000153978 [Member] | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bond Fund (Class R4/JBFRX) | |||||||||||
| Accumulated Value | 10,000 | 10,185.7564 | 10,618.736302 | 10,622.531438 | 11,318.403487 | 12,147.134727 | 12,639.305408 | 11,536.688805 | 11,232.540156 | 11,523.62593 | 12,156.293736 | |
| C000106442 [Member] | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bond Fund (Class R6/JHBSX) | |||||||||||
| Accumulated Value | 1,000,000 | 1,020,226.97 | 1,066,913.127474 | 1,069,291.351519 | 1,142,162.883471 | 1,229,545.174191 | 1,281,752.203287 | 1,172,824.325196 | 1,145,592.423363 | 1,178,226.82308 | 1,245,046.222372 | |
| Bloomberg U S Aggregate Bond Index [Member] | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index | |||||||||||
| Accumulated Value | 10,000 | 10,299.486 | 10,462.052263 | 10,422.858486 | 11,089.980214 | 12,134.163068 | 12,085.036574 | 11,091.399912 | 10,853.732729 | 10,995.431574 | 11,595.662288 | |
| Bloomberg U S Aggregate Bond C000001857 Index [Member] | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Accumulated Value | 250,000 | 257,487.15 | 261,551.306577 | 260,571.462148 | 277,249.505349 | 303,354.076695 | 302,125.914347 | 277,284.997798 | 271,343.318228 | 274,885.789364 | 289,891.557208 | |
| Bloomberg U S Aggregate Bond C000106442 Index [Member] | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Accumulated Value | $ 1,000,000 | $ 1,029,948.6 | $ 1,046,205.226307 | $ 1,042,285.848592 | $ 1,108,998.021394 | $ 1,213,416.306777 | $ 1,208,503.657383 | $ 1,109,139.991186 | $ 1,085,373.272906 | $ 1,099,543.15745 | $ 1,159,566.228826 | |