Shareholder Fees {- Fidelity Advisor Mortgage Securities Fund} - 08.31 Fidelity Advisor Mortgage Securities Fund AMCIZ PRO-14 - Fidelity Advisor Mortgage Securities Fund	Oct. 29, 2022
Fidelity Advisor Mortgage Securities Fund: Class A
Shareholder Fees:
Maximum sales charge (load) on purchases (as a % of offering price)	4.00%
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)	none	[1]
Fidelity Advisor Mortgage Securities Fund: Class M
Shareholder Fees:
Maximum sales charge (load) on purchases (as a % of offering price)	4.00%
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)	none	[1]
Fidelity Advisor Mortgage Securities Fund: Class C
Shareholder Fees:
Maximum sales charge (load) on purchases (as a % of offering price)	none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)	1.00%	[2]
Fidelity Advisor Mortgage Securities Fund: Class I
Shareholder Fees:
Maximum sales charge (load) on purchases (as a % of offering price)	none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)	none
Fidelity Advisor Mortgage Securities Fund: Class Z
Shareholder Fees:
Maximum sales charge (load) on purchases (as a % of offering price)	none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)	none

[1] ^(a)Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 0.75% or 0.25%, respectively.

[2] ^(b)On Class C shares redeemed less than one year after purchase.