Shareholder Report, Line Graph (Details) - USD ($)	12 Months Ended	36 Months Ended	84 Months Ended	96 Months Ended	120 Months Ended	132 Months Ended
	Mar. 31, 2026	Mar. 31, 2026	Mar. 31, 2026	Mar. 31, 2026	Mar. 31, 2026	Mar. 31, 2026
C000220379_LG_ClassMember_7YRMember
Account Value [Line Items]
Line Graph and Table Measure Name			<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Premier Class</span>
C000220379_ClassMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	$ 2,000,000,000
C000220379_ClassMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	2,570,322,474
C000220379_ClassMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	2,696,910,965
C000220379_ClassMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	2,506,886,552
C000220379_ClassMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	3,005,131,673
C000220379_ClassMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	3,206,138,060
C000220379_ClassMember_AsOf_2026Member
Account Value [Line Items]
Accumulated Value	3,842,642,899
C000220379_LG_1_AdditionalIndexMember_7YRMember
Account Value [Line Items]
Line Graph and Table Measure Name			<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity Freedom Index 2045 Composite Index℠</span>
C000220379_1_AdditionalIndexMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	2,000,000,000
C000220379_1_AdditionalIndexMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	2,564,930,037
C000220379_1_AdditionalIndexMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	2,702,697,201
C000220379_1_AdditionalIndexMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	2,504,186,394
C000220379_1_AdditionalIndexMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	3,008,574,171
C000220379_1_AdditionalIndexMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	3,205,600,618
C000220379_1_AdditionalIndexMember_AsOf_2026Member
Account Value [Line Items]
Accumulated Value	3,818,453,751
C000220379_LG_2_AdditionalIndexMember_7YRMember
Account Value [Line Items]
Line Graph and Table Measure Name			<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">S&P 500® Index</span>
C000220379_2_AdditionalIndexMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	2,000,000,000
C000220379_2_AdditionalIndexMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	2,637,300,930
C000220379_2_AdditionalIndexMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	3,049,927,469
C000220379_2_AdditionalIndexMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	2,814,215,574
C000220379_2_AdditionalIndexMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	3,655,135,424
C000220379_2_AdditionalIndexMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	3,956,745,967
C000220379_2_AdditionalIndexMember_AsOf_2026Member
Account Value [Line Items]
Accumulated Value	4,661,184,115
C000079285_LG_ClassMember_11YRMember
Account Value [Line Items]
Line Graph and Table Measure Name						<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Investor Class</span>
C000079285_ClassMember_AsOf_2016Member
Account Value [Line Items]
Accumulated Value	10,000
C000079285_ClassMember_AsOf_2017Member
Account Value [Line Items]
Accumulated Value	11,307
C000079285_ClassMember_AsOf_2018Member
Account Value [Line Items]
Accumulated Value	12,590
C000079285_ClassMember_AsOf_2019Member
Account Value [Line Items]
Accumulated Value	13,183
C000079285_ClassMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	12,606
C000079285_ClassMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	17,063
C000079285_ClassMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	17,484
C000079285_ClassMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	16,322
C000079285_ClassMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	18,512
C000079285_ClassMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	19,613
C000079285_ClassMember_AsOf_2026Member
Account Value [Line Items]
Accumulated Value	22,319
C000079285_LG_1_AdditionalIndexMember_11YRMember
Account Value [Line Items]
Line Graph and Table Measure Name						<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity Freedom Index 2030 Composite Index℠</span>
C000079285_1_AdditionalIndexMember_AsOf_2016Member
Account Value [Line Items]
Accumulated Value	10,000
C000079285_1_AdditionalIndexMember_AsOf_2017Member
Account Value [Line Items]
Accumulated Value	11,313
C000079285_1_AdditionalIndexMember_AsOf_2018Member
Account Value [Line Items]
Accumulated Value	12,607
C000079285_1_AdditionalIndexMember_AsOf_2019Member
Account Value [Line Items]
Accumulated Value	13,236
C000079285_1_AdditionalIndexMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	12,667
C000079285_1_AdditionalIndexMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	17,175
C000079285_1_AdditionalIndexMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	17,667
C000079285_1_AdditionalIndexMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	16,472
C000079285_1_AdditionalIndexMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	18,721
C000079285_1_AdditionalIndexMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	19,828
C000079285_1_AdditionalIndexMember_AsOf_2026Member
Account Value [Line Items]
Accumulated Value	22,504
C000079285_LG_2_AdditionalIndexMember_11YRMember
Account Value [Line Items]
Line Graph and Table Measure Name						<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">S&P 500® Index</span>
C000079285_2_AdditionalIndexMember_AsOf_2016Member
Account Value [Line Items]
Accumulated Value	10,000
C000079285_2_AdditionalIndexMember_AsOf_2017Member
Account Value [Line Items]
Accumulated Value	11,717
C000079285_2_AdditionalIndexMember_AsOf_2018Member
Account Value [Line Items]
Accumulated Value	13,357
C000079285_2_AdditionalIndexMember_AsOf_2019Member
Account Value [Line Items]
Accumulated Value	14,625
C000079285_2_AdditionalIndexMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	13,605
C000079285_2_AdditionalIndexMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	21,271
C000079285_2_AdditionalIndexMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	24,599
C000079285_2_AdditionalIndexMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	22,698
C000079285_2_AdditionalIndexMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	29,480
C000079285_2_AdditionalIndexMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	31,913
C000079285_2_AdditionalIndexMember_AsOf_2026Member
Account Value [Line Items]
Accumulated Value	37,594
C000157958_LG_ClassMember_11YRMember
Account Value [Line Items]
Line Graph and Table Measure Name						<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Institutional Premium Class</span>
C000157958_ClassMember_AsOf_2016Member
Account Value [Line Items]
Accumulated Value	5,000,000
C000157958_ClassMember_AsOf_2017Member
Account Value [Line Items]
Accumulated Value	5,744,061
C000157958_ClassMember_AsOf_2018Member
Account Value [Line Items]
Accumulated Value	6,502,316
C000157958_ClassMember_AsOf_2019Member
Account Value [Line Items]
Accumulated Value	6,800,587
C000157958_ClassMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	6,194,542
C000157958_ClassMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	9,289,610
C000157958_ClassMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	9,747,286
C000157958_ClassMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	9,054,700
C000157958_ClassMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	10,857,981
C000157958_ClassMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	11,579,297
C000157958_ClassMember_AsOf_2026Member
Account Value [Line Items]
Accumulated Value	13,872,032
C000157958_LG_1_AdditionalIndexMember_11YRMember
Account Value [Line Items]
Line Graph and Table Measure Name						<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity Freedom Index 2050 Composite Index℠</span>
C000157958_1_AdditionalIndexMember_AsOf_2016Member
Account Value [Line Items]
Accumulated Value	5,000,000
C000157958_1_AdditionalIndexMember_AsOf_2017Member
Account Value [Line Items]
Accumulated Value	5,744,852
C000157958_1_AdditionalIndexMember_AsOf_2018Member
Account Value [Line Items]
Accumulated Value	6,502,455
C000157958_1_AdditionalIndexMember_AsOf_2019Member
Account Value [Line Items]
Accumulated Value	6,815,663
C000157958_1_AdditionalIndexMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	6,216,827
C000157958_1_AdditionalIndexMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	9,325,593
C000157958_1_AdditionalIndexMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	9,826,488
C000157958_1_AdditionalIndexMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	9,104,741
C000157958_1_AdditionalIndexMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	10,938,598
C000157958_1_AdditionalIndexMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	11,654,949
C000157958_1_AdditionalIndexMember_AsOf_2026Member
Account Value [Line Items]
Accumulated Value	13,877,587
C000157958_LG_2_AdditionalIndexMember_11YRMember
Account Value [Line Items]
Line Graph and Table Measure Name						<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">S&P 500® Index</span>
C000157958_2_AdditionalIndexMember_AsOf_2016Member
Account Value [Line Items]
Accumulated Value	5,000,000
C000157958_2_AdditionalIndexMember_AsOf_2017Member
Account Value [Line Items]
Accumulated Value	5,858,613
C000157958_2_AdditionalIndexMember_AsOf_2018Member
Account Value [Line Items]
Accumulated Value	6,678,339
C000157958_2_AdditionalIndexMember_AsOf_2019Member
Account Value [Line Items]
Accumulated Value	7,312,547
C000157958_2_AdditionalIndexMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	6,802,284
C000157958_2_AdditionalIndexMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	10,635,483
C000157958_2_AdditionalIndexMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	12,299,488
C000157958_2_AdditionalIndexMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	11,348,929
C000157958_2_AdditionalIndexMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	14,740,119
C000157958_2_AdditionalIndexMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	15,956,429
C000157958_2_AdditionalIndexMember_AsOf_2026Member
Account Value [Line Items]
Accumulated Value	18,797,227
C000157968_LG_ClassMember_11YRMember
Account Value [Line Items]
Line Graph and Table Measure Name						<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Institutional Premium Class</span>
C000157968_ClassMember_AsOf_2016Member
Account Value [Line Items]
Accumulated Value	5,000,000
C000157968_ClassMember_AsOf_2017Member
Account Value [Line Items]
Accumulated Value	5,749,114
C000157968_ClassMember_AsOf_2018Member
Account Value [Line Items]
Accumulated Value	6,504,209
C000157968_ClassMember_AsOf_2019Member
Account Value [Line Items]
Accumulated Value	6,804,286
C000157968_ClassMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	6,201,899
C000157968_ClassMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	9,294,763
C000157968_ClassMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	9,752,160
C000157968_ClassMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	9,062,962
C000157968_ClassMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	10,864,344
C000157968_ClassMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	11,588,274
C000157968_ClassMember_AsOf_2026Member
Account Value [Line Items]
Accumulated Value	13,875,254
C000157968_LG_1_AdditionalIndexMember_11YRMember
Account Value [Line Items]
Line Graph and Table Measure Name						<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity Freedom Index 2055 Composite Index℠</span>
C000157968_1_AdditionalIndexMember_AsOf_2016Member
Account Value [Line Items]
Accumulated Value	5,000,000
C000157968_1_AdditionalIndexMember_AsOf_2017Member
Account Value [Line Items]
Accumulated Value	5,744,852
C000157968_1_AdditionalIndexMember_AsOf_2018Member
Account Value [Line Items]
Accumulated Value	6,502,455
C000157968_1_AdditionalIndexMember_AsOf_2019Member
Account Value [Line Items]
Accumulated Value	6,815,663
C000157968_1_AdditionalIndexMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	6,216,827
C000157968_1_AdditionalIndexMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	9,325,593
C000157968_1_AdditionalIndexMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	9,826,488
C000157968_1_AdditionalIndexMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	9,104,741
C000157968_1_AdditionalIndexMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	10,938,598
C000157968_1_AdditionalIndexMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	11,654,949
C000157968_1_AdditionalIndexMember_AsOf_2026Member
Account Value [Line Items]
Accumulated Value	13,872,872
C000157968_LG_2_AdditionalIndexMember_11YRMember
Account Value [Line Items]
Line Graph and Table Measure Name						<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">S&P 500® Index</span>
C000157968_2_AdditionalIndexMember_AsOf_2016Member
Account Value [Line Items]
Accumulated Value	5,000,000
C000157968_2_AdditionalIndexMember_AsOf_2017Member
Account Value [Line Items]
Accumulated Value	5,858,613
C000157968_2_AdditionalIndexMember_AsOf_2018Member
Account Value [Line Items]
Accumulated Value	6,678,339
C000157968_2_AdditionalIndexMember_AsOf_2019Member
Account Value [Line Items]
Accumulated Value	7,312,547
C000157968_2_AdditionalIndexMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	6,802,284
C000157968_2_AdditionalIndexMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	10,635,483
C000157968_2_AdditionalIndexMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	12,299,488
C000157968_2_AdditionalIndexMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	11,348,929
C000157968_2_AdditionalIndexMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	14,740,119
C000157968_2_AdditionalIndexMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	15,956,429
C000157968_2_AdditionalIndexMember_AsOf_2026Member
Account Value [Line Items]
Accumulated Value	18,797,227
C000220389_LG_ClassMember_7YRMember
Account Value [Line Items]
Line Graph and Table Measure Name			<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Premier Class</span>
C000220389_ClassMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	2,000,000,000
C000220389_ClassMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	2,569,839,744
C000220389_ClassMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	2,696,838,733
C000220389_ClassMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	2,504,546,715
C000220389_ClassMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	2,980,616,147
C000220389_ClassMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	3,177,272,104
C000220389_ClassMember_AsOf_2026Member
Account Value [Line Items]
Accumulated Value	3,759,915,206
C000220389_LG_1_AdditionalIndexMember_7YRMember
Account Value [Line Items]
Line Graph and Table Measure Name			<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity Freedom Index 2040 Composite Index℠</span>
C000220389_1_AdditionalIndexMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	2,000,000,000
C000220389_1_AdditionalIndexMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	2,564,930,037
C000220389_1_AdditionalIndexMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	2,702,142,363
C000220389_1_AdditionalIndexMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	2,502,592,539
C000220389_1_AdditionalIndexMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	2,983,837,130
C000220389_1_AdditionalIndexMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	3,176,624,452
C000220389_1_AdditionalIndexMember_AsOf_2026Member
Account Value [Line Items]
Accumulated Value	3,739,194,613
C000220389_LG_2_AdditionalIndexMember_7YRMember
Account Value [Line Items]
Line Graph and Table Measure Name			<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">S&P 500® Index</span>
C000220389_2_AdditionalIndexMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	2,000,000,000
C000220389_2_AdditionalIndexMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	2,637,300,930
C000220389_2_AdditionalIndexMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	3,049,927,469
C000220389_2_AdditionalIndexMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	2,814,215,574
C000220389_2_AdditionalIndexMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	3,655,135,424
C000220389_2_AdditionalIndexMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	3,956,745,967
C000220389_2_AdditionalIndexMember_AsOf_2026Member
Account Value [Line Items]
Accumulated Value	4,661,184,115
C000177888_LG_ClassMember_10YRMember
Account Value [Line Items]
Line Graph and Table Measure Name					<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity Flex® Freedom Blend 2040 Fund</span>
C000177888_ClassMember_AsOf_2017Member
Account Value [Line Items]
Accumulated Value	10,000
C000177888_ClassMember_AsOf_2018Member
Account Value [Line Items]
Accumulated Value	10,989
C000177888_ClassMember_AsOf_2019Member
Account Value [Line Items]
Accumulated Value	11,271
C000177888_ClassMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	10,114
C000177888_ClassMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	15,831
C000177888_ClassMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	16,450
C000177888_ClassMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	15,370
C000177888_ClassMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	18,522
C000177888_ClassMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	19,628
C000177888_ClassMember_AsOf_2026Member
Account Value [Line Items]
Accumulated Value	23,665
C000177888_LG_1_AdditionalIndexMember_10YRMember
Account Value [Line Items]
Line Graph and Table Measure Name					<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity Freedom 2040 Composite Index℠</span>
C000177888_1_AdditionalIndexMember_AsOf_2017Member
Account Value [Line Items]
Accumulated Value	10,000
C000177888_1_AdditionalIndexMember_AsOf_2018Member
Account Value [Line Items]
Accumulated Value	10,910
C000177888_1_AdditionalIndexMember_AsOf_2019Member
Account Value [Line Items]
Accumulated Value	11,449
C000177888_1_AdditionalIndexMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	10,443
C000177888_1_AdditionalIndexMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	15,666
C000177888_1_AdditionalIndexMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	16,504
C000177888_1_AdditionalIndexMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	15,285
C000177888_1_AdditionalIndexMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	18,224
C000177888_1_AdditionalIndexMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	19,402
C000177888_1_AdditionalIndexMember_AsOf_2026Member
Account Value [Line Items]
Accumulated Value	22,838
C000177888_LG_2_AdditionalIndexMember_10YRMember
Account Value [Line Items]
Line Graph and Table Measure Name					<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">S&P 500® Index</span>
C000177888_2_AdditionalIndexMember_AsOf_2017Member
Account Value [Line Items]
Accumulated Value	10,000
C000177888_2_AdditionalIndexMember_AsOf_2018Member
Account Value [Line Items]
Accumulated Value	11,022
C000177888_2_AdditionalIndexMember_AsOf_2019Member
Account Value [Line Items]
Accumulated Value	12,068
C000177888_2_AdditionalIndexMember_AsOf_2020Member
Account Value [Line Items]
Accumulated Value	11,226
C000177888_2_AdditionalIndexMember_AsOf_2021Member
Account Value [Line Items]
Accumulated Value	17,552
C000177888_2_AdditionalIndexMember_AsOf_2022Member
Account Value [Line Items]
Accumulated Value	20,299
C000177888_2_AdditionalIndexMember_AsOf_2023Member
Account Value [Line Items]
Accumulated Value	18,730
C000177888_2_AdditionalIndexMember_AsOf_2024Member
Account Value [Line Items]
Accumulated Value	24,326
C000177888_2_AdditionalIndexMember_AsOf_2025Member
Account Value [Line Items]
Accumulated Value	26,334
C000177888_2_AdditionalIndexMember_AsOf_2026Member
Account Value [Line Items]
Accumulated Value	31,022
C000177881_LG_ClassMember_10YRMember
Account Value [Line Items]
Line Graph and Table Measure Name					<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity Flex® Freedom Blend Retirement Fund</span>
C000177881_ClassMember_AsOf_2017Member
Account Value [Line Items]
Accumulated Value	10,000
C000177881_ClassMember_AsOf_2018Member
Account Value [Line Items]
Accumulated Value	10,314
C000177881_ClassMember_AsOf_2019Member
Account Value [Line Items]
Accumulated Value	10,689
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