v3.25.1
Shareholder Report, Line Graph (Details) - USD ($)
 6 Months Ended
Feb. 28, 2025
Aug. 31, 2024
Aug. 31, 2023
Aug. 31, 2022
Dec. 14, 2021
Aug. 31, 2021
Aug. 31, 2020
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2015
Feb. 28, 2015
C000029018                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Advisor Class                        
Account Value $ 14,841 $ 14,551 $ 12,626 $ 12,317   $ 14,770 $ 12,164 $ 11,963 $ 11,267 $ 11,044 $ 10,042 $ 9,537 $ 10,000
C000029015                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Class A (with sales charges)                        
Account Value $ 13,848 13,601 11,831 11,570   13,914 11,484 11,321 10,692 10,503 9,582 9,115 9,574
C000029017                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Class C (with sales charges)                        
Account Value $ 13,417 13,225 11,586 11,422   13,845 11,506 11,429 10,880 10,771 9,896 9,487 10,000
C000029021                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Class I                        
Account Value $ 14,913 14,629 12,262 12,293   14,748 12,144 11,947 11,252 11,035 10,039 9,535 10,000
C000029007                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Advisor Class                        
Account Value $ 13,239 13,815 12,086 11,209   13,635 11,773 11,540 11,010 10,753 10,130 9,730 10,000
C000029004                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Class A (with sales charges)                        
Account Value $ 12,343 12,909 11,318 10,519   12,834 11,108 10,915 10,448 10,229 9,657 9,298 9,573
C000029006                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Class C (with sales charges)                        
Account Value $ 11,948 12,534 11,084 10,373   12,764 11,134 11,026 10,630 10,487 9,976 9,677 10,000
C000029010                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Class I                        
Account Value $ 13,220 13,800 12,067 11,181   13,607 11,749 11,517 10,998 10,746 10,129 9,729 10,000
C000232929                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Class Z                        
Account Value $ 9,881 10,323 9,025 8,373 $ 10,000                
C000029036                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Advisor Class                        
Account Value $ 22,728 22,008 17,560 15,638   18,589 14,283 12,664 12,849 11,430 9,916 9,399 10,000
C000029033                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Class A (with sales charges)                        
Account Value $ 21,228 20,573 16,457 14,695   17,510 13,487 11,995 12,198 10,878 9,461 8,991 9,574
C000029035                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Class C (with sales charges)                        
Account Value $ 20,552 20,001 16,117 14,504   17,419 13,519 12,111 12,411 11,150 9,773 9,358 10,000
C000029029                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Advisor Class                        
Account Value $ 22,835 22,021 17,513 15,567   18,503 14,154 12,517 12,706 11,300 9,855 9,402 10,000
C000029026                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Class A (with sales charges)                        
Account Value $ 21,316 20,592 16,412 14,626   17,432 13,367 11,846 12,060 10,748 9,400 8,993 9,576
C000029028                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Class C (with sales charges)                        
Account Value $ 20,642 20,013 16,077 14,438   17,332 13,395 11,962 12,264 11,018 9,711 9,355 10,000
AllianceBernstein Index: MSCI ACWI Index (net)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name MSCI ACWI Index (net)                        
Account Value $ 23,908 22,971 18,609 16,331   19,415 15,092 12,952 12,988 11,658 9,954 9,282 10,000
AllianceBernstein Index: MSCI ACWI Index (net)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name MSCI ACWI Index (net)                        
Account Value $ 23,908 22,971 18,609 16,331   19,415 15,092 12,952 12,988 11,658 9,954 9,282 10,000
AllianceBernstein Index: MSCI ACWI Index (net)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name MSCI ACWI Index (net)                        
Account Value $ 23,908 22,971 18,609 16,331   19,415 15,092 12,952 12,988 11,658 9,954 9,282 10,000
AllianceBernstein Index: MSCI ACWI Index (net)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name MSCI ACWI Index (net)                        
Account Value $ 23,908 22,971 18,609 16,331   19,415 15,092 12,952 12,988 11,658 9,954 9,282 10,000
AllianceBernstein Index: S&P 500 Index                          
Account Value [Line Items]                          
Line Graph and Table Measure Name S&P 500 Index                        
Account Value $ 33,877 31,927 25,113 21,659   24,399 18,601 15,255 14,822 12,387 10,657 9,468 10,000
AllianceBernstein Index: S&P 500 Index                          
Account Value [Line Items]                          
Line Graph and Table Measure Name S&P 500 Index                        
Account Value $ 33,877 31,927 25,113 21,659   24,399 18,601 15,255 14,822 12,387 10,657 9,468 10,000
AllianceBernstein Index: S&P 500 Index                          
Account Value [Line Items]                          
Line Graph and Table Measure Name S&P 500 Index                        
Account Value $ 33,877 31,927 25,113 21,659   24,399 18,601 15,255 14,822 12,387 10,657 9,468 10,000
AllianceBernstein Index: S&P 500 Index                          
Account Value [Line Items]                          
Line Graph and Table Measure Name S&P 500 Index                        
Account Value $ 33,877 31,927 25,113 21,659   24,399 18,601 15,255 14,822 12,387 10,657 9,468 10,000
AllianceBernstein Index: S&P 500 Index                          
Account Value [Line Items]                          
Line Graph and Table Measure Name S&P 500 Index                        
Account Value $ 13,496 12,720 10,005 8,629 10,000                
AllianceBernstein Index: MSCI ACWI Index (net)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name MSCI ACWI Index (net)                        
Account Value $ 23,908 22,971 18,609 16,331   19,415 15,092 12,952 12,988 11,658 9,954 9,282 10,000
AllianceBernstein Index: MSCI ACWI Index (net)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name MSCI ACWI Index (net)                        
Account Value $ 23,908 22,971 18,609 16,331   19,415 15,092 12,952 12,988 11,658 9,954 9,282 10,000
AllianceBernstein Index: MSCI ACWI Index (net)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name MSCI ACWI Index (net)                        
Account Value $ 23,908 22,971 18,609 16,331   19,415 15,092 12,952 12,988 11,658 9,954 9,282 10,000
AllianceBernstein Index: MSCI ACWI Index (net)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name MSCI ACWI Index (net)                        
Account Value $ 23,908 22,971 18,609 16,331   19,415 15,092 12,952 12,988 11,658 9,954 9,282 10,000
AllianceBernstein Index: MSCI ACWI Index (net)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name MSCI ACWI Index (net)                        
Account Value $ 23,908 22,971 18,609 16,331   19,415 15,092 12,952 12,988 11,658 9,954 9,282 10,000
AllianceBernstein Index: MSCI ACWI Index (net)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name MSCI ACWI Index (net)                        
Account Value $ 23,908 22,971 18,609 16,331   19,415 15,092 12,952 12,988 11,658 9,954 9,282 10,000
AllianceBernstein Index: Bloomberg Global Aggregate Bond Index (USD hedged)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Bloomberg Global Aggregate Bond Index (USD hedged)                        
Account Value $ 12,241 12,024 11,187 11,126   12,361 12,269 11,880 10,728 10,649 10,619 9,907 10,000
AllianceBernstein Index: Bloomberg Global Aggregate Bond Index (USD hedged)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Bloomberg Global Aggregate Bond Index (USD hedged)                        
Account Value $ 12,241 12,024 11,187 11,126   12,361 12,269 11,880 10,728 10,649 10,619 9,907 10,000
AllianceBernstein Index: Bloomberg Global Aggregate Bond Index (USD hedged)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Bloomberg Global Aggregate Bond Index (USD hedged)                        
Account Value $ 12,241 12,024 11,187 11,126   12,361 12,269 11,880 10,728 10,649 10,619 9,907 10,000
AllianceBernstein Index: Bloomberg Global Aggregate Bond Index (USD hedged)                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Bloomberg Global Aggregate Bond Index (USD hedged)                        
Account Value $ 12,241 12,024 11,187 11,126   12,361 12,269 11,880 10,728 10,649 10,619 9,907 10,000
Alliance Bernstein Index: 60% S&P 500 Index / 40% Bloomberg US Government/Credit Index                          
Account Value [Line Items]                          
Line Graph and Table Measure Name 60% S&P 500 Index / 40% Bloomberg US Government/Credit Index                        
Account Value $ 22,734 21,853 18,379 16,833   18,993 16,108 13,824 12,955 11,676 10,645 9,639 10,000
Alliance Bernstein Index: 60% S&P 500 Index / 40% Bloomberg US Government/Credit Index                          
Account Value [Line Items]                          
Line Graph and Table Measure Name 60% S&P 500 Index / 40% Bloomberg US Government/Credit Index                        
Account Value $ 22,734 21,853 18,379 16,833   18,993 16,108 13,824 12,955 11,676 10,645 9,639 10,000
Alliance Bernstein Index: 60% S&P 500 Index / 40% Bloomberg US Government/Credit Index                          
Account Value [Line Items]                          
Line Graph and Table Measure Name 60% S&P 500 Index / 40% Bloomberg US Government/Credit Index                        
Account Value $ 22,734 21,853 18,379 16,833   18,993 16,108 13,824 12,955 11,676 10,645 9,639 10,000
Alliance Bernstein Index: 60% S&P 500 Index / 40% Bloomberg US Government/Credit Index                          
Account Value [Line Items]                          
Line Graph and Table Measure Name 60% S&P 500 Index / 40% Bloomberg US Government/Credit Index                        
Account Value $ 22,734 21,853 18,379 16,833   $ 18,993 $ 16,108 $ 13,824 $ 12,955 $ 11,676 $ 10,645 $ 9,639 $ 10,000
Alliance Bernstein Index: 60% S&P 500 Index / 40% Bloomberg US Government/Credit Index                          
Account Value [Line Items]                          
Line Graph and Table Measure Name 60% S&P 500 Index / 40% Bloomberg US Government/Credit Index                        
Account Value $ 11,795 $ 11,337 $ 9,535 $ 8,733 $ 10,000