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Shareholder Report, Line Graph (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Apr. 27, 2015
Dec. 31, 2014
C000098721                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Class A                      
Account Value $ 14,905 $ 13,470 $ 11,847 $ 14,527 $ 13,246 $ 12,612 $ 10,919 $ 11,749 $ 10,246 $ 9,891   $ 10,000
C000098722                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Class B                      
Account Value $ 14,542 13,169 11,605 14,270 13,059 12,453 10,807 11,663 10,202 9,870   10,000
C000154814                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Class B                      
Account Value $ 15,466 13,775 12,000 13,964 12,471 12,172 10,375 10,903 9,778 9,380 $ 10,000  
C000028852                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Class A                      
Account Value $ 17,003 15,623 13,821 17,060 15,001 13,711 11,567 12,328 10,642 10,165   10,000
C000028853                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Class B                      
Account Value $ 16,571 15,262 13,547 16,760 14,784 13,532 11,448 12,232 10,579 10,129   10,000
C000028862                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Class A                      
Account Value $ 25,145 22,247 19,859 20,728 16,174 15,745 12,707 13,462 11,319 10,170   10,000
C000028863                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Class B                      
Account Value $ 24,528 21,752 19,470 20,370 15,934 15,550 12,580 13,360 11,265 10,143   10,000
C000028828                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Class A                      
Account Value $ 13,774 13,110 11,386 13,179 11,864 11,579 9,885 12,802 10,208 10,259   10,000
C000028829                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Class B                      
Account Value $ 13,438 12,821 11,165 12,952 11,684 11,431 9,788 12,708 10,158 10,240   10,000
C000028830                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Class A                      
Account Value $ 43,969 35,104 25,978 36,338 28,175 20,796 15,439 15,051 11,403 11,111   10,000
C000028831                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Class B                      
Account Value $ 42,893 34,327 25,468 35,713 27,760 20,540 15,287 14,940 11,346 11,085   10,000
C000028836                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Class A                      
Account Value $ 27,399 23,094 19,568 32,128 29,352 19,062 13,975 14,101 10,513 9,875   10,000
C000028837                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Class B                      
Account Value $ 26,739 22,576 19,176 31,573 28,913 18,819 13,837 13,991 10,459 9,847   10,000
C000028838                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Class A                      
Account Value $ 20,866 18,966 16,185 19,183 14,111 13,651 11,367 13,377 11,823 9,451   10,000
C000028839                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Class B                      
Account Value $ 20,346 18,544 15,868 18,850 13,900 13,489 11,250 13,281 11,769 9,431   10,000
C000028860                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Class A                      
Account Value $ 25,283 23,805 20,520 28,103 22,872 16,406 12,605 13,974 10,225 10,289   10,000
C000028861                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Class B                      
Account Value $ 24,662 23,274 20,116 27,619 22,533 16,201 12,484 13,868 10,175 10,265   10,000
AllianceBernstein Index: MSCI World Index                        
Account Value [Line Items]                        
Line Graph and Table Measure Name MSCI World Index (net)                      
Account Value $ 25,812 21,751 17,571 21,465 17,621 15,203 11,908 13,045 10,657 9,913   10,000
AllianceBernstein Index: MSCI World Index                        
Account Value [Line Items]                        
Line Graph and Table Measure Name MSCI World Index (net)                      
Account Value $ 25,812 21,751 17,571 21,465 17,621 15,203 11,908 13,045 10,657 9,913   10,000
AllianceBernstein Index: MSCI World Index (net, USD Hedged)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name MSCI World Index (net, USD Hedged)                      
Account Value $ 26,997 22,153 17,822 21,062 16,933 14,819 11,539 12,353 10,369 9,479 10,000  
AllianceBernstein Index: MSCI ACWI Index (net)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name MSCI ACWI Index (net)                      
Account Value $ 24,183 20,584 16,844 20,633 17,406 14,973 11,827 13,056 10,531 9,764   10,000
AllianceBernstein Index: MSCI ACWI Index (net)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name MSCI ACWI Index (net)                      
Account Value $ 24,183 20,584 16,844 20,633 17,406 14,973 11,827 13,056 10,531 9,764   10,000
AllianceBernstein Index: S&P 500 Index                        
Account Value [Line Items]                        
Line Graph and Table Measure Name S&P 500 Index                      
Account Value $ 34,254 27,399 21,696 26,494 20,585 17,386 13,223 13,829 11,351 10,138   10,000
AllianceBernstein Index: S&P 500 Index                        
Account Value [Line Items]                        
Line Graph and Table Measure Name S&P 500 Index                      
Account Value $ 34,254 27,399 21,696 26,494 20,585 17,386 13,223 13,829 11,351 10,138   10,000
AllianceBernstein Index: MSCI EAFE Index (net)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name MSCI EAFE Index (net)                      
Account Value $ 16,598 15,987 13,521 15,805 14,205 13,176 10,798 12,526 10,018 9,919   10,000
AllianceBernstein Index: MSCI EAFE Index (net)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name MSCI EAFE Index (net)                      
Account Value $ 16,598 15,987 13,521 15,805 14,205 13,176 10,798 12,526 10,018 9,919   10,000
AllianceBernstein Index: S&P 500 Index                        
Account Value [Line Items]                        
Line Graph and Table Measure Name S&P 500 Index                      
Account Value $ 34,254 27,399 21,696 26,494 20,585 17,386 13,223 13,829 11,351 10,138   10,000
AllianceBernstein Index: S&P 500 Index                        
Account Value [Line Items]                        
Line Graph and Table Measure Name S&P 500 Index                      
Account Value $ 34,254 27,399 21,696 26,494 20,585 17,386 13,223 13,829 11,351 10,138   10,000
AllianceBernstein Index: S&P 500 Index                        
Account Value [Line Items]                        
Line Graph and Table Measure Name S&P 500 Index                      
Account Value $ 34,254 27,399 21,696 26,494 20,585 17,386 13,223 13,829 11,351 10,138   10,000
AllianceBernstein Index: S&P 500 Index                        
Account Value [Line Items]                        
Line Graph and Table Measure Name S&P 500 Index                      
Account Value $ 34,254 27,399 21,696 26,494 20,585 17,386 13,223 13,829 11,351 10,138   10,000
AllianceBernstein Index: S&P 500 Index                        
Account Value [Line Items]                        
Line Graph and Table Measure Name S&P 500 Index                      
Account Value $ 34,254 27,399 21,696 26,494 20,585 17,386 13,223 13,829 11,351 10,138   10,000
AllianceBernstein Index: S&P 500 Index                        
Account Value [Line Items]                        
Line Graph and Table Measure Name S&P 500 Index                      
Account Value $ 34,254 27,399 21,696 26,494 20,585 17,386 13,223 13,829 11,351 10,138   10,000
AllianceBernstein Index: MSCI ACWI Index (net)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name MSCI ACWI Index (net)                      
Account Value $ 24,183 20,584 16,844 20,633 17,406 14,973 11,827 13,056 10,531 9,764   10,000
AllianceBernstein Index: MSCI ACWI Index (net)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name MSCI ACWI Index (net)                      
Account Value $ 24,183 20,584 16,844 20,633 17,406 14,973 11,827 13,056 10,531 9,764   10,000
AllianceBernstein Index: Blended Benchmark: 60% MSCI World Index/ 40% Bloomberg US Treasury Index                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Blended Benchmark: 60% MSCI World Index/ 40% Bloomberg US Treasury Index                      
Account Value $ 18,779 16,893 14,607 17,304 15,492 13,617 11,420 11,987 10,516 10,008   10,000
AllianceBernstein Index: Bloomberg US Treasury Index                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Bloomberg U.S. Treasury Index                      
Account Value $ 10,858 10,795 10,375 11,852 12,134 11,235 10,514 10,424 10,189 10,084   10,000
AllianceBernstein Index: Blended Benchmark: 60% MSCI World Index/ 40% Bloomberg US Treasury Index                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Blended Benchmark: 60% MSCI World Index/ 40% Bloomberg US Treasury Index                      
Account Value $ 18,779 16,893 14,607 17,304 15,492 13,617 11,420 11,987 10,516 10,008   10,000
AllianceBernstein Index: Bloomberg US Treasury Index                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Bloomberg U.S. Treasury Index                      
Account Value $ 10,858 10,795 10,375 11,852 12,134 11,235 10,514 10,424 10,189 10,084   10,000
AllianceBernstein Index: Blended Benchmark: 60% MSCI World Index (net, USD hedged)/40% Bloomberg Global G7 Treasury Index (US                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Blended Benchmark: 60% MSCI World Index (net, USD hedged)/40% Bloomberg Global G7 Treasury Index (USD hedged)                      
Account Value $ 19,561 17,261 14,784 17,104 15,091 13,546 11,328 11,655 10,402 9,691 $ 10,000  
AllianceBernstein Index: Bloomberge US Aggregate Bond Index                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Bloomberg U.S. Aggregate Bond Index                      
Account Value $ 11,432 11,291 10,699 12,299 12,492 11,620 10,688 10,687 10,321 10,055   10,000
AllianceBernstein Index: Bloomberge US Aggregate Bond Index                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Bloomberg U.S. Aggregate Bond Index                      
Account Value $ 11,432 11,291 10,699 12,299 12,492 11,620 10,688 10,687 10,321 10,055   10,000
AllianceBernstein Index: Russell 1000 Value Index                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Russell 1000 Value Index                      
Account Value $ 22,580 19,743 17,713 19,157 15,306 14,890 11,767 12,827 11,285 9,617   10,000
AllianceBernstein Index: Russell 1000 Value Index                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Russell 1000 Value Index                      
Account Value $ 22,580 19,743 17,713 19,157 15,306 14,890 11,767 12,827 11,285 9,617   10,000
AllianceBernstein Index: Russell 1000 Growth Index                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Russell 1000 Growth Index                      
Account Value $ 47,152 35,358 24,782 34,971 27,408 19,790 14,510 14,733 11,314 10,567   10,000
AllianceBernstein Index: Russell 1000 Growth Index                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Russell 1000 Growth Index                      
Account Value $ 47,152 35,358 24,782 34,971 27,408 19,790 14,510 14,733 11,314 10,567   10,000
AllianceBernstein Index: Russell 2000 Growth Index                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Russell 2000 Growth Index                      
Account Value $ 21,772 18,906 15,933 21,636 21,040 15,628 12,163 13,411 10,978 9,862   10,000
AllianceBernstein Index: Russell 2000 Growth Index                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Russell 2000 Growth Index                      
Account Value $ 21,772 18,906 15,933 21,636 21,040 15,628 12,163 13,411 10,978 9,862   10,000
AllianceBernstein Index: Russell 2500 Value Index                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Russell 2500 Value Index                      
Account Value $ 21,204 19,105 16,473 18,953 14,832 14,142 11,445 13,059 11,833 9,451   10,000
AllianceBernstein Index: Russell 2500 Value Index                        
Account Value [Line Items]                        
Line Graph and Table Measure Name Russell 2500 Value Index                      
Account Value $ 21,204 $ 19,105 $ 16,473 $ 18,953 $ 14,832 $ 14,142 $ 11,445 $ 13,059 $ 11,833 $ 9,451   $ 10,000