Long-Term Incentive Compensation Plans - Summary of Changes in Unvested Restricted AB Holding Units (Details) - Restricted Stock Units (RSUs)	12 Months Ended
	Dec. 31, 2023 $ / shares shares
AB Holding Units
Unvested, beginning balance (in shares) | shares	14,772,236
Granted (in shares) | shares	5,664,619
Vested (in shares) | shares	(6,598,656)
Forfeited (in shares) | shares	(390,644)
Unvested, ending balance (in shares) | shares	13,447,555
Weighted Average Grant Date Fair Value per AB Holding Unit
Unvested, Beginning Weighted Average Grant Date Fair Value per AB Holding Unit (in dollars per share) | $ / shares	$ 36.92
Granted, Weighted Average Grant Date Fair Value per AB Holding Unit (in dollars per share) | $ / shares	31.05
Vested, Weighted Average Grant Date Fair Value per AB Holding Unit (in dollars per share) | $ / shares	35.74
Forfeited, Weighted Average Grant Date Fair Value per AB Holding Unit (in dollars per share) | $ / shares	37.36
Unvested, Ending Weighted Average Grant Date Fair Value per AB Holding Unit (in dollars per share) | $ / shares	$ 35.02