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No definition available.

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SHORT-TERM AND LONG-TERM DEBT - Pre-Capitalized Trust Securities and AB Commercial Paper Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Jun. 30, 2024	Jun. 06, 2024
Senior Note (4.572% due 2029) \| Senior Notes
Debt Instrument [Line Items]
Principal amount issued			$ 600,000,000	$ 600,000,000
Debt instrument, stated percentage	4.572%		4.572%
AB commercial paper \| AB commercial paper
Debt Instrument [Line Items]
Short-term debt	$ 0	$ 254,000,000
Debt instrument, stated percentage		5.40%
Average outstanding balance	$ 268,000,000	$ 268,000,000
Weighted average interest rate over period	5.40%	5.20%