Commitments and Contingencies	12 Months Ended
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal and regulatory matters described below pertain to AB and are included here due to their potential significance to AB Holding’s investment in AB. With respect to all significant litigation matters, we consider the likelihood of a negative outcome. If we determine the likelihood of a negative outcome is probable and the amount of the loss can be reasonably estimated, we record an estimated loss for the expected outcome of the litigation. If the likelihood of a negative outcome is reasonably possible and we are able to determine an estimate of the possible loss or range of loss in excess of amounts already accrued, if any, we disclose that fact together with the estimate of the possible loss or range of loss. However, it is often difficult to predict the outcome or estimate a possible loss or range of loss because litigation is subject to inherent uncertainties, particularly when plaintiffs allege substantial or indeterminate damages. Such is also the case when the litigation is in its early stages or when the litigation is highly complex or broad in scope. In these cases, we disclose that we are unable to predict the outcome or estimate a possible loss or range of loss. During the first quarter of 2012, AB received a legal letter of claim (the “Letter of Claim”) sent on behalf of Philips Pension Trustees Limited and Philips Electronic U.K. Limited (“Philips”), a former pension fund client, alleging that AllianceBernstein Limited (one of AB’s subsidiaries organized in the U.K.) was negligent and failed to meet certain applicable standards of care with respect to the initial investment in, and management of, a £500 million portfolio of U.S. mortgage-backed securities. Philips alleged damages ranging between $177 million and $234 million, plus compound interest on an alleged $125 million of realized losses in the portfolio. On January 2, 2014, Philips filed a claim form in the High Court of Justice in London, England, which formally commenced litigation with respect to the allegations in the Letter of Claim. By agreement dated November 28, 2016, the terms of which are confidential, this matter was settled. Our contribution to the settlement amount was paid by our relevant insurance carriers. In addition to the matter discussed immediately above, AB may be involved in various other matters, including regulatory inquiries, administrative proceedings and litigation, some of which may allege significant damages. In the opinion of AB’s management, an adequate accrual has been made as of December 31, 2016 to provide for any probable losses regarding any litigation matters for which management can reasonably estimate an amount of loss. It is reasonably possible that AB could incur additional losses pertaining to these matters, but currently management cannot estimate any such additional losses. Management, after consultation with legal counsel, currently believes that the outcome of any individual matter that is pending or threatened, or all of them combined, will not have a material adverse effect on our results of operations, financial condition or liquidity. However, any inquiry, proceeding or litigation has the element of uncertainty; management cannot determine whether further developments relating to any individual matter that is pending or threatened, or all of them combined, will have a material adverse effect on our results of operations, financial condition or liquidity in any future reporting period.

Commitments and Contingencies

Legal and regulatory matters described below pertain to AB and are included here due to their potential significance to AB Holding’s investment in AB.

With respect to all significant litigation matters, we consider the likelihood of a negative outcome. If we determine the likelihood of a negative outcome is probable and the amount of the loss can be reasonably estimated, we record an estimated loss for the expected outcome of the litigation. If the likelihood of a negative outcome is reasonably possible and we are able to determine an estimate of the possible loss or range of loss in excess of amounts already accrued, if any, we disclose that fact together with the estimate of the possible loss or range of loss. However, it is often difficult to predict the outcome or estimate a possible loss or range of loss because litigation is subject to inherent uncertainties, particularly when plaintiffs allege substantial or indeterminate damages. Such is also the case when the litigation is in its early stages or when the litigation is highly complex or broad in scope. In these cases, we disclose that we are unable to predict the outcome or estimate a possible loss or range of loss.

During the first quarter of 2012, AB received a legal letter of claim (the “Letter of Claim”) sent on behalf of Philips Pension Trustees Limited and Philips Electronic U.K. Limited (“Philips”), a former pension fund client, alleging that AllianceBernstein Limited (one of AB’s subsidiaries organized in the U.K.) was negligent and failed to meet certain applicable standards of care with respect to the initial investment in, and management of, a £500 million portfolio of U.S. mortgage-backed securities. Philips alleged damages ranging between $177 million and $234 million, plus compound interest on an alleged $125 million of realized losses in the portfolio. On January 2, 2014, Philips filed a claim form in the High Court of Justice in London, England, which formally commenced litigation with respect to the allegations in the Letter of Claim.

By agreement dated November 28, 2016, the terms of which are confidential, this matter was settled. Our contribution to the settlement amount was paid by our relevant insurance carriers.

In addition to the matter discussed immediately above, AB may be involved in various other matters, including regulatory inquiries, administrative proceedings and litigation, some of which may allege significant damages.

In the opinion of AB’s management, an adequate accrual has been made as of December 31, 2016 to provide for any probable losses regarding any litigation matters for which management can reasonably estimate an amount of loss. It is reasonably possible that AB could incur additional losses pertaining to these matters, but currently management cannot estimate any such additional losses.

Management, after consultation with legal counsel, currently believes that the outcome of any individual matter that is pending or threatened, or all of them combined, will not have a material adverse effect on our results of operations, financial condition or liquidity. However, any inquiry, proceeding or litigation has the element of uncertainty; management cannot determine whether further developments relating to any individual matter that is pending or threatened, or all of them combined, will have a material adverse effect on our results of operations, financial condition or liquidity in any future reporting period.