assets and gross liabilities after collateral, were $1 million as of December 31, 2024. Our derivative liabilities, net of gross assets and gross liabilities after collateral, were $0 million as of December 31, 2024. The collateral posted to AIGM was $0 million as of December 31, 2024. The collateral held by us was $21 million as of December 31, 2024.
The suite of capital markets services previously provided by AIGM are now provided by our consolidated subsidiary CRBGM. The majority of transactions previously outstanding with AIGM have been legally transferred to CRBGM as of December 31, 2023.
In addition, we entered into certain unsecured derivative transactions with AIG prior to 2018. On May 4, 2023, these previously unsecured derivative transactions became fully collateralized. These derivative assets, net of gross assets and gross liabilities after collateral, were $0 million as of December 31, 2023. There were no derivative net liabilities as of December 31, 2024. There was no collateral posted to AIG or held by us as of December 31, 2024.
Tax Sharing Agreements
Prior to the IPO, we were included in the consolidated federal income tax return of AIG as well as certain state tax returns where AIG files on a combined or unitary basis. As described above, under the Tax Matters Agreement, we and AIG agreed to make payments to each other in respect of historic tax periods and tax periods prior to our deconsolidation from AIG for purposes of the applicable tax, determined in a manner consistent with our pre-existing tax sharing agreements with AIG.
For the year ended December 31, 2024, we received a net amount of $0 million in tax sharing payments in cash from AIG. The tax sharing payments may be subject to further adjustment in future periods. Amounts payable to AIG pursuant to the tax sharing agreements were $364 million as of December 31, 2024.
General Operating Services
Pursuant to the provisions of a service and expense agreement effective February 1, 1974 and the Transition Services Agreement, AIG provides operational services to us. For further information regarding these services, see Note 23 to our Audited Consolidated Financial Statements. The total service expenses incurred by us pursuant to these agreements were $43 million for the year ended December 31, 2024.
Historically, we have provided policy administration services to, and have received policy administration services from, previously affiliated AIG entities in connection with policies subject to the Fortitude Re transactions. For additional information with respect to these transactions, see Notes 1, 7 and 23 to our Audited Consolidated Financial Statements.
Advisory Transactions
Several of our asset management subsidiaries have served as investment managers or sub-managers, investment advisors or sub-advisors and portfolio managers or sub-managers for various funds pertaining to the asset management subsidiaries of AIG. The amount of fees we receive depends, in part, on the performance of the funds or the returns earned on the accounts which our subsidiaries are advising.
Certain of our investment management subsidiaries provide advisory, management, allocation, structuring, planning, oversight, administration and similar services (collectively, “Investment Services”) with respect to the investment portfolios of related party clients, including both insurance companies and non-insurance company subsidiaries of AIG. For additional information with respect to these Investment Services, see Note 23 to our Audited Consolidated Financial Statements. Management and advisory fee income for these Investment Services and related services was $17 million for the year ended December 31, 2024.