Variable Rate Instruments [Member] Other Repurchase Agreements and Repurchase Agreements [Member] Bank Notes [Member] Certificates of Deposit [Member] Repurchase Agreements [Member] US Government Corporations and Agencies Securities [Member] US Treasury Securities [Member] Commercial Paper [Member] Ninety One To 180 Days [Member] One Eighty One Days or more [Member] One hundred eighty one Days or More [Member] One To 7 Days [Member] Eight To 30 Days [Member] Thirty One To 90 Days [Member] C000158659 [Member] Class A Shares C000158661 [Member] Class C Shares C000158662 [Member] Class F Shares C000026050 [Member] Class P Shares C000026082 [Member] Composite Class C000158663 [Member] Automated Shares C000026063 [Member] Institutional Shares C000026064 [Member] Service Shares Investment Type [Axis] Net Assets Investment Company Portfolio Turnover No Trading Symbol Flag