C000022342 [Member] Series NAV C000117966 [Member] Series II C000117965 [Member] Series I C000022375 [Member] C000022376 [Member] C000022374 [Member] Short term investments Quality [Member] Preferred securities [Member] Term loans [Member] Convertible bonds [Member] Foreign government obligations [Member] Other countries [Member] C000022418 [Member] C000022420 [Member] C000022419 [Member] Mortgage-Backed Securities, Issued by Private Enterprises [Member] Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] Asset-Backed Securities [Member] Short-Term Investments [Member] US Government Debt Securities [Member] Equity [Member] US Government Corporations and Agencies Securities [Member] Exchange Traded Funds [Member] Corporate Bond Securities [Member] UNITED STATES UNITED KINGDOM NEW ZEALAND MEXICO KOREA, REPUBLIC OF JAPAN INDONESIA CZECHIA COLOMBIA BRAZIL Moody's, Aaa Rating [Member] Standard & Poor's, AA Rating [Member] Standard & Poor's, A Rating [Member] C000022431 [Member] C000022432 [Member] C000022430 [Member] Short term investments and other [Member] US Government Debt Securities Quality [Member] US Government Corporations and Agencies Securities Quality [Member] Mortgage Backed Security Issued by US Government Sponsored Enterprise Quality [Member] Short term investments and other Quality [Member] Not rated [Member] CCC and below [Member] C000022446 [Member] C000022448 [Member] C000022447 [Member] Standard & Poor's, B Rating [Member] Standard & Poor's, BB Rating [Member] Standard & Poor's, BBB Rating [Member] Municipal Bonds [Member] C000022568 [Member] C000022569 [Member] C000022567 [Member] Sixty One To 90 Days [Member] Thirty One To 60 Days [Member] Over 90 Days [Member] Zero To 30 days [Member] C000022640 [Member] C000022642 [Member] C000022641 [Member] Repurchase Agreements [Member] C000022740 [Member] C000022741 [Member] C000022739 [Member] C000073237 [Member] C000073239 [Member] C000073238 [Member] C000078286 [Member] C000078287 [Member] C000078285 [Member] C000090651 [Member] C000090650 [Member] C000090649 [Member] Investment Type [Axis] Net Assets Investment Company Portfolio Turnover No Trading Symbol Flag