Condensed Schedule Of Investments (Futures And Forward Currency Contracts) (Parenthetical) - Long Contracts [Member]	12 Months Ended
	Dec. 31, 2020 contract
2 Year U.S. Treasury Note [Member]
Summary of Investment Holdings [Line Items]
Investment Term	2 years
Contracts	71
Investment settlement date	Mar. 01, 2021
5 Year U.S. Treasury Note [Member]
Summary of Investment Holdings [Line Items]
Investment Term	5 years
Contracts	426
Investment settlement date	Mar. 01, 2021
10 Year U.S. Treasury Note [Member]
Summary of Investment Holdings [Line Items]
Investment Term	10 years
Contracts	351
Investment settlement date	Mar. 01, 2021
30 Year U.S. Treasury Bond [Member]
Summary of Investment Holdings [Line Items]
Investment Term	30 years
Contracts	99
Investment settlement date	Mar. 01, 2021