| Activity in Bitcoin [Table Text Block] |
| Three Months Ended June 30, 2025 | | Quantity | | | Cost | | | Fair Value | | | Realized
Gain (Loss) | |
| Beginning balance | | | 576,038 | | | $ | 40,686,575,306 | | | $ | 47,785,797,093 | | | $ | — | |
| Bitcoin purchased | | | 133,790 | | | | 13,633,363,295 | | | | 13,633,363,295 | | | | — | |
| Bitcoin sold for the redemption of shares | | | (12,590 | ) | | | (917,399,868 | ) | | | (1,171,783,539 | ) | | | 254,383,671 | |
| Bitcoin sold to pay expenses | | | (363 | ) | | | (26,420,452 | ) | | | (34,107,971 | ) | | | 7,687,519 | |
| Net realized gain | | | — | | | | — | | | | 262,071,190 | | | | — | |
| Net change in unrealized appreciation/depreciation | | | — | | | | — | | | | 14,244,730,958 | | | | — | |
| Ending balance | | | 696,875 | | | $ | 53,376,118,281 | | | $ | 74,720,071,026 | | | $ | 262,071,190 | |
| Three Months Ended June 30, 2024 | | Quantity | | | Cost | | | Fair Value | | | Realized
Gain (Loss) | |
| Beginning balance | | | 252,011 | | | $ | 13,984,500,952 | | | $ | 17,791,246,945 | | | $ | — | |
| Bitcoin purchased | | | 55,736 | | | | 3,807,994,861 | | | | 3,807,994,861 | | | | — | |
| Bitcoin sold for the redemption of shares | | | (640 | ) | | | (36,148,475 | ) | | | (37,021,363 | ) | | | 872,888 | |
| Bitcoin sold to pay expenses | | | (128 | ) | | | (7,281,748 | ) | | | (8,636,353 | ) | | | 1,354,605 | |
| Net realized gain | | | — | | | | — | | | | 2,227,493 | | | | — | |
| Net change in unrealized appreciation/depreciation | | | — | | | | — | | | | (2,102,796,450 | ) | | | — | |
| Ending balance | | | 306,979 | | | $ | 17,749,065,590 | | | $ | 19,453,015,133 | | | $ | 2,227,493 | |
| Six Months Ended June 30, 2025 | | Quantity | | | Cost | | | Fair Value | | | Realized
Gain (Loss) | |
| Beginning balance | | | 551,918 | | | $ | 37,372,942,571 | | | $ | 51,530,013,513 | | | $ | — | |
| Bitcoin purchased | | | 190,888 | | | | 19,246,756,195 | | | | 19,246,756,195 | | | | — | |
| Bitcoin sold for the redemption of shares | | | (45,218 | ) | | | (3,192,791,619 | ) | | | (4,071,574,578 | ) | | | 878,782,959 | |
| Bitcoin sold to pay expenses | | | (713 | ) | | | (50,788,866 | ) | | | (66,916,943 | ) | | | 16,128,077 | |
| Net realized gain | | | — | | | | — | | | | 894,911,036 | | | | — | |
| Net change in unrealized appreciation/depreciation | | | — | | | | — | | | | 7,186,881,803 | | | | — | |
| Ending balance | | | 696,875 | | | $ | 53,376,118,281 | | | $ | 74,720,071,026 | | | $ | 894,911,036 | |
| Six Months Ended June 30, 2024 | | Quantity | | | Cost | | | Fair Value | | | Realized
Gain (Loss) | |
| Beginning balance | | | — | | | $ | — | | | $ | — | | | $ | — | |
| Bitcoin purchased | | | 307,752 | | | | 17,792,752,818 | | | | 17,792,752,818 | | | | — | |
| Bitcoin sold for the redemption of shares | | | (640 | ) | | | (36,148,475 | ) | | | (37,021,363 | ) | | | 872,888 | |
| Bitcoin sold to pay expenses | | | (133 | ) | | | (7,538,753 | ) | | | (8,993,883 | ) | | | 1,455,130 | |
| Net realized gain | | | — | | | | — | | | | 2,328,018 | | | | — | |
| Net change in unrealized appreciation/depreciation | | | — | | | | — | | | | 1,703,949,543 | | | | — | |
| Ending balance | | | 306,979 | | | $ | 17,749,065,590 | | | $ | 19,453,015,133 | | | $ | 2,328,018 | |
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