Stockholders’ Equity - Noncontrolling Ownership Interest (Details) - shares	Sep. 30, 2025	Dec. 31, 2024
Bakkt Opco Holdings, LLC
Noncontrolling Interest [Line Items]
Ownership percentage, Total Opco common units outstanding	100.00%	100.00%
Bakkt Opco Holdings, LLC
Noncontrolling Interest [Line Items]
Opco Common Units (in shares)	23,641,070	13,689,188
Class A Common Stock | Bakkt Opco Holdings, LLC
Noncontrolling Interest [Line Items]
Ownership percentage, Opco common units held by Bakkt Holdings, Inc.	70.00%	48.00%
Class A Common Stock | Bakkt Opco Holdings, LLC
Noncontrolling Interest [Line Items]
Opco Common Units (in shares)	16,466,495	6,510,885
Class V Common Stock | Bakkt Opco Holdings, LLC
Noncontrolling Interest [Line Items]
Ownership percentage, Opco common units held by noncontrolling interest holders	30.00%	52.00%
Class V Common Stock | Bakkt Opco Holdings, LLC
Noncontrolling Interest [Line Items]
Opco Common Units (in shares)	7,174,575	7,178,303