Concentration and Risks - Additional Information (Details) - CNY (¥) ¥ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2025	Dec. 31, 2024
Concentration and Risks
Cash, cash equivalents and restricted cash subject to currency conversion controls	¥ 12,099,603	¥ 19,902,484

The amount of cash, cash equivalents and restricted cash that is subject to governmental controls on the convertibility of currency.

No definition available.

Name:	nio_CashCashEquivalentsAndRestrictedCashSubjectToConvertibilityRestrictions
Namespace Prefix:	nio_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration