The amount of assets held for sale which it is highly probable that its carrying amount will be recovered through a sale transaction rather than through continuing use and the asset (or disposal group) is available for sale in its present condition.

No definition available.

Name:	znh_AssetHeldForSaleCurrent
Namespace Prefix:	znh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Asset Held For Sale - Summary of Assets Held for Sale (Detail) - CNY (¥) ¥ in Millions	Dec. 31, 2019	Dec. 31, 2018
Assets held for sale [line items]
Assets held for sale		¥ 224
Owned aircraft [member]
Assets held for sale [line items]
Assets held for sale		¥ 224