Apple iCloud Keychain

Only on a computer/device. The information isn't available at iCloud.com.

As Eric Root indicated, iCloud Keychain data cannot be accessed when you log in to your account at iCloud.com

According to Apple:

iCloud Keychain

• iCloud Keychain encryption keys are created on your devices, and Apple can't access those keys. Only encrypted keychain data passes through Apple's servers, and Apple can't access any of the key material that could be used to decrypt that data.
• Apple can't see or access the contents of your iCloud Keychain.
• Only trusted devices that you approved can access your iCloud Keychain.
• Advanced settings allow you to choose an iCloud Security Code longer than four digits or have your device generate one for you.
• You can choose to disable keychain recovery, which means that iCloud Keychain is kept up to date across your approved devices, but the encrypted data is not stored with Apple and cannot be recovered if all of your devices are lost.

For more information about iCloud Security and Privacy

iCloud security and privacy overview - Apple Support