Hi everyone. I tried to sweep about 20 mbtc from my blockchain.info wallet to electrum, but when trying to sweep, electrum showed I would receive only 16 mbtc. The 20 mbtc is the total balance I have in blockchain.info wallet. I wanted to sweep the entire amount. I didn't go through with the transaction though as I'm not sure why I would be receiving much less than my entire balance. I'm using the latest Electrum 3.0 wallet. By the way, I'm a newbie, and would appreciate less bitcoin jargons. 
Can anyone help me understand this and give me some tips. Thanks in advance for your help.
Can anyone help me understand this and give me some tips. Thanks in advance for your help. When you want to sweep your private keys in Electrum it is like you send them in transaction,only difference is that you give Electrum option to send transaction for you from one or more private keys in single transaction.In this way your BTC will be send to a new generated address in Electrum but for that you need to pay fee.The difference you see in your blockchain wallet and final balance in Electrum is fee you need to pay for sweep.
You have option to continue with sweep,to send BTC direct from blockchain to your new address in Electrum(I think blockchain wallet allow manual fee)or you can import private keys in Electrum and not pay fee.But if you import private keys then they will not be included in your wallet protected by seed.For more info read Electrum FAQ : http://docs.electrum.org/en/latest/faq.html
