The broad indication of a bear phase is considered to be a reduction by 20%, which would equate to SPX trading below 1700 and DJIA below 14400. Interestingly enough DJIA's previous ath was registered at 14k, so IMHO that's where we are heading to, that also means that SPX would overshoot it's 200 day SMA (the way it stands currently at 1780). Whatever happens there depends on a lot of things.