CD4017BE IC datasheet confusion
The max Clock current is ±10mA, as that is the maximum input current on any input pin. The max Clock Voltage is VDD + 0.5V.

The max VDD current is not given in current, but power. It is 500 mW for the package.  Individual output transistor power is limited to 100 mW or ±6.8 mA Typical at 25˚C. So max you should source for the whole IC is less than 68 mA.