How do you make TurboTax understand that Social Security and Canada Pension Plan benefits paid to Canadian residents aren't taxed by the U.S.?

The "best" answer so far is to take a tax credit, which is cumbersome and misses the point. The U.S. does not tax these benefits, period, regardless of how much foreign tax is paid. A Canadian residence should be sufficient for TurboTax to consider the payments non-taxable on a U.S. return. Is there any place in TurboTax to specify the non-taxable portion (in this case 100%), as is done for RRSPs?