Summary of Significant Accounting Policies - Restricted Assets (Details) - USD ($) $ in Millions |
Jan. 30, 2016 |
Jan. 31, 2015 |
---|---|---|
Accounting Policies [Abstract] | ||
Restricted Cash and Investments | $ 185 | $ 292 |
Restricted Cash and Investments, Continuing Operations | 184 | |
Restricted Cash and Investments, Held-for-Sale | $ 108 |