Other Liabilities (Details 1) - USD ($) $ in Millions |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Carrying amount of deferred charge card and other fees | ||
| Deferred card and other fees | $ 1,767 | $ 1,652 |
| Deferred direct acquisition costs | (204) | (173) |
| Reserves for membership cancellations | (152) | (136) |
| Total | $ 1,411 | $ 1,343 |