|
Retrospective Responsibility Plan Changes in the Escrow Account (Details) (USD $)
|
6 Months Ended | |
|---|---|---|
|
Mar. 31, 2015
|
Sep. 30, 2014
|
|
| Restricted Cash and Cash Equivalents Items [Line Items] | ||
| Restricted Cash and Cash Equivalents | $ 1,200,000,000 | $ 1,500,000,000 |
| Opt-out Merchants [Member] | ||
| Restricted Cash and Cash Equivalents Items [Line Items] | ||
| Payments to opt-out merchants | $ 321,000,000 |