|
Short-Term Investments (Details) (USD $)
In Millions, unless otherwise specified
|
Sep. 30, 2014
|
| Short-term Investments [Abstract] |
|
| Available-for-sale securities,due in one year or less, fair value |
$ 198 |
| Held-to-maturity securities, due in one year or less, fair value |
479 |
| Available-for-sale securities, due after one year through three years, fair value |
900 |
| Held-to-maturity securities, due after one year through three years, fair value |
0 |
| Available-for-sale securities, due after three years through five years, fair value |
199 |
| Held-to-maturity securities, due after three years through five years, fair value |
0 |
| Available-for-sale securities, due after five years, fair value |
76 |
| Held-to-maturity securities, due after five years, fair value |
0 |
| Available-for-sale securities, total |
1,373 |
| Held-to-maturity securities, total |
$ 479 |