Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis) (Details) (USD $) In Millions | Sep. 30, 2010 | Jun. 30, 2010 |
|---|---|---|
| Assets held for sale, carrying value | $ 11 | |
| Gains (Losses) | (4) | |
Fair Value, Inputs, Level 1 [Member] | ||
| Assets held for sale | ||
Fair Value, Inputs, Level 2 [Member] | ||
| Assets held for sale | ||
Fair Value, Inputs, Level 3 [Member] | ||
| Assets held for sale | $ 7 |