Consolidated Statements of Income (Parenthetical) (USD $) In Millions | 3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | |
| Consolidated Statements of Income | ||||
| Tax Expense included in Income (Loss) from Discontinued Operations | $ 1 | $ 5 | ||