|
Retirement Plans (Schedule Of Changes In Level 3 Assets) (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2011
|
Dec. 31, 2010
|
Dec. 31, 2009
|
|
| Defined Benefit Plan Disclosure [Line Items] | |||
| Level 3 plan assets | $ 90 | $ 58 | $ 51 |
|
Investment Returns Of Hedge Funds [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Level 3 plan assets | (1) | 4 | |
|
Purchases Of Hedge Funds [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Level 3 plan assets | $ 33 | $ 3 | |