|
Employee Benefits (Narrative) (Details) (USD $)
In Billions, unless otherwise specified |
3 Months Ended |
|---|---|
|
Mar. 31, 2012
|
|
| Defined Benefit Plan Disclosure [Line Items] | |
| Amount paid in severance benefits over the period | $ 0.1 |
| Postemployment benefits liability | 1 |
|
Qualified Pension Trusts [Member]
|
|
| Defined Benefit Plan Disclosure [Line Items] | |
| Defined benefit plan contributions by employer | 0.4 |
|
Nonqualified Pension Plans [Member]
|
|
| Defined Benefit Plan Disclosure [Line Items] | |
| Defined benefit plan contributions by employer | 0.1 |
|
Other Postretirement Benefit Plans [Member]
|
|
| Defined Benefit Plan Disclosure [Line Items] | |
| Defined benefit plan contributions by employer | $ 0.4 |