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Retirement Plans (Schedule Of Expense Related To These Defined Contribution Plans) (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2011
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Dec. 31, 2010
|
Dec. 31, 2009
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| Defined Benefit Plan Disclosure [Line Items] | |||
| Expense related to defined contribution plans | $ 54 | $ 49 | $ 49 |
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401 (k) Plan [Member]
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|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Expense related to defined contribution plans | 33 | 32 | 34 |
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Canadian Pension And Savings Plans [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Expense related to defined contribution plans | $ 21 | $ 17 | $ 15 |