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Benefit Obligations (Schedule of Pension Benefits Expected to be Paid from the Plans or From the Company's Assets) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Pension Benefits [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
2012 $ 235 [1]
2013 233 [1]
2014 234 [1]
2015 234 [1]
2016 237 [1]
2017-2021 1,228 [1]
Postretirement Benefits [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
2012 58
2013 59
2014 60
2015 61
2016 60
2017-2021 289
2012 6
2013 6
2014 3
2015 2
2016 2
2017-2021 $ 8
[1] Payments are expected to be made primarily from plan assets.