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Pension and Other Postretirement Benefits (Details Textual)
$ in Millions
6 Months Ended
Jun. 30, 2015
USD ($)
Pension [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected current year contributions to benefit plans $ 100
Contributions to benefit plans 89
Other Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected current year contributions to benefit plans 5
Contributions to benefit plans $ 3