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Employee Benefits (Details 4) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Retirement Plans [Member]
 
Information about the expected cash flows for retirement and post-retirement plans and impact of the Medicare subsidy  
2014, Net payments $ 76
2015, Net payments 79
2016, Net payments 84
2017, Net payments 88
2018, Net payments 92
2019-2023, Net payments 512
Postretirement Plans [Member]
 
Information about the expected cash flows for retirement and post-retirement plans and impact of the Medicare subsidy  
2014, Gross payments 14
2015, Gross payments 14
2016, Gross payments 15
2017, Gross payments 15
2018, Gross payments 15
2019-2023, Gross payments 79
2014, Retiree Contributions (5)
2015, Retiree Contributions (5)
2016, Retiree Contributions (6)
2017, Retiree Contributions (6)
2018, Retiree Contributions (7)
2019-2023, Retiree Contributions (44)
2014, Medicare subsidy (1)
2015, Medicare subsidy (1)
2016, Medicare subsidy (1)
2017, Medicare subsidy (1)
2018, Medicare subsidy (1)
2019-2023, Medicare subsidy (3)
2014, Net payments 8
2015, Net payments 8
2016, Net payments 8
2017, Net payments 8
2018, Net payments 7
2019-2023, Net payments $ 32