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Employee Benefits (Details 4) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012
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Retirement Plans [Member] |  |
Information about the expected cash flows for retirement and post-retirement plans and impact of the Medicare subsidy |  |
2013, Net payments | $ 72 | [1]
2014, Net payments | 75 | [1]
2015, Net payments | 78 | [1]
2016, Net payments | 82 | [1]
2017, Net payments | 86 | [1]
2018-2022, Net payments | 484 | [1]
Postretirement Plans [Member] |  |
Information about the expected cash flows for retirement and post-retirement plans and impact of the Medicare subsidy |  |
2013, Gross payments | 19 | [2]
2014, Gross payments | 21 | [2]
2015, Gross payments | 22 | [2]
2016, Gross payments | 24 | [2]
2017, Gross payments | 25 | [2]
2018-2022, Gross payments | 151 | [2]
2013, Retiree Contributions | (7) | [2]
2014, Retiree Contributions | (8) | [2]
2015, Retiree Contributions | (10) | [2]
2016, Retiree Contributions | (12) | [2]
2017, Retiree Contributions | (14) | [2]
2018-2022, Retiree Contributions | (98) | [2]
2013, Medicare subsidy | (1) | [2]
2014, Medicare subsidy | (1) | [2]
2015, Medicare subsidy | (1) | [2]
2016, Medicare subsidy | (1) | [2]
2017, Medicare subsidy | (1) | [2]
2018-2022, Medicare subsidy | (3) | [2]
2013, Net payments | 11 | [2]
2014, Net payments | 12 | [2]
2015, Net payments | 11 | [2]
2016, Net payments | 11 | [2]
2017, Net payments | 10 | [2]
2018-2022, Net payments | $ 50 | [2]
[1] | Reflects the total benefits expected to be paid from the plans or from our assets including both our share of the benefit cost and the participants’ share of the cost.
[2] | Reflects the total benefits expected to be paid from our assets.

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