Postretirement Plans (Narrative) (Details) (Pension Plans, Defined Benefit [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended				3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 defined benefit plan changes [Member] employee
Defined Benefit Plan Disclosure [Line Items]
Union and nonunion participants transitioned to defined contribution plan							100,000
Pension Curtailment charge	$ 35	$ 84	$ 372	$ 104			$ 334
Pension Benefit Plans, Net Actuarial Gain, before Tax recorded in Other Comprehensive Income							966
Defined Benefit Plan Curtailment							1,988
Defined Benefit Plan, Net Actuarial Gain (Loss)							$ 1,022
Defined Benefit Plan, Benefit Obligation Discount Rate					4.50%	4.80%