Retirement Benefits (Schedule Of One Percentage Point Change In Assumed Health Care Cost Trend Rates) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Impact on 2013 service and interest cost, One Percent Increase	$ 3
Impact on service and interest cost, One Percent Decrease	(3)
Impact on postretirement benefit obligation as of December 31, One Percent Increase	65
Impact on postretirement benefit obligation as of December 31, One Percent Decrease	(64)
AA [Member]
Defined Benefit Plan Disclosure [Line Items]
Impact on 2013 service and interest cost, One Percent Increase	2
Impact on service and interest cost, One Percent Decrease	2
Impact on postretirement benefit obligation as of December 31, One Percent Increase	50
Impact on postretirement benefit obligation as of December 31, One Percent Decrease	$ 53