Retirement Benefits (Changes In Fair Value Measurements Of Level 3 Investments) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended					12 Months Ended
	Dec. 31, 2013 Private Equity Partnerships [Member]	Dec. 31, 2012 Private Equity Partnerships [Member]	Dec. 31, 2013 Insurance Group Annuity Contracts [Member]	Dec. 31, 2012 Insurance Group Annuity Contracts [Member]	Dec. 31, 2011 Insurance Group Annuity Contracts [Member]	Dec. 31, 2013 AA [Member] Private Equity Partnerships [Member]	Dec. 31, 2012 AA [Member] Private Equity Partnerships [Member]	Dec. 31, 2013 AA [Member] Insurance Group Annuity Contracts [Member]	Dec. 31, 2012 AA [Member] Insurance Group Annuity Contracts [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at January 1	$ 914	$ 920	$ 2	$ 2	$ 2	$ 914	$ 920	$ 2	$ 2
Relating to assets still held at the reporting date	(21)	20				(21)	20
Relating to assets sold during the period	99	102				99	102
Purchases	85	96				85	96
Sales	(229)	224				229	(224)	0
Fair value of plan assets at December 31	$ 848	$ 914	$ 2	$ 2	$ 2	$ 848	$ 914	$ 2	$ 2