Retirement Benefits (Fair Values Of Company's Other Postretirement Benefit Plan Assets) (Details) (Other Postretirement Benefit Plans [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 239	$ 211	$ 205
Money Market Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	9
Unitized Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	235	202
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	9
Level 1 [Member] | Money Market Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	9
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	235	202
Level 2 [Member] | Unitized Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	235	202
AA [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	239	211	205
AA [Member] | Money Market Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	9
AA [Member] | Unitized Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	235	202
AA [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	9
AA [Member] | Level 1 [Member] | Money Market Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	9
AA [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	235	202
AA [Member] | Level 2 [Member] | Unitized Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 235	$ 202