Retirement Benefits (Changes In The Fair Value Of Plan Assets Classified As Level 3) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Real estate
Change in plan assets:
Fair value of plan assets at beginning of year	$ 118	$ 108
Actual Return on Plan Assets Related to Assets Still Held at the Reporting Date	9	7
Purchases, Sales and Settlements, net	4	3
Fair value of plan assets at end of year	131	118
Private equity
Change in plan assets:
Fair value of plan assets at beginning of year	19	23
Actual Return on Plan Assets Related to Assets Still Held at the Reporting Date	(9)	(7)
Actual Return on Plan Assets Related to Assets Sold During the Period	11	8
Purchases, Sales and Settlements, net	(6)	(5)
Fair value of plan assets at end of year	$ 15	$ 19